MSA8R33270R [CDE]

CAPACITOR, ALUMINUM ELECTROLYTIC, NON SOLID, NON-POLARIZED, 270uF, CHASSIS MOUNT, RADIAL LEADED, CAN;
MSA8R33270R
型号: MSA8R33270R
厂家: CORNELL DUBILIER ELECTRONICS    CORNELL DUBILIER ELECTRONICS
描述:

CAPACITOR, ALUMINUM ELECTROLYTIC, NON SOLID, NON-POLARIZED, 270uF, CHASSIS MOUNT, RADIAL LEADED, CAN

电容器
文件: 总8页 (文件大小:137K)
中文:  中文翻译
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TYPE MS  
ELECTROLYTIC  
AC MOTOR START CAPACITORS  
FEATURES:  
Moisture & Oil Resistant Plastic Case  
Compact Size  
Easily Mounted  
HIGH LIGHTS:  
Capacitance:  
Voltage:  
Operating Frequency:  
Power Factor:  
21 - 1590 Mfd  
110 Vac - 330 Vac  
50 - 60 Hz  
Long Life and High Reliability  
10% Max.  
Ambient Temperature: -40gC +65gC  
Case Sizes:  
1-7/16" x 2-3/4" to  
2-9/16" x 4-3/8"  
APPLICATIONS:  
Motor Starting and other  
Intermittent AC applications  
Made In U.S.A.  
The MS motor start aluminum electrolytic  
capacitor is used to provide the torque  
necessary to start AC motors and can be  
used in other intermittent AC applications.  
The capacitor comes in all popular styles  
with a variety of terminal configuration  
choices. NACC Motor Start Capacitors are  
designed in accordance with EIA RS-463.  
Mallory Products for CDE  
6325 Digital Way  
Indianapolis, Indiana 46278  
Phone: (317) 275-2285  
Fax: (317) 275-2293  
Internet: http://www.cornell-dubilier.com  
Type MS  
Standard Terminal Layouts & Resistor Layout  
* NEMA Standard Sizes  
Resistors - Resistors are available at extra cost in  
L
C
(Ref.)  
Case  
Code  
D
ratings specified. Layout as shown below is manda-  
tory on case diameter 1-7/16" (case # 1-2-3) but other  
positioning is possible on larger sizes. ( *Standard)  
(+0.020, -0.030)  
(Ȁ0.015)  
1
1
1
5
5
7
7
7
1
* 2  
3
* 4  
* 5  
6
1-7/16 (1.4375)  
1-7/16 (1.4375)  
1-7/16 (1.4375)  
1-13/16 (1.8125)  
1-13/16 (1.8125)  
2-1/16 (2.0625)  
2-1/16 (2.0625)  
2-9/16 (2.5625)  
2-3/4 (2.750)  
3-3/8 (3.375)  
4-3/8 (4.375)  
3-3/8 (3.375)  
4-3/8 (4.375)  
3-3/8 (3.375)  
4-3/8 (4.375)  
4-3/8 (4.375)  
/
/
/
/
/
/
/
/
(.500)  
2
2
2
8
8
8
8
8
Size  
(Max)  
(.500)  
(.500)  
(.625)  
(.625)  
(.875)  
(.875)  
(.875)  
Rating  
Tolerance  
4700 Ohms 1 Watt  
15000 Ohms 1 Watt  
5600 Ohms 2 Watt  
*15000 Ohms 2 Watt  
33000 Ohms 2 Watt  
10%  
10%  
10%  
10%  
10%  
1/4 x 3/4  
1/4 x 3/4  
5
5
5
/
/
/
16 x 3/4  
16 x 3/4  
16 x 3/4  
* 7  
8
.140 R  
.250  
.1875 Dia  
.095 Dia  
.250  
.094  
.250  
.106 Dia  
.156  
.094  
.109  
.094  
.160  
.285  
.154  
.154  
.406  
.281  
.281  
.333  
.250  
.385  
.365  
.365  
.266  
.130  
.070  
.100 Dia  
.070  
.100 Dia  
.100 Dia  
Standard  
Dual Disconnect Terminals  
W/Solder Lug Terminal  
(DQCS)  
Single Disconnect Terminals  
(SQC)  
Dual Disconnect Terminals  
(DQC)  
Solder Lug Terminals  
(SL)  
(All Cases)  
(All Cases)  
(All Cases)  
(Case 4, 5, 6, 7 & 8 only)  
.125  
(Ref)  
C
C
C
C
.0625  
(Ref)  
.0625  
(Ref)  
.0625  
(Ref)  
L
D
Part Number Nomenclature  
MS  
A
1
R
10  
161  
N
Standard Part Number  
NACC Type Designation  
Identifies the basic capacitor design;  
Performance  
A = EIA Type 2  
B = EIA Type 1  
Case Code  
(See standard ratings page)  
Case Type  
R = Recessed (Standard).  
Voltage Rating  
10 = 110  
22 = 220  
11 = 115  
25 = 250  
12 = 125  
33 = 330  
16 = 165  
Minimum Capacitance  
Expressed in microfarads.  
Always 3 or 4 digits.  
Resistor  
N = No resistor (Standard)  
R = With Resistor  
2
Mallory Products for CDE/6325 Digital Way/Indianapolis IN 46278/Phone: (317)275-2285/Fax: (317)275-2293  
Ratings Charts  
MSB Standard Ratings  
MSA Standard Ratings  
Normal Performance (EIA Type 2) Extra Performance (EIA Type 1)  
MFD  
110 Vac 115Vac 125 Vac 165Vac 220Vac 250Vac 330 Vac  
MFD  
110Vac 115Vac 125Vac 165Vac 220Vac 250Vac 330Vac  
21-25  
25-30  
1
1
1
1
1
1
1
1
2
2
2
2
1 or 2  
1 or 2  
1,2,3 or 4  
2 or 4  
3 or 4  
3 or 4  
3 or 5  
5
21-25  
25-30  
1
1
1
1
1
1
1
1 or 2  
1
1
1
1
1
1
1
1
1
2
30-36  
1
1
1
1
1
1
30-36  
1
1
1
1
1
1 or 2  
1 or 2  
3 or 4  
36-43  
1
1
1
1
36-43  
1
1
1
1
1 or 2  
3 or 4  
43-52  
1
1
1
1
1 or 2  
1 or 2  
43-52  
1
1
1
1
1 or 2 2,3 or 4  
1 or 2 2,3 or 4  
2,3 or 4 3 or 4  
4 or 5  
47-56  
1
1
1
1
47-56  
1
1
1
1
5
5
5
5
7
8
53-64  
1
1
1
1
1 or 2 2,3 or 4  
2,3 or 4 2,3 or 4  
53-64  
1
1
1
1
64-77  
1
1
1
1
64-77  
1
1
1
1
2,3 or 4  
4
72-87  
1
1
1
1
3 or 4  
3 or 4  
5
72-87  
1
1
1
1
3 or 4  
4
88-106  
108-130  
124-149  
130-156  
145-174  
161-193  
189-227  
216-260  
233-280  
243-292  
270-324  
324-389  
340-408  
378-455  
400-480  
430-516  
460-552  
540-648  
590-708  
645-774  
1
1
1
1 or 2  
2
3 or 4 3,4 or 5 5,6 or 7  
88-106  
108-130  
124-149  
130-156  
145-174  
161-193  
189-227  
216-260  
233-280  
243-292  
270-324  
324-389  
340-408  
378-455  
400-480  
430-516  
460-552  
540-648  
590-708  
710-850  
815-978  
1
1
1
1 or 2  
4
5
1
1
1
1
4
5
5
5 or 6  
5 or 6  
5 or 6  
7 or 8  
1
1
1
2
5
5
1
1
1
2
7 or 8  
1
1
1
1 or 2  
2
3 or 4  
5
7
1
1
2 or 3  
2 or 3  
2 or 3  
2 or 3  
3
7 or 8  
1
1
3 or 4  
5
7 or 8  
1
1
1
5,6 or 7 5,6 or 7  
7 or 8  
1
1
3 or 4  
7
8
8
8
8
1
1
1
5,6 or 7  
7
8
8
8
8
8
8
1
2
2 or 3  
2 or 3  
3 or 4  
3 or 4  
3 or 4  
4 or 5  
5
4
4
5
5
5
5
5
7
8
8
7 or 8  
1
1
2
7
7 or 8  
2
3 or 4  
7 or 8  
2
2
2
2
7 or 8  
7 or 8  
2 or 3  
3 or 4  
8
8
8
8
2
2
3 or 4  
3 or 4  
3 or 4  
4 or 5  
5
7 or 8  
8
8
8
8
8
8
8
8
2
2 or 4  
2 or 3  
2 or 3  
2 or 3  
3 or 4  
3 or 4  
3 or 4  
3 or 4  
3 or 4  
5
2
2 or 3  
2 or 3  
2 or 3  
3 or 4  
3 or 4  
3 or 4  
7 or 8  
3 or 4  
4
2
8
8
8
8
8
8
8
3 or 4  
4
3
3 or 4  
5
3
3 or 5  
5
5
3 or 4  
3 or 4  
3 or 4  
3 or 4  
4 or 5  
5
5,6 or 7  
5,6 or 7  
5
5
5
5
7
7
8
8
5
5
5 or 7  
5
3 or 4 5,6,7 or 8  
3 or 4 5,6,7 or 8  
7
7
7
7
7
4 or 5  
5 or 6  
7 or 8  
7 or 8  
8
5
7 or 8  
8
7
708-850 5,6 or 7 5,6 or 7 5,6 or 7  
7 or 8  
720-864  
800-960  
7
7
Capacitance ratings in other case sizes may be available.  
Contact NACC Application Engineer for assistance.  
815-978 5,6 or 7  
829-995  
7
7
8
8
8
850-1020 7 or 8  
900-1080 7 or 8  
7 or 8  
7 or 8  
7 or 8  
7 or 8  
1000-1200  
8
1020-224 7 or 8  
1175-1410 7 or 8  
7 or 8  
8
7 or 8  
7 or 8  
1280-1536  
1326-1590  
8
8
8
8
Diameter  
(Ȁ0.015)  
Length  
(+0.020, -0.030)  
Case  
Number  
1
* 2  
3
1-7/16 (1.4375)  
1-7/16 (1.4375)  
1-7/16 (1.4375)  
1-13/16 (1.8125)  
1-13/16 (1.8125)  
2-1/16 (2.0625)  
2-1/16 (2.0625)  
2-9/16 (2.5625)  
2-3/4 (2.750)  
3-3/8 (3.375)  
4-3/8 (4.375)  
3-3/8 (3.375)  
4-3/8 (4.375)  
3-3/8 (3.375)  
4-3/8 (4.375)  
4-3/8 (4.375)  
* 4  
* 5  
6
* 7  
8
* NEMA Standard Sizes  
3
Mallory Products for CDE/6325 Digital Way/Indianapolis IN 46278/Phone: (317)275-2285/Fax: (317)275-2293  
Mounting Accessories  
HB Bracket  
HB brackets are used with PL or PLA end caps. The bracket is  
assembled to the motor or any suitable surface by two screws in  
line at any convenient position within the center-to-center dimen-  
sion (C) shown in the chart.  
.2188 R  
.3125 R  
Material: .042 spring steel with black parkerized finish.  
.9375 Space  
D
Dimensions (Ref.)  
.750  
Catalog  
EIA  
Number Case Code  
A
B
C*  
D
.191 R  
.094  
1.375  
HB2  
HB4  
HB8  
1
3-3/8"  
4-1/64"  
5-1/64"  
1-11/64"  
1-13/16"  
2-23/32"  
7/8"  
1.258  
1-37/64"  
2-5/64"  
*C  
.234  
2-4-6  
3-5-7-8  
1-1/2"  
B
A
1-25/32"  
.875  
1.1875  
* Center-to-center dimension.  
PL and PLA End Caps  
When assembling directly to the motor frame, the wires are brought  
through the bracket hole and connected to the capacitor termi-  
nals. Type PL end cap is then placed in position and the entire  
assembly snapped into place. Off-motor mounting is similarly  
accomplished except that Type PLA caps should be used to pro-  
vide for leads emerging from the opposite side of the cap without  
going through the bracket hole.  
Catalog Number  
A
EIA  
Case Code  
Wire Hole  
Toward Bracket  
Wire Hole  
Away From Bracket  
Dimension  
PL3  
PL6  
PL8  
PL10  
PLA3  
PLA6  
PLA8  
PLA10  
1-2-3  
4-5  
6-7  
8
1-7/16  
1-13  
"
/
"
16  
2-1/16  
2-9/16  
"
"
End caps and brackets are shipped  
loose and should be separately  
ordered when required. Add 'A'  
to the PL part numbers if PLA cap  
is desired (Example: PLA3).  
.375  
.375  
A
A
PL  
PLA  
PLA  
PL  
.176 x .281  
(3 places)  
VR Brackets  
Type VR brackets are available for vertical mounting. They are  
supplied with clamping screws and nuts.  
A
.219  
C
Material is .035 thick 1010 CRS, commercial grade #4 temper  
ASI-scale. Parts are finished with .0001 (nominal) zinc chromate  
plating.  
A
B Mtg  
.375  
120g  
.156  
Dimensions (Ref.)  
B
Mtg.  
C
.500  
2 Holes  
.201 Dia  
Catalog  
Number  
EIA  
Case Code  
2 Holes  
.1561 Dia.  
A
B
C
.750  
1.125  
1-7/8"  
.562  
.750  
VR3  
VR6  
VR8  
VR10  
1-2-3  
4-5  
6-7  
8
1-3/8" to 1-7/16  
"
1-25  
/ "  
32  
1-3/4" to 1-13  
2" to 2-1/16  
2-1/2" to 2-9/16  
/
"
2-1/4"  
2-1/2"  
3"  
2-9/16  
2-13  
"
16  
"
"
/
"
16  
VR3  
3-5/16  
"
VR6-8-10  
Wire Leads  
Terminal Configurations:  
#10 Ring  
Insulated wire leads are available by special order.  
1/4" Quick Connect - Female Flag  
1/4" Quick Connect - Female In-Line  
Bare - Stripped and Tinned  
Specifications:  
Size:  
Insulation:  
#18 AWG x 10" long  
600V ; +105gC  
Other options and configurations available upon submission of  
customer drawing and/or specification.  
4
Mallory Products for CDE/6325 Digital Way/Indianapolis IN 46278/Phone: (317)275-2285/Fax: (317)275-2293  
Application Guide  
Figure A:Type 2 (MSA)  
1.1 VOLTAGE RATING  
t
(No. of  
Starts)  
Rated  
Voltage Test  
Volts AC (rms)  
Capacitance  
Rating (mfd)  
From  
Duty Cycle  
%
Duty  
Cycle  
The rated voltage of the capacitor must be greater than or equal to  
the average voltage across the capacitor terminals during the mo-  
tor starting cycle. This is not necessarily the same as the motor  
line voltage. In addition, the cutoff voltage rating of the capaci-  
tor must be greater than or equal to the maximum voltage attained  
Secs. Secs.  
To  
(On)  
(Off)  
3
/
110  
115  
125  
21-25  
124-149  
243-292  
378-454  
540-648  
850-1020  
291/4  
59  
2.5  
50,000  
4
130-156  
270-324  
400-480  
590-708  
1
1
1
1
1
1.670 50,000  
1.110 33,500  
0.833 25,000  
0.556 16,500  
0.417 12,500  
239  
119  
179  
239  
291/4  
59  
across the terminals of the capacitor in actual service.  
1000-1200 1280-1536  
3
/
21-25  
124-149  
216-259  
378-454  
540-648  
829-995  
21-25  
108-130  
161-193  
243-292  
400-480  
645-774  
21-25  
108-130  
189-227  
340-408  
460-552  
815-978  
1020-1224  
81-106  
145-174  
233-280  
378-454  
590-708  
800-960  
88-106  
124-149  
216-259  
340-408  
590-708  
43-52  
2.5  
50,000  
4
The maximum recommended cut-off voltages for the seven stan-  
dard voltage ratings are as follows:  
1
1
1
1
1
1.670 50,000  
1.110 33,500  
0.833 25,000  
0.556 16,500  
0.417 12,500  
89  
119  
179  
239  
291/4  
59  
Rated  
Maximum  
Voltage (rms) Cut-Off Voltage (rms)  
3
/
2.5  
50,000  
4
110  
115  
125  
165  
220  
250  
330  
140  
145  
160  
210  
280  
300  
400  
1
1
1
1
1.670 50,000  
1.110 33,500  
0.833 25,000  
0.556 16,500  
0.417 12,500  
1.670 33,500  
1.110 33,500  
0.833 25,000  
0.556 16,500  
0.417 12,500  
1.670 33,500  
1.110 33,500  
0.833 25,000  
0.556 16,500  
0.417 12,500  
1.670 33,500  
1.110 33,500  
0.833 25,000  
0.556 16,500  
0.417 12,500  
1.670 33,500  
1.110 33,500  
0.833 25,000  
0.556 16,500  
0.417 12,500  
89  
119  
179  
239  
59  
1
1
165  
220  
250  
330  
108-130  
130-156  
233-280  
378-454  
21-25  
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
1
89  
119  
179  
239  
59  
These ratings are based on the maximum capacitor temperature  
37-56  
72-86  
89  
88-106  
161-193  
270-324  
21-25  
145-174  
243-292  
430-516  
30-36  
119  
179  
239  
59  
of 150gF.  
1.2 CAPACITANCE RATING  
36-43  
64-77  
89  
The capacitance is chosen to give the necessary starting torque to  
the motor. The minimum capacitance value is the minimum de-  
signed capacitance. The maximum capacitance is 20% more than  
72-86  
88-106  
189-227  
324-389  
21-25  
119  
179  
239  
59  
108-130  
216-259  
21-25  
that value.  
25-36  
30-36  
89  
36-43  
64-77  
119  
179  
239  
72-86  
108-130  
88-106  
130-156  
1.3 DUTY CYCLE  
The duty cycle should be calculated for each application. It is the  
ratio of the time the capacitor is on voltage to the total time of one  
cycle. The duty cycles for the normal performance of Type 2  
(MSA) capacitors are listed in Figure A. NACC Type MSA ca-  
pacitors may be used in any intermittant application within their  
temperature and voltage range where the duty cycle does not ex-  
ceed that listed in the table in Figure A. This is in accordance  
with the standards in EIA Specification RS-463 for Type 2 ca-  
t Typical life expectancy is 50,000 cycles for 110, 115 and 125V  
ratings, and 40,000 total cycles for 165, 220, 250 and 330V  
ratings. The number of cycles shown in the table above are  
for the convenient test time of 35 days total for all ratings. See  
section 3.0 for testing procedures.  
Figure B:Type 1 (MSB)  
Life Test  
%
Duty  
Cycle  
Rated  
Voltage  
AC (rms)  
Duty Cycle  
pacitors.  
Duration of Test  
(Number of Starts)  
Capacitance  
Rating  
(On)  
(Off)  
If a particular application exceeds the normal duty cycle, but does  
not exceed the values listed in Figure B, an extra performance or  
3
/
110  
115  
125  
165  
220  
250  
330  
all  
all  
all  
all  
all  
all  
all  
291/4  
291/4  
291/4  
59  
59  
59  
2.5  
2.5  
2.5  
1.670  
1.670  
1.670  
1.670  
75,000  
75,000  
75,000  
40,000  
40,000  
40,000  
40,000  
4
3
/
4
3
/
Type 1 (MSB) capacitor is required.  
4
1
1
1
1
1.4 Frequency  
These capacitors are engineered for 60 Hz application but may  
be operated between 47 Hz and 60 Hz without damage provided  
voltage limitations stated above are observed. For other varia-  
tions in frequency, contact North American Capacitor Company,  
Indianapolis, IN.  
59  
If an application exceeds the duty cycles in Figure B, other  
methods of capacitor selection must be used. Contact NACC,  
Application Engineering for assistance.  
Mallory Products for CDE/6325 Digital Way/Indianapolis IN 46278/Phone: (317)275-2285/Fax: (317)275-2293  
5
Application Guide (Continued)  
halogenated cleaning solvents are not recommended and  
1.5 MOUNTING  
Vertical mounting of the capacitor with the terminals up is rec- should be avoided.  
ommended. However, horizontal mounting is acceptable provid-  
ing the vent is located in the up position. Vertical mounting with  
the terminals down is not recommended because the capacitor life  
may be reduced and the operation of the pressure relief vent im-  
1.7 SAFETY  
Because the watt-second value of these capacitors is high, pre-  
cautions should be taken during the testing and application of these  
devices.  
paired.  
Discharge resistors should be specified when there is a possibility  
of a residual charge left on the capacitor or to protect contacts.  
Mis-application, such as exceeding design limits or applying con-  
tinuous AC voltage, may result in destruction or explosion of  
capacitors.  
1.6 SOLVENTS  
Solvent residues on the capacitors after cleaning may penetrate  
the seal and cause internal corrosion resulting in shortened life.  
Alcohol or water detergent cleaning is not usually harmful but  
Performance Characteristics  
2.1 TEMPERATURE  
2.1.1 OPERATING: These capacitors are designed to oper-  
ate within the ambient temperature range of -40gC to +65gC.  
2.1.2 STORAGE: These capacitors may be subjected, with  
out permanent damage, to conditions in transit where temp-  
eratures range from -55gC to +95gC.  
10 and 55 cycles per second. The entire frequency range, 10 to  
55cps, shall be traversed in one minute.  
Capacitors shall be vibrated for 1 hour with the direction of mo-  
tion be in parallel to the axis of the capacitor. The capacitors shall  
then be placed so that the direction of motion is perpendicular to  
2.1.3 TOLERANCE: Unless otherwise specified, tempera-  
ture tolerance shall be Ȁ3gC.  
the axis and the vibration continued for one hour.  
2.2 FREQUENCY  
Unless otherwise specified, frequency shall be 50-60 Hz.  
There shall be no evidence of loosening of the capacitor element  
within the container, when shaken by hand following the test. There  
shall be no indication of intermittent contact during the 3 minute  
observation period. Capacitors shall not be open or shorted.  
2.3 VOLTAGE RATING  
The rated voltage is the rms value of AC voltage at which the  
capacitor may be operated at its normal duty cycle and maximum  
ambient temperature.  
2.7 CASE INSULATION TEST  
The capacitors shall be capable of withstanding the application of  
1500 volts ac rms 60 Hz for 5 seconds between the terminals and  
a metal foil tightly surrounding the lateral surface of the plastic  
2.4 CAPACITANCE AND POWER FACTOR  
The capacitance and power factor are measured by the voltage,  
current, power method with 60 Hz sinusoidal rated voltage ap-  
plied to the capacitor at standard conditions per EIA 463, Para-  
graph 9. Whenever voltage is applied, there is the possibility the  
capacitor may vent. Care should be taken to shield the capacitor  
from observers to prevent injury during testing.  
case or insulating sleeve without breakdown or flashover.  
2.8 OVERVOLTAGE TEST  
Capacitors shall be capable of withstanding the application of 140  
percent of rated voltage ac rms 60 Hz for one second at room  
temperature conditions without breakdown or visible damage to  
them.  
2.5 TERMINAL STRENGTH  
The capacitance terminals shall be capable of withstanding a steady  
pull of 10 pounds applied gradually in any direction for a period  
of 10 seconds. There shall be no loosening of the terminals or  
damage to the terminals or seal. A torque of 4 inch-pounds ap-  
2.9 VENT TEST  
Capacitors shall be capable of releasing any excessive internal  
pressure without violent expulsion of capacitor element or cover  
or emission of flame, when rated ac rms voltage 60 Hz is applied  
continuously to a capacitor. Care should be taken to shield the  
capacitor from observers to prevent injury.  
plied to the terminals shall not cause them to rotate.  
2.6 VIBRATION  
Capacitors shall be clamped rigidly to a vibration platform and  
subjected to a simple harmonic motion having a maximum peak-  
to-peak amplitude of .06 inches and a maximum acceleration of  
10g. The frequency of vibration shall be varied linearly between  
6
Mallory Products for CDE/6325 Digital Way/Indianapolis IN 46278/Phone: (317)275-2285/Fax: (317)275-2293  
Performance Characteristics (Continued)  
3.0 ACCELERATED LIFE TEST  
Capacitors shall be capable of withstanding life test in a 65gC  
Ȁ3gC ambient at rated sinusoidal voltage and frequency with cur-  
rent limiting and discharge resistors. A resistance equivalent to  
approximately 10% of the capacitor impedance shall be connected  
in series with each capacitor and a resistor of approximately 1000  
ohms shall be connected in parallel with each capacitor. Life test  
shall be conducted in a test chamber with capacitors separated by  
at least 1 inch of air and with sufficient circulation so that the  
ambient temperature remains within the above temperature limits  
and does not vary more than Ȁ1gC.  
Also capacitors shall not be exposed to direct radiation from heat-  
ing elements.  
Test voltage is applied to the capacitor resistor combination. Spe-  
cial test conditions for Type 1 and Type 2 capacitors are given in  
the tables in section 1.3. At the conclusion of the life test, at room  
temperature, the capacitance shall not differ from the initial mea-  
sured value by more than Ȁ25% and the power factor shall not  
exceed 20%.  
Procedure for Capacitance and Power Factor Measurement  
Type MS motor start capacitors are intended for intermittent duty application. The capacitance and power factor should be measured  
by or referenced to the ammeter and wattmeter (impedance) method described as follows.  
Capacitance is calculated by the following formula  
when frequency is 60 Hertz.  
I
W
2652 x Amps  
Switch  
Capacitance (ȐF) =  
Rated (Applied) Volts  
Capacitor  
Under Load  
AC Line  
V
Power factor is calculated as follows:  
Watts  
% Power factor =  
x 100  
Volts x Amps  
WARNING:Voltage should not be applied for more than 4 seconds to prevent over-heating of the capacitor  
and incorrect measurements.  
Test with capacitor in upright position (contacts up) to allow proper functioning of safety vent.  
Over heating of any capacitor may result in sudden expulsion of hot flammable material. Enclose the  
capacitor under test to prevent injury to persons in the event of abnormal capacitor failure.  
All measurements are referenced to 25gC (77gF). Capacitors just brought in from the cold or recently tested (hot) must be allowed to  
stabilize to room temperature (3-4 hours)  
Other methods of capacitance and power factor measurement may result in erroneous readings.  
For further information or help call North American Capacitor Co., AC Motor Start Product Manager at: (317) 273-0090  
The information contained herein is believed to be correct, but no guarantee or warranty, express or implied, with respect to accuracy, completeness or results is extended and  
no liability is assumed. Nothing herein is to be construed as advising or authorizing practice of any invention covered by existing patent rights owned by NACC or others  
without license from the owners thereof. In the interest of improved design and performance, NACC reserves the right to make changes in any specification, data or material  
contained herein.  
Mallory Products for CDE/6325 Digital Way/Indianapolis IN 46278/Phone: (317)275-2285/Fax: (317)275-2293  
7
Other electrical and electronic components available from NACC:  
b AC Motor Run Capacitors  
b Aluminum Electrolytic Capacitors  
b Solid Tantalum Capacitors  
b Wet Tantalum Capacitors  
b Leaded Ceramic Capacitors  
b DC Film Capacitors  
b Surface Mount Multilayer Ceramic Capacitors  
b Surface Mount DC Film Capacitors  
b DC Voltage Rotary Fans  
b Switches and Controls  
b Sonalertă Audible Signal Devices  
Mallory Products for CDE/6325 Digital Way/Indianapolis IN 46278/Phone: (317)275-2285/Fax: (317)275-2293  
Copyright ą 1997 NACC  
TIB MS00  

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