TM 5-4520-256-14
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
12.
MOTOR STARTER (ARMY MODEL H83 ONLY) FAILED TO LIMIT INRUSH CURRENT TO B1 MOTOR AND
CIRCUIT BREAKER ON INPUT 3KW GENERATOR TRIPS.
WARNING
Be careful when working with live electrical circuits to prevent contacting electrical voltages
which could cause death or serious injury. Personnel should stand on "High voltage"
switchboard matting (Federal Specification ZZ-M-81A), 3/16 inch (4.8 mm) or greater, to avoid
being grounded.
Step 1.
Check for 120 ( +/-10) Vac at L1 of K9 contactor, connector 1 of PR1 Resistor, and input power of
K10 Timer Relay with OFF/VENT/HEAT switch (S1) in vent position.
If voltage is not present (indicating open wiring), replacewiring.
If voltage is correct, proceed to step 2.
Step 2.
Check for 88 (+/-2) Vac at connector 2 of PR1 Resistor with OFF/VENT/HEAT switch (S1) in vent
position.
NOTE
Voltage will be 88(+/-2) Vac instantly, then increase to 120 (+/-10) Vac within 3 seconds.
If voltage is not present (indicating PR1 resistor is open), proceed to step 3.
If voltage is 120 (+/-10) Vac before 3 seconds (indicating shorted resistor), proceed to step 3.
If voltage is correct, proceed to step 4.
Step 3.
Check for 1.0 ohms across PR1 resistor.
If ohms is not present (indicating open in PRI resistor) replace resistor (para 3-32.1).
If continuity is present (indicating short in PR1 resistor) replace resistor (para 3-32.1).
Change 4 3-16.1
