Troubleshooting
24 COM-SVN01D-EN
If M1-M2 contacts are open, proceed as follows:
1. Check motor protection module for the correct input
voltage
on terminals L and N. Voltage applied to
module must match module input voltage as printed
on module nameplate.
2. Check wire connection tightness.
3. Try to reset the module (interrupt power for
five seconds).
4. If, after reset, module M1-M2 closes, determine which
fault
caused module to trip.
5. If M1-M2 remains open, proceed as follows:
Disconnect PTC thermistors from S1and S2 terminals,
and
measure the resistance of the PTC using a device
with a maximum output of 3 volts.
• Resistance
= ∞
Open PTC open; replace compressor
• Resistance
= 0 ohms
PTC shorted; replace compressor.
• Resistance
>2750 ohm
Wait until the motor has cooled down and
resistance
is less than 2750 ohms; reconnect and
try
to reset motor protector. Diagnose problem that
caused motor over temperature.
• Resistance
= 150 ohms < R< 1250 ohms
Normal resistance value for PTC ambient
temperature.
Test the module within the terminal box
1. Disconnect L-N voltage supply.
2. Disconnect S1-S2 PTC circuit on the module.
3. Disconnect M1-M2 safety circuit control contacts.
4. Apply a resistance between 150-1250 ohms across S1-
S2.
This simulates a functional, cool motor.
5. Reconnect L-N voltage supply. Insure that the voltage
to
L-N has been disabled for at least 5 seconds. This will
reset
the module.
6. Check M1-M2 with ohmmeter.
7. M1-M2 closed—Module okay.
8. M1-M2 open—Module defective.
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