Rockwell Automation 193 193-5.0: Bulletin 913/592 SMP-3 Solid-State Overload Relay - Manual (Page 99)

Chapter 9 – Troubleshooting and Fault Information
9-7
Table 9.B Fault Descriptions
Fault Name and Number Fault Description Action to Take
Test
F1
The TEST DIP switch on the SMP-3 overload relay is ON. Turn off the TEST DIP switch and reset the SMP-3 overload
relay.
Overload
F2
The SMP-3 overload relay detected current greater than the trip
rating of the SMP-3 overload relay for a period of time such that
the percent TCU reached 100%. 1. Check the motor for excessive load.
2. Check the motor for damage to the insulation.
3. Check motor conductors for shorts.
Phase Loss
F3
The SMP-3 overload relay has detected the current imbalance
between phases to be >50% for
≥
1 second while operating at
≥
30% FLC current.
1. Check the power supply to ensure that all phases are
present.
2. If protected by fuses, check for a blown fuse.
3. Ensure that the SMP-3 connection to the contactor is
secure.
4. Check conductors to motor.
5. Check the motor for an open phase.
6. Single phase applications must be wired so that the current
passes through all three phases of the SMP-3 overload
relay. (See the single phase wiring diagram on page 3-16.)
Ground Fault
F4
The Ground Fault (GF) DIP switch on the SMP-3 overload relay
is ON, and
≥
50% phase current is not returning to the SMP-3
overload relay for
≥
0.5 second after the SMP-3 overload relay
has operated at
≥
30% FLC for more than one trip class time
period.
1. The GF DIP switch must be OFF when used with single
phase motors.
2. Check conductors to the motor for shorts to ground.
3. Check the motor for low resistance to ground. Moisture or
conductive dust may cause this fault.