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LED — Light-Emitting Diode
SCR — Silicon Control Rectifier
SMM — Starter Management Module
AK board power
applied, run command
given, starter at full
voltage, but aux LED
not lit.
AK board not functioning
properly.
Replace board.
1L boards LEDs lit. Motor terminal voltage
phase imbalance exists.
Check motor terminal voltages for imbalance between
phases. If an imbalance exists, check for loose SCR gate
or open SCR gate. Replace phase assembly, if necessary.
BC board LED L4 and
L5 not lit.
BC board not functioning
properly.
Replace board.
BC board LED L3 lit.
1.
FU5 and FU6 fuses not
functioning properly.
2.
Phase assembly not
functioning properly.
3.
Fan not functioning
properly.
1.
Check fuses FU5 and FU6. Replace if necessary.
2.
Verify that bypass is pulling in by measuring the voltage
drop across the contacts. The reading should be 50 mV
or less. Replace phase assembly, if necessary.
3.
Verify fan operation on each phase for 200 amp units.
Replace fan, if necessary.
BC board L2 lit. SCR phases not function-
ing properly.
Measure resistance from anode to cathode for each SCR
phase assembly. Replace shorted phase, if necessary.
BC board L1 lit. Motor lead grounded. Megger motor to test for motor lead going to ground.
Start command given. Motor does not begin rota-
tion.
Turn ‘Starting Torque’ potentiometer RV2 clockwise until
motor rotation begins.
Motor does not reach
full speed within 25
seconds.
Ramp up setting is not cor-
rect.
Turn ‘Ramp’ potentiometer RV1 counterclockwise. Restart
motor and verify that motor reaches full speed within 25
seconds.
115 vac missing from
LL1 and LL2.
1.
CB2 is not on.
2.
Fuse no. 4 (FU4) blown.
1.
Verify CB2 is on.
2.
Check FU4 for continuity. Replace, if necessary.
SMM not responding.
1.
CB4 is not on.
2.
Potentiometer RV1
needs adjustment.
1.
Verify CB4 is on.
2.
Adjust potentiometer RV1 for 24 vac at SMM terminals
J3-23 and J3-24.
Table 12 — Benshaw, Inc. Solid-State Starter Troubleshooting Guide (Continued)
Problem Probable Causes Area of Correction