12
Symptom
Possible Cause
Correction *
Motor slows.
Motor overloaded.
Reduce load to motor; do not press so
hard.
Low line voltage.
Check power line for proper voltage.
Loose electrical connections.
Inspect connections.
Frequent fuse or circuit
breaker failure.
Motor overload.
Reduce load to motor; do not press so
hard.
Electrical circuit overload; too many
electrical machines running on same
circuit.
Turn off other machines and try again.
Incorrect fuse or circuit breaker
Have electrician upgrade service to outlet.
Excessive vibration.
Wheel(s) out of balance; wobbling or
not rotating concentric to arbor.
Rake the wheel or replace it. Adjust
wobble by rotating flange as needed.
Improper mounting.
Secure machine firmly to bench or stand.
10.2
Digital readout error codes
Table 4
Message Possible
Cause
Correction
*
OCL Internal
electronic
overload has been tripped.
Do not overload motor; reduce pressure of
workpiece against wheels.
OH
IGBT protection activated.
Inspect wire connections to U/V/W for possible
short circuits. Verify that motor rating
corresponds to AC motor drive output power.
OE
Excessive input voltage (exceeds AC driver
limits).
Use correct voltage.
LE1
Low voltage; AC motor driver detects that DC
bus voltage has fallen below minimum
threshold
Make sure input voltage falls within range of AC
motor input voltage range. Check for abnormal
load in motor.
LP1
Low input voltage (below AC driver limits)
Use correct voltage.
*
WARNING:
Some corrections may require a qualified electrician.
