Symptom Possible Cause(s) Corrective Action(s) Section
Alarm 151 LOW THROUGH SPINDLE
COOLANT
A short circuit in the pump motor or
pump motor cable caused a fuse to
blow or a circuit breaker to trip.
Check the circuit breakers
and fuses on the power
supply PCB.
Check for shorts in the TSC
pump cable and the motor
leads.
1
Incorrect power phasing - the
pump motor is running backward.
Check the phasing
indicators and change the
incoming power cables, if
necessary.
2
Damage to the motor shaft key,
shaft collar, or wear in other parts
of the pump head assembly.
Inspect the motor shaft /
pump head assembly.
3
The TSC pressure sensor is
defective. Some coolant flow may
occur if this is the case.
Troubleshoot the coolant
pressure sensor.
4
Low coolant flow, no alarm.
Low coolant flow, the pump cavitates
(cavitation sounds like heavy grit in the
pump head, or a suction sound) or is
otherwise noisy
Damage to the motor shaft key,
shaft collar, or wear in other parts
of the pump head assembly.
Inspect the motor shaft /
pump head assembly.
3
The coolant does not return to the
coolant tank fast enough.
Remove chip buildup from
the coolant return path.
5
The coolant level in the coolant
tank is low.
Fill the coolant tank.
The pressure relief spring in the
pump head is damaged.
Inspect the pressure relief
spring.
6
The TSC pump filter or intake
strainer is clogged.
Clean the filters. Remove
chips from the coolant
system.
7
The Auto-clean coolant pump filter
does not work (if equipped).
Test and troubleshoot the
Auto-clean pump filter.
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