Conair Thermolator TW-S User Manual page 89

Unit Fa u lts
(Continued)
The Thermolator has detected a problem with the internal components, wiring, electrical power, or operat-
ing environment. Without correction, the fault could lead to equipment damage or personal injury if it is
not corrected.
• The controller displays an error code indicating the cause of the problem.
• The TCU may take automatic control actions, based on the nature of the fault, to best protect the op-
erator and the TCU until the fault is corrected.
• If the optional alarm package is installed, the fault strobe will illuminate and the audible alarm will
activate.
• Some faults require a power cycle to reset.
Fault
PUP

Pump Overload
The pump is pulling more electri-
cal current than its maximum rat-
ings permit. This is probably due
to excessive mechanical loading
of the motor.
WARNING: : Only qualified electri-
cal service personnel should
examine and correct problems
that require opening the unit's
electrical enclosure or checking
electrical current.
u ALARM LED illuminated.
u Optional strobe, sounder,
dry contacts actuated.
u Pump shuts off.
u Heater shuts off.
u Cooling valve closes.
The reset button on the over-
load must be depressed to clear
this fault.
See Resetting Pump
Overload section.
* % Voltage imbalance = 100 x (Maximum deviation from average voltage) / (average voltage)
Possible Cause
Is enough restriction provided in
the fluid circuit loop?
Is there mechanical binding due
to a physical jam/obstruction in
the pump casing volute?
Have the bearings in the motor
failed, causing excessive mechan-
ical loading or misalignment?
Is the correct voltage supplied to
the pump motor?
Is a phase open?
Is the motor overload faulty or set
incorrectly?
Solution
Install a flow-reducing orifice
or introduce some additional fit-
tings/smaller diameter piping.
Remove the endcap from the mo-
tor and check that the shaft is free
to rotate. If not, see Removing the
Pump and Motor.
Remove the endcap from the mo-
tor and check that the shaft is free
to rotate. If not, see Removing the
Pump and Motor.
Supply voltage should match the
rating on the pump nameplate
±10%. If voltage is correct, check
wiring connections.
Check voltage, L1 to L2, L2
to L3, L3 to L1. All should be
within 3% voltage imbalance*.
Disconnect the power and open
the electrical enclosure. Verify
that the overload is set to trip at
the proper amperage, which is
specified on the electrical power
prints. Manually trip and reset the
overload. If the problem contin-
ues, replace the overload.
See Re-
setting and Replacing Overloads.
(Continued)
Tro ub l es hoo ti n g I 6-17