Nc Unit And Electric Control Cabinet Troubleshooting; Resetting The Thermal Relay - Mazak VTC-160A Maintenance Manual

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5-10 NC Unit and Electric Control Cabinet
5-10-1 Troubleshooting
Symptom
• The following alarm message is
displayed on the screen:
"052: BATTERY ALARM"
• Error with the LCD screen
• The following alarm message is
displayed on the screen:
"053: TEMPERATURE ERROR"
• The following alarm message is
displayed on the screen:
"217: THERMAL TRIP"
"219: MAIN TRANSFORMER
OVERHEAT"

5-10-2 Resetting the thermal relay

If alarm message "AL 217 THERMAL TRIP" "AL 014 CONVEYOR THERMAL TRIP" is displayed,
any of the following thermal relays is tripped. This could be caused by the overload of the related
motor.
If a thermal relay is tripped, eliminate the cause and reset the thermal relay by pushing the
corresponding reset button as shown below (Fig. 5-12).
Check Points and Probable Causes
Voltage of the battery used to retain
the NC data is low.
(Battery has been used to the life.)
Power supply to the display is faulty,
or the display itself is faulty.
Ambient temperature of the NC unit
is higher than 45°C (113°F).
Cooling fan of the NC unit is
defective.
Any of the motors is overloaded.
The unit, which uses the motor for
which the terminal relay has been
tripped, is defective.
(The same alarm occurs again soon
even when the thermal relay is reset
after cooling the motor.)
FR10 (thermal relay under magnetic contactor KM10) ..... For hydraulic unit pump motor
FR11 (thermal relay under magnetic contactor KM11) ..... For flood coolant pump motor
FR4 (thermal relay under magnetic contactor KM4) ....... For spindle cooling pump motor
Reset button
Reset button
Fig. 5-12 Thermal Relay
Corrective Action
Change the battery.
The data will be lost if the battery is
not changed.
Contact Mazak Technical Center.
Lower the ambient temperature of
the machine.
Change the NC unit cooling fan.
Eliminate the cause of overload
and reset the thermal relay.
Follow the maintenance
instructions for the individual units.
If the cause is unknown, contact
your local Mazak Technical Center.
5-18
Refer to
Instruction
manual of the NC
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5-10-2
5-1 to 5-9
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