2 – 16 HEIDENHAIN Service Manual TNC 426/430 C/P/M
C350 Axis module
not ready
n No pulse release for the power
supply unit.
n Uz too high.
n 5-V power supply too weak.
n Inverter is not ready for operation.
n Motor control board defective.
n PWM cable defective.
n Noise pulses.
n Inform your service agency.
n Check the control and cabling of
the pulse release.
n Check Uz.
n With non-energy recovery power
module: Braking resistor
connected?
n With energy-recovery power
module: Energy recovery active?
n Check the grounding and shielding
of the cable.
n Exchange the power module.
n On P controls: Exchange the
interface card.
n Exchange the motor drive control
board.
C370 Angle error
motor encdr.
n Motor encoder defective.
n Motor encoder cable is defective.
n Drive control board defective.
n Inform your service agency.
n Check the motor encoder and
leads.
n Exchange drive control board.
C380 Motor not
controllable
n Motor cables were crossed
(e.g. X with Y).
n Motor encoder cables crossed.
n Phases connected incorrectly to
motor.
n Motor encoder cable is defective.
n Incorrect entry in motor table
(rotation direction, no. pole pairs).
n Motor defective.
n Check the motor cabling.
n Current or speed controller not
optimized (values too high).
n Inform your service agency.
n Check motor and motor cables.
n Check the entry in the motor table.
C3B0 Motor does
not rotate
n Inverter is not ready for operation.
n Disturbance on RDY input of PWM
output connector.
n Motor jammed.
n Inverter defective.
n Motor defective.
n Incorrect motor selected (MP2200).
n Assignment of PWM outputs
entered incorrectly in MP120.
n Assignment of PWM inputs
entered incorrectly in MP112.
n Motor power cables crossed.
n Motor encoder cables crossed.
n Motor connection defective.
n Inform your service agency.
n Check the inverter.
n Check the motor and cabling.
n Check the machine parameters.
CCU +5V LE
outside tolerance
2688 n The 5V power supply of the LE is
outside the permissible tolerance
range.
n Inform your service agency.
CCU amplitude too
high %.2s
2720 n The amplitude of the encoder signal
is too large or the signal for
contamination is active.
n Check the amplitude of the
encoder signal.
CCU amplitude too
small %.2s
44 n The amplitude of the encoder signal
is too small or the signal for
contamination is active.
n Check the amplitude of the
encoder signal.
Error message Error
number
Cause of error Corrective action
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