CONTREX CXB2040 - Manual (Page 42)

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7.2.6 Over Temp Fault:
When the heatsink and or motor temperature has reached a level that, if exceeded, would damage the
output transistors or the motor, the Run LED will turn off, the OVER TEMP LED is latched on, a Fault
Output is generated, and the amplifier is inhibited.
The following is a list of possible causes:
1. Loss of cooling air - Fans are defective or airflow is blocked.
2. Excessive rise in cooling air temperature due to cabinet ports being blocked or excessive
hot air being ingested.
3. Extended operational duty cycle due to mechanical overload of motor or defective motor.
4. The motors thermal switch has been tripped due to excessive overloading.
7.2.7 Over Voltage Fault:
When the DC-Buss voltage reaches a level that, if exceeded, would harm the amplifier or motor, the
Run LED will turn off, the Over-voltage LED’s are latched on, a Fault Output is generated, and the
amplifier is inhibited.
The following is a list of possible causes:
1. Main AC line voltage is too high.
2. Decelerating a large inertial load. When decelerating, a DC motor acts as a generator. If the inertial
load is large, the generated voltage can pump-up the DC-Buss. If this fault occurs, you may need a
Regen Clamp. Consult CONTREX.
7.2.8 Resetting A Fault:
The fault latch may be reset by pushing the Reset button, activating the Reset input J1-13 or by
removing power and allowing the filter capacitor(s) to discharge. Note that the fault latch will not reset
unless the fault has been cleared.
7.3 AMPLIFIER FAILURE:
If an amplifier should fail, that is, if it should cease to operate with no apparent fault, the drawings in
appendices A and B will enable a skilled technician to trouble-shoot an amplifier to even lower levels.
The modular construction of the amplifier allows fast and easy repair. This is especially true due to
the plug-in personality module card, since all user adjustments and configuration changes are made on
this card. If an amplifier module should fail, simply unplug the pre-amp and plug it into a replacement
amplifier.
CHAPTER 7: MAINTENANCE, REPAIR, and WARRANTY