CONTREX CXB2040 - Manual (Page 41)

CXB1525 and CXB2040 MANUAL
8900 Zachary Lane N., Maple Grove, MN 55369 U.S.A. 38
7.2.2 Under-Voltage Fault:
When the +15VDC is below +12VDC, a level that would cause unreliable operation, the Run LED
will turn off, a Fault Output is generated, and the amplifier is inhibited. This is not a latched condition:
that is, if the problem is resolved the amplifier will resume operation.
The following is a list of possible causes:
1. Main AC line voltage is too low.
2. Bad rectifier bridge.
3. Bad DC buss filter capacitor.
7.2.3 Motor Over-Temp Fault:
When the motor temperature has reached a level that, if exceeded, would damage the motor, the Run
LED will turn off, the OVER TEMP LED will turn on and a Fault Output is generated, and the amplifier
is inhibited.
The following is a list of possible causes:
1. The continuous motor current is too high.
2. Binding or stalling of motor shaft due to excessive mechanical overload.
3. Motor rating too small for the load.
7.2.4 High-Speed Electronic Circuit Breaker (HS/ECB) Fault:
When the peak output of the amplifier exceeds 80A for 10 micro-seconds, the Run LED will turn off,
the HS/ECB LED's are latched on, a Fault Output is generated, and the amplifier is inhibited.
The following is a list of possible causes:
1. Shorted motor leads.
2. Motor inductance too low.
3. Short from a motor lead to ground.
7.2.5 Low-Speed Electronic Circuit Breaker (LS/ECB) Fault:
When the RMS output of the amplifier exceeds the current set to protect the motor and or the
maximum setting of the amplifier for 3 seconds, the Run LED will turn off, the LS/ECB LED's are
latched on, a Fault Output is generated, and the amplifier is inhibited. Refer to section 1.3.1.1 for the
amplifier rms settings.
The following is a list of possible causes:
1. Binding or stalling of motor shaft due to excessive mechanical overload.
2. Overload of amplifier output to motor.
3. Large reflected load inertia.