Troubleshooting
DynaDrive 1525-BRS - User Guide Page 18
5.1.2.3 SURGE/GROUND FAULT
• Surge - Indicates an excessive amount of current through the power transistors in the
output power bridge. This condition may be due to a damaged output power device or
shorted output leads to the motor.
• Ground fault
- One of the output wires to the motor is shorted to ground. This condition
may be due to faulty or pinched wiring or the motor is arcing to the case ground.
5.2 Other Conditions
Problem Possible Solution
MOTOR OR MACHINE
RUNS AWAY
1.Check the tachometer voltage to the amplifier by testing TP3
with respect to TP1. Then look at TP6 with respect to TP1 with a
voltmeter.
2.Ensure the tachometer signal is phased correctly.
3.Check to see if the position loop phasing (CNC command) is
correct relative to the position encoder feedback device.
5.3 Test Points
Test Point Pin Observed Signal
TP1 COMMON
TP2 SIGNAL input POT wiper
TP3 TACH input wiper
TP4 COMPPENSATION POT wiper
TP5 PEAK CURR LIMIT POT wiper
TP6 TACH IN signal directly connected to J1, pin 3 thru a 10K resistor
TP7 RMS current setting pot wiper
TP8 Front-end opamp output (J3, pin 2)
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