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HD65 & HD130 STEPPER DRIVES USER GUIDE 19
Fault-finding Guide
If there is no response from the motor and the more obvious checks
have been made, the following guide may help to identify the
problem. Before going through the procedure, make sure that the
motor shaft is free to rotate with the drive switched off.
Turn the drive on and see which LEDs are illuminated. Then go to
the appropriate heading below.
Zero phase - listen for audible noise from the motor. If there
is none, check for open-circuit motor leads,
check energise input (motherboard switch 9 on
or terminal 7 connected to 0v).
Overload - switch off, disconnect the motor and switch on
again. If the overload LED is still on, the drive
has been damaged. If not check for short
circuits or crossed motor connections. A very
low inductance motor could also cause the
drive to trip out, if this is suspected try
connecting the motor in series.
Supply failure - check the AC supplies coming into the
motherboard. If these are OK, switch off, wait
for 3 minutes, unplug the drive and check the
fuses on the back of the motherboard. If OK,
there is probably an internal failure within the
drive.
Over-temperature - the drive has overheated and should be
switched off and left to cool. If it was previously
working satisfactorily, better cooling is needed.
On the HD130, check that the fan is running
and is not obstructed.
None at all - check as for "supply failure".
If there is audible noise from the motor but the drive does not
respond to clock pulses, look to see if the zero phase LED flashes.
If clock pulses are entering the drive, the LED should flash or go dim
depending on speed. If it doesn't, the drive is either not getting any
pulses or is not responding to them. Make sure the clock pulses go
low for at least 4uS and that the logic low level is below +1v.
CAUTION
Note that if the dump fuse (FS2) is blown it will take approxi-
mately 3 minutes for the main supply capacitor to discharge.
Always allow adequate time for the capacitor to discharge