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 |
| 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. |
| 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