CHAPTER 5. TROUBLESHOOTING 45
An excessive deceleration rate will cause the motor to overshoot
when coming to rest, with the result that it performs too many steps.
This effect is usually accompanied by a screeching sound during
deceleration.
If the motor runs excessively hot, check the motor rating against the
drive output. If the motor is hot after a long period at standstill, check
the standby current with a meter in series with one motor phase. If
the motor is mis-indexing, the number of steps in error may give a
clue to the cause. Desynchronisation will give a multiple of 4 full
steps (8 half steps), whereas odd numbers of steps suggest noise on
the clock line and optical isolation should be considered.
Removal and
Replacement
of Drive
Module
The removal of the drive module is easily achieved in the following
manner:
(a) Ensure that all supplies have been switched off and capacitors
have time to discharge (wait for 2 minutes).
(b) Position the drive with the terminal blocks towards you as shown
in Figure 5-1 and remove the four M3 x 10mm screws marked A.
The screws at the back of the unit are holding the twosections of
the cover together - only remove the part of the cover with the
LED holes, leaving the part with the mains connector in place.
(c) Remove the two M3 x 10mm screws marked B which hold the
cover to the heatsink as shown in Figure 5-2. The drive cover
can now be gently pulled upwards from the unit.
(d) Remove the four M3 x 10mm screws marked C which secure the
drive module to the heatsink (see Figure 5-2). The drive module
can now be removed from the heatsink.
(e) Removal of the top cover with mains connector may be required
to reach fuses or change the HV voltage. There is no need to
remove any wires from the connector or the voltage selector.
Four M3 screws can be removed to swing the cover to one side.
Two screws hold the top cover to the chassis and two more hold
it to the heatsink.
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