Magpowr PS90 Instruction Manuals - page 3
3
5.0 Maintenance
The only maintenance that may be required on the PS90 is fuse replacement. Replacement of the fuse(s) requires
first removing ac power, then opening the enclosure. The enclosure must be re-installed to maintain the IP rating.
The enclosure may be opened by inserting a flat blade screwdriver under the retaining tabs in the base (See figure
2).
6.0 Troubleshooting
Symptom
Possible Cause
Solution or Diagnostic
No AC power.
Verify incoming power is correct
voltage and frequency.
Fuses blown.
Clutch / brake wires shorted together
or shorted to ground.
Clutch / brake wires open
circuit.
Disconnect clutch / brake wires at the
PS90 and check for proper
clutch / brake resistance between the
wires.
No clutch / brake
output.
Remote potentiometer or
external power supply not wired
correctly, or shorted together.
Voltage between terminal 24 and 26
should be 10 vdc.
Voltage between terminal 25 and 26
should vary from 0 to 10 vdc as the
potentiometer or external 0 to10 vdc
power supply is moved through its
range of travel.
Incorrect type of meter.
Meter should be a current meter with
1 ma full scale and no more than
3 kohm resistance.
Remote meter not
working.
Meter wires shorted or open.
Disconnect meter wiring at the PS90
and check for proper meter resistance
between the wires.
7.0 Options
The PS90 is factory adjusted to provide full reverse current with 0 vdc input. If some other current is desired with 0
vdc input or the minimum remote potentiometer setting, the minimum current potentiometer may be adjusted by
cutting out the hole shown on the label and then using a trimpot adjustment tool. Modifying this setting will cause
the clutch / brake drag torque to be higher than expected and is not recommended.