DRIVE FAULTS
98
OTHER CONDITIONS
PROBABLE CAUSE / CORRECTIVE ACTION
NO LED DISPLAY WITH
POWER ON
No power at TB3 or failed power supply.
Verify 115 Vac control voltage at TB3(1 & 2)
Verify that cable J11 is seated properly.
Short circuit on external wiring dragging down the power
supply. Verify by temporary removal of wires at TB1(48, 82,
& 1). If display operation is restored. fix external problem.
Short circuit internal to current measuring transducer. Verify
by removal of J27. If display operation is restored, replace the
current transducer. DO NOT RUN THE DRIVE WITH
CURRENT TRANSDUCER DISCONNECTED.
5. Faulty or missing EPROM’S or faulty socket connections
at U13, 14, 39, 40.
LOSS OF STORED
PARAMETER DATA
Severe electrical disturbance with NV-Protect switch in
OFF position, or failure to actually save the data, or weak
battery within U56.
Remember to SAVE the data when parameters are changed.
See Section 3.6
Return NV-Protect switch to ON when parameter data
changes are completed. Magnetek recommends replacing
U56 every 8 years.
DRIVE DISPLAY INDICATES
BLOWN FUSES WHEN ALL
FUSES TEST GOOD WITH
OHMMETER
Control power applied before 3-phase armature supply.
Short circuit in +/-15 V wiring circuits prevents analog
circuit measurements from working.
Verify that 3-phase power and control power are supplied
simultaneously. Or that drive faults will be RESET by
external circuits after 3-phase power is applied.
Read power supply voltages at test points near the top front
of PCB A1. TP8 is circuit common. TP1, 2, 3, & 4 (just
below J11, to right of silver metal can U8) should be +24V,
+15V, -15V, +5V, +/-5% respectively.
If voltages in step 2 are low, unplug ribbon cables at J13 and
J14 (A1 PCB, lower left). If power supply voltages are
restored, pursue cause of short circuit on those cables.
Suspect faulty current transducer or cable.
Remove power supply cover. Disconnect power supply at
J11. Re-measure voltages at marked test points on power
supply PCB. If voltages are OK with J11 disconnected and
fault was not found in step 3, replace main PCB.
REPEATED FALSE OVER-
TEMPERATURE INDICATIONS
Leakage current between the thermistor on the heat-sink and
the thermistor leads can cause an elevated temperature to be
measured. Replace failing thermistor and/or thermostats.
Conditions out of the range specified tempurature range.
Figure 22: Other Faulting Conditions
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