Magnetek Elevator Quattro DC - Page 106

Quattro DC Troubleshooting
104
Name Description
Possible Causes & Corrective Action
Encoder Flt
The drive is in a run condition
and the encoder is:
not functioning
or
not connected
or
phasing direction is not proper
with motor rotation.
Encoder Phasing Should Match Motor Rotation
 If Reversed Tach Fault is indicated the
encoder rotation is backwards
 Swap two encoder wires (A and /A)
 Verify that speed is reported back to the drive
by manually rotating the encoder and
observing the speed feedback on the display.
Encoder Power Supply Loss
 Check 12 or 5 volt supply on terminal strip
Accurate Parameters
 Verify motor nameplate values are entered
correctly
 Verify encoder PPR value is correct
 Verify that the Tach Volt Sense (A6) is at least
set to default.
 Verify that the Tach Speed Sense (A6) is at
least set to default.
 If problem is due to a high IR drop on the
armature, increase the value of Tach Volt
Sense (A6)
Response of Speed Regulator
 Enter accurate INERTIA (A1) parameter
 Increase RESPONSE (A1) parameter
Encoder Coupling Sloppy or Broken
 Check encoder to motor coupling
 Possible bad encoder
Excessive Noise on Encoder Lines
 Check encoder connections. Separate
encoder leads from power wiring (cross power
lead at 90)
 Ensure that encoder shaft and frame are
electrically isolated from the motor
Motor Problem
 Check for open motor armature (may occur
with Open Armature Flt)
 Check for dirty commutator
Hardware Problem
 Possible bad IGBT
 Possible bad Customer Interface PCB
Extrn Fault 1
User defined external logic fault
input
...Closure of this contact will
cause the drive to declare the
fault
Check Parameter Settings and External Fault
Signal Wiring
 Check the correct logic input is configured for
the correct TB1 terminal and set to EXTRN
FAULT 1 (C2)
 Verify the source of the external fault signal.
Extrn Fault 2
User defined external logic fault
input
...Closure of this contact will
cause the drive to declare the
fault
Check Parameter Settings and External Fault
Signal Wiring
 Check the correct logic input is configured for
the correct TB1 terminal and set to EXTRN
FAULT 2 (C2)
 Verify the source of the external fault signal.