Instruction Manual

6–3Troubleshooting
Publication 1397-5.0 — June, 2001
Table 6.A
1397 Fault Descriptions
Fault No. Fault Name Description Action
001 “IET Overcurrent” Armature current instantaneously exceeded 180% of
[Maximum Current] (P.040) Possibly due to:
• Incorrect armature current feedback scaling
• One or more thyristors not operating
• Improper Current Minor Loop tuning
• Motor Armature winding damaged
Check the motor and all thyristors.
Ensure that armature current
feedback scaling is correct. Replace
the motor if necessary.
002 “Tachometer Loss” Tachometer feedback signal missing possibly due to:
• Tach coupling broken or loose
• Disconnected, loose or damaged tach wires
• Pulse Tach supply voltage low
• Incorrect Analog Tach scaling
• Incorrect Pulse Tach configuration
• Motor armature winding not connected or open circuit
• Blown DC fuse
• Tach malfunction
Check the tach coupling, tach scaling,
tach configuration, fuses and motor
armature windings. Relplace the tach
and/or motor if necessary.
003 “Overspeed Fault” Motor Speed exceeded 110% of [Max Motor Speed]
(P.041) possibly due to:
• Incorrect tach scaling
• Blown field supply fuses
• Improper speed loop tuning
• Pulse Tach Quadrature set to ON for a non–regenerative
drive.
• Incorrect pulse tach wiring
Check pulse tach wiring, tach scaling,
fuses and speed loop tuning. Replace
tach if necessary.
004 “Fld Current Loss” The field loss detection circuit has not sensed any field
current flowing in the motor shunt field possibly due to:
• Motor field winding not connected or an open circuit
• Blown field supply fuse(s)
• Blown AC line fuse(s)
• Field supply failure
• Wiring harness damaged, loose or disconnected
Check fuses, field supply, wiring and
motor windings. Replace motor if
necessary.
005 “Sustained Overld” Inverse time overload circuit trip possibly caused by:
• Incorrect armature current feedback scaling
• Blown A C line fuses
• Mechanical binding preventing the motor shaft from
rotating freely
Check process equipment and motor
for binding. Check for blown fuses.
Check armature current feedback
scaling. Replace motor if necessary.
006 “Blower Starter” Blower motor starter is open. If a blower motor starter kit
is not installed, connector P8 must be fitted with the
proper substitute connector to inhibit this fault.
Other possible causes:
• Blown motor starter fuse(s)
• Disconnected, loosely connected or damaged blower
motor starter wiring
• Blower motor overload
Check motor starter fuses and wiring.
Replace blower motor starter and/or
blower motor if necessary.
007 “Open Armature” The motor armature circuit is open possibly due to:
• Motor armature winding not connected or an open circuit
• Blown inverting fault (DC) fuse
• Inverting fault breaker tripped
Check breakers and fuses. Check
motor armature windings. Replace
motor if necessary.