Instruction Manual

6–5Troubleshooting
Publication 1397-5.0 — June, 2001
Fault No. Fault Name Description Action
023 “SCR #13 Open Flt” Indicates SCR number 13 is non–operational Check SCR wiring and connections
and replace SCR if necessary
024 “SCR #14 Open Flt” Indicates SCR number 14 is non–operational Check SCR wiring and connections
and replace SCR if necessary
025 “SCR #15 Open Flt” Indicates SCR number 15 is non–operational Check SCR wiring and connections
and replace SCR if necessary
026 “SCR #16 Open Flt” Indicates SCR number 15 is non–operational Check SCR wiring and connections
and replace SCR if necessary
027 “Multi SCR’s Open” One or more thyristor (SCR) is not carrying an equal load
possibly due to:
• Disconnected, loosely connected or damaged thyristor
gating circuit.
• Blown AC line fuse(s)
• Improper Speed/Voltage Loop tuning
• Malfunctioning thyristor (SCR)
Check SCRs, SCR wiring and AC Line
fuses. Repair or replace as
necessary. Run Speed/Voltage Loop
tuning if necessary.
030–044 “SCR Shorted Flt” One or more SCRs have shorted out possibly due to:
• Improper Heat Sink preparation
• Improper Torqueing of SCR
Replace shorted SCRs using the
correct heat sink compound and
torqueing techniques.
045 “SelfTune Abort” Auto Tune aborted by external input
Possible causes include:
• Operator stop initiated
• Drive interlock(s) open
• Drive fault became active
Check for drive faults, open interlocks
or programmed stop routines. Cycle
power to reset drive and attempt to
run Auto Tune again.
046 “ST Spd Fdbk Flt” A non-zero speed feedback value exists at self tune start
possibly due to:
• Incorrect speed feedback scaling or offset
• Overhauling load causing motor shaft rotation
Check process equipment to
determine if overhauling load exists. If
not, reset feedback scaling and offset.
047 “ST Inductance” Calculated armature inductance is out of range possibly
due to:
• Motor armature winding not connected or an open circuit
exists.
• Blown inverting fault (DC) fuse
• Inverting fault breaker tripped
• Armature inductance too high, tune current loop
manually
Check for blown fuses and open
circuit breakers, replace, reset and
tune as necessary. Check motor
armature inductance and windings.
Repair or replace as necessary.
048 “ST Max Current” A maximum current condition with minimum rotation exists
possibly due to:
• Inability of the motor to rotate freely due to mechanical
friction.
• Motor load is too high
• Motor field is not at normal operating temperature
Check the process equipment for
possible overloads caused by bad
bearings, slipping belts, outside
interference etc. Uncouple motor from
load and check that it rotates freely
when unloaded.
049 “ST Inertia Fault” Attached inertia is out of range possibly due to:
• Maximum Auto Tune speed reached
• Overhauling load present
• High mechanical friction present
• The Speed Loop cannot be auto tuned. Tune Speed
Loop manually.
Check the process equipment for a
possible overhauling load condition.
Check process equipment for
overload or mechanical binding
condition.
050 “ST Stability Flt” Speed instability exists possibly due to:
• Current Loop not properly tuned prior to the Speed Loop
• Tachometer feedback connected incorrectly
Check tachometer leads for damage,
incorrect connection or improper
conduit routing of leads.
051 “ST Stab<50 Fault” Auto Tune Stablty is too low, due to:
• Specified stability is less than that calculated by current
loop tuning.
Use 50 or greater.
052 “ST Stab<75 Fault” Auto Tune Stabilty is too low, possibly due to:
• Specified stability is less than that calculated by current
loop tuning.
Use 75 or greater.
074–084 “ST Fatal Fault” An autotuning fault occurred, with self tuning unable to
complete its routine.
Attempt to rerun autotune routine, or
tune manually to bypass the problem.