Publication 20A-IN009C-EN-P
PowerFlex® 70 Adjustable Frequency AC Drive Installation Instructions 43
For a complete listing of Faults and Alarms, refer to the PowerFlex 70
User Manual, publication 20A-UM001.
Troubleshooting – Abbreviated Fault & Alarm Listing
Fault
No.
Type
(1)
Description Action
Auxiliary Input 2
➀
Auxiliary input interlock is open. Check remote wiring.
Decel Inhibit 24
➂
The drive is not following a
commanded deceleration
because it is attempting to limit
bus voltage.
1. Verify input voltage is within drive
specified limits.
2. Verify system ground impedance
follows proper grounding
techniques.
3. Disable bus regulation and/or add
dynamic brake resistor and/or
extend deceleration time.
FluxAmpsRef
Rang
78 The value for flux amps
determined by the Autotune
procedure exceeds the
programmed [Motor NP FLA].
1. Reprogram [Motor NP FLA] with
the correct motor nameplate
value.
2. Repeat Autotune.
HW OverCurrent 12
➀
The drive output current has
exceeded the hardware current
limit.
Check programming. Check for
excess load, improper DC boost
setting, DC brake volts set too high or
other causes of excess current.
IR Volts Range 77 “Calculate” is the autotune default
and the value determined by the
autotune procedure for IR Drop
Volts is not in the range of
acceptable values.
Re-enter motor nameplate data.
Motor Overload 7
➀
➂
Internal electronic overload trip.
Enable/Disable with [Fault Config
1].
An excessive motor load exists.
Reduce load so drive output current
does not exceed the current set by
[Motor NP FLA].
OverSpeed Limit 25
➀
Functions such as Slip
Compensation or Bus Regulation
have attempted to add an output
frequency adjustment greater
than that programmed in
[Overspeed Limit].
Remove excessive load or
overhauling conditions or increase
[Overspeed Limit].
OverVoltage 5
➀
DC bus voltage exceeded
maximum value.
Monitor the AC line for high line
voltage or transient conditions. Bus
overvoltage can also be caused by
motor regeneration. Extend the decel
time or install dynamic brake option.
SW OverCurrent 36
➀
Drive output current has
exceeded the 1ms current rating.
This rating is greater than the 3
second current rating and less
than the hardware overcurrent
fault level. It is typically 200-250%
of the drive continuous rating.
Check for excess load, improper DC
boost setting. DC brake volts set too
high.
(1) See the User Manual, publication 20A-UM001, for a description of fault types.
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