NFO
Drives
AB
2021
201013
‐
2
Operating
and
Installation
Manual
38
5.18 Alarm and fault procedures
During operation the inverter can identify several fault conditions listed in Table 18.
When a fault occurs in the inverter one of four things can happen:
1. the motor stops and the alarm relay indicates an alarm (
Fail
),
2. the motor continues to run and the alarm relay indicates an alarm (
Alarm
),
3. there is only a fault indication on the display (
Indication
),
4. nothing
(
Disable
).
The actions for each specific fault can be set individually se section 5.18.2 below.
If parameter
Auto Start
=
ON
and
Fail
is selected for the fault in question, an attempt will be made to restart the
motor after a given time (
Restart Delay
) provided that the cause of the fault has disappeared. The number of restart
attempts (
Error Count)
depends on the settings of the fault type (see Table 18). If more faults than the set
Error
Count
occur within time
Reset Time
, no further automatic restart attempts will be made and the fault has to be
manually reset. Once a fault has been acknowledged, the inverter can be restarted. Any faults that occur are
logged in the
Error log
. Some faults have to persist for a given time (
Delay
) before they generate a fault.
Motor
Fault e.g.
AC fail
ErrCnt
= 2
RstDly
RstDly
RstDly
RstDly
TrTime
TrTime
RstDly
is reset
Fig. 14. Typical fault situation
5.18.1 Fault log
The last 128 faults at any time are saved in a non-volatile memory in the inverter. To read the fault log, use
parameter
Error-log
. Press
or
to scroll through the fault messages saved. The fault type and when fault
occurred relative to the inverter’s operation time (
Op Time
) with a resolution of 0.01 hours (36 s) are shown. If the
same fault occurs repeatedly, only the first time and most recent occurrence is logged.
5.18.2 Fault messages
All fault messages, fault types and other fault parameter setting options are shown in Table 18 below. To configure
the parameters for a given fault, find the fault in parameter group
Error
.
Warning! Turning off (disable) any fault message may lead to inverter fault, and the warranty is no
longer valid. If you are in any doubt how to configure the error messages, contact NFO Drives AB.
Settings for faults:
Fail:
Motor stopped and alarm relay indicates alarm
Alarm:
Alarm relay indicates alarm (the motor is not stopped but new start is inhibited)
Indication:
Fault indication in display only (the motor is not stopped and new start is allowed)
Disable:
Fault turned off
3006469-2022-04
