KEB COMBIVERT F5 Operation Manual page 94

Drive Faults
Error/Message Alt.
(NUM)
Error Low EOL2
Speed Over- (19)
load
Error Motor EdOH
Overheat (9)
94
/ Description
Occurs if the low
frequency, stand-
still constant cur-
rent is exceeded
(see Technical
Data for stall cur-
rent levels and
overload charac-
teristics).
The error can
only be reset if
the
cooling time has
elapsed and
E.nOL2 is dis-
played.
The external mo-
tor temperature
sensor tripped.
Cause/Solution/Troubleshoot
The cause of the Low Speed Overload would be due
to excessive current at low speed (typically below 3Hz).
The following may be causes of excessive current:
Incorrect motor data.
Verify motor data, specifically the motor rated speed
and frequency relationship (Diagnostic Screen #12)
for PM Synchronous Motors (see Section 5.5.2,
LM02 or LM04, for details).
Verify correct encoder settings including:
LE02 Encoder Pulse Number
LE03 Swap Encoder Channels (A/B setting)
LE06 Encoder Pole position for PM Synchronous
Motors. Relearn Encoder Pole Position as needed
(see Section 4.10.1 or 4.10.2).
High mechanical load/issues (friction).
If a motor PTC temperature sensor, relay, or KTY (special
hardware required) is connected to terminals T1, T2 and
the motor overheat function LX10 EdOH Function = On,
then if the PTC resistance exceeds 1650 Ohms, relay
opens, or the KTY sensor is above the set value in LM10
Motor Overload temp, then a motor overheat is detected.
Cause of excessive motor heating may include:
Excessive current.
Verify correct motor data.
Verify correct encoder settings including:
LE02 Encoder Pulse Number
LE03 Swap Encoder Channels (A/B setting)
LE06 Encoder Pole position for PM Synchronous
Motors.
High mechanical load/issues (friction).
Insufficient motor cooling.