178
Diagnostics and Troubleshooting
*Additional information at end of section
Error/Message Description Cause/Solution/Troubleshoot
E.OL2
Error Low
Speed
Overload
Occurs if the
low frequency,
standstill constant
current is
exceeded (see
Technical
Data for stall
current levels
and overload
characteristics).
The error can only
be reset if the
cooling time
has elapsed
and E.nOL2 is
displayed.
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 , speci cally the motor rated
speed and frequency relationship for PM
Synchronous Motors
Verify correct encoder settings including:
LF.27 Encoder Pulse Number
LF.28 Swap Encoder Channels (A/B setting)
LF.77 Encoder Pole position for PM Synchronous
Motors. Relearn Encoder Pole Position as needed
(see Section 5.11.1 )
High mechanical load/issues (friction) such as
starting or stopping against brake.
E.dOH
Error Motor
Overheat
The external
motor temperature
sensor tripped.
If a motor PTC temperature sensor, relay, or KTY
(special hardware required) is connected to terminals
T1, T2 and the motor overheat function US.33 EdOH
Function = On, then if the PTC resistance exceeds 1650
Ohms, relay opens.
Cause of excessive motor heating may include:
Excessive current.
Verify correct motor data.
Verify correct encoder settings including:
LF.27 Encoder Pulse Number
LF.28 Swap Encoder Channels (A/B setting)
LF.77 Encoder Pole position for PM
Synchronous Motors.
High mechanical load/issues (friction).
Insufficient motor cooling.
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