KEB COMBIVERT F5 Instruction Manual page 178

Diagnostics and Troubleshooting
Error/Message Description
E.OL2
Error Low
Speed
Overload
E.dOH
Error Motor
Overheat
178
*Additional information at end of section
Cause/Solution/Troubleshoot
Occurs if the The cause of the Low Speed Overload would be due to
low frequency, excessive current at low speed (typically below 3Hz). The
standstill constant following may be causes of excessive current:
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 external If a motor PTC temperature sensor, relay, or KTY
motor temperature (special hardware required) is connected to terminals
sensor tripped. 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:
Insufficient motor cooling.
Incorrect motor data.
Verify motor data , specifi 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.
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).