Program features 131
Motor heating function
With the motor heating function, DC current can be injected into the motor to keep it
warm in low temperatures. The function can be enabled with parameter 2104 DC
HOLD CTL. The source to activated the function is selected with parameter 2115
MOT. HEATING SEL
.
Parameter 1805 DO SIGNAL and the relay outputs 1...4 (parameters 1401...1403
and 1410) can be used to indicate the status of motor heating.
Settings
Diagnostics
Critical speeds
Critical speeds function is available for applications where it is necessary to avoid
certain motor speeds (drive output frequencies) or speed bands (output frequency
bands) because of eg mechanical resonance problems. The user can define three
critical frequencies or frequency bands.
Settings
Parameter group 25 CRITICAL SPEEDS
Constant speeds
It is possible to define seven positive constant speeds. Constant speeds are selected
with digital inputs. Constant speed activation overrides the external speed reference.
Constant speed selections are ignored if
• PID reference is being followed, or
• drive is in the local control mode.
This function operates on a 2 ms time level.
Settings
Parameter group 12 CONSTANT SPEEDS
Parameter Additional information
2104 DC HOLD CTL Activates the motor heating feature
2114 HEATING CURR REF [%] A percentage of nominal current that is to be dc injected
into the motor windings.
2115 MOT. HEATING SEL Defines the input that turns On/Off motor heating.
Alarm Additional information
20381) MOTOR HEATING Motor heating active
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