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Chapter 5 - Fan control application
POWERXL DM1 SERIES VARIABLE FREQUENCY DRIVES
MN040049EN
—September 2021 www.eaton.com
Table 27. Motor control (Cont.).
P5.1.2
a
Current limit
ID 107
Minimum value:
DriveNomCurrCT*1/10 A
Maximum value:
DriveNomCurrCT*2 A
Default value:
DriveNomCurrCT*3/2 A
Description:
This parameter determines the maximum output current allowed from the drive. The parameter value range differs from size to size.
Once the motor current hits this level, it goes into the current limiter controller and tries to limit the output current.
P5.1.3
ab
V/Hz optimization
ID 109
Minimum value:
N.A.
Maximum value:
N.A.
Default value:
0
Options:
0 = Disable torque boost function.
1 = Enable torque boost function.
Description:
Automatic torque boost - the voltage to the motor increases automatically, which assists the motor to produce sufficient torque to start
and run at low frequencies with high loads.
P5.1.4
ab
V/Hz ratio
ID 108
Minimum value:
N.A.
Maximum value:
N.A.
Default value:
0
Options:
0 = Linear - the voltage of the motor changes linearly with the frequency in the constant flux area from 0 Hz to the field weakening point
where the nominal voltage is supplied. A linear V/Hz ratio should be used in constant torque applications.
1 = Squared - the voltage of the motor changes following a squared curve with the frequency in the area from 0 Hz to the field
weakening point where the nominal voltage is supplied. The motor runs under magnetized below the field weakening point and
produces less torque and electromechanical noise. A squared V/Hz ratio can be used in applications where the torque demand of
the load is proportional to the square of the speed.
3 = Linear
with flux optimization - the drive starts to search for the minimum motor current in order to save energy. This mode is called
Eaton’s Active Energy Con
trol which will reduce the voltage and current but still maintain the desired speed.
Description:
Selects the V/Hz ratio.
0 = Linear;
1 = Squared; or
3 = flux optimization.
U[V]
f [Hz]
Linear
Squared
Un
Voltage
at FWP
Default: Nominal
Voltage of the Motor
Field Weakening
Point
Default: Nominal
Frequency of the
Motor
0 = Linear and 1 = Squared.
P5.1.10
b
Switching frequency
ID 288
Minimum value:
MinSwitchFreq kHz
Maximum value:
MaxSwitchFreq kHz
Default value:
DefaultSwitchFreqCT
kHz
Description:
Sets the switching frequency for the PWM output waveform.
P5.1.16
ab
Identification
ID 299
Minimum value:
N.A.
Maximum value:
N.A.
Default value:
0
Options:
0 = Not action.
1 = Identification only stator resistor - does not spin the motor. This can be done with load attached.
2 = Identification with run - motor stator resistor is completed then the motor is run. This
must
be completed with unloaded motor.
3 = Identification no run - motor is supplied with current and voltage but at zero frequency.
4 = Identification only inertia - identification for the system inertia only.
Description:
This parameter enables the drive to make an motor identification cycle of the motor once complete the drive will adjust tuning
parameters to improve starting torque and open loop vector control performance. Once set and a run command is given, the operation
will be active then set back to 0 when completed. When a run command is issued, the message on the keypad will indicate ”Auto
tuning” is being performed. If there is an issue with the motor identification, a fault message will be displayed.
a
Parameter value can only be changed after the drive has stopped.
b
Parameter value will be set to be default when changing macros.