Emerson Unidrive M400 Series User Manual page 78

Safety Product Mechanical
information information installation
VM_MOTOR1_CURRENT_LIMIT
Units %
Range of [MIN] 0.0
Range of [MAX] 0.0 to 1000.0
VM_MOTOR1_CURRENT_LIMIT[MAX] is dependent on the drive rating and motor set-up parameters.
VM_MOTOR1_CURRENT_LIMIT[MIN] = 0.0
Open-loop
VM_MOTOR1_CURRENT_LIMIT[MAX] = (I
Where:
I
MaxRef
duty), otherwise it is the lower of 0.7 x Pr 11.061 or 1.1 x Pr 11.060 (i.e. Normal Duty).
Where:
Definition
For example, with a motor of the same rating as the drive and a power factor of 0.85, the maximum current limit is
165.2%.
The rated active and rated magnetising currents are calculated from the power factor (Pr 05.010) and motor rated
current (Pr 05.007) as:
RFC-A
VM_MOTOR1_CURRENT_LIMIT[MAX] = (I
Where:
For VM_MOTOR2_CURRENT_LIMIT[MAX] use Pr 21.007 instead of Pr 05.007 and Pr 21.010 instead of Pr 05.010.
VM_MOTOR2_CURRENT_LIMIT
Units %
Range of [MIN] 0.0
Range of [MAX] 0.0 to 1000.0
VM_MOTOR2_CURRENT_LIMIT[MAX] is dependent on the drive rating and motor set-up parameters.
VM_MOTOR2_CURRENT_LIMIT[MIN] = 0.0
Definition
Refer to VM_MOTOR1_CURRENT_LIMIT for more information. For VM_MOTOR2_CURRENT_LIMIT[MAX] use
Pr 21.007 instead of Pr 05.007 and Pr 21.010 instead of Pr 05.010.
78
Electrical Getting Basic
installation started parameters
Range applied to current limit parameters (motor 1)
-1
I = I x cos(sin (I
Tlimit MaxRef Mrated
= Pr 05.007 sin φ
I
Mrated
= Pr 05.007 x cos φ
I
Trated
cos φ = Pr 05.010
is 0.7 x Pr 11.061 when the motor rated current set in Pr 05.007 is less than or equal to Pr 11.032 (i.e. Heavy
MOTOR1_CURRENT_LIMIT_MAX
Motor rated current is given by Pr 05.007
PF is motor rated power factor given by Pr 05.010
(MOTOR2_CURRENT_LIMIT_MAX is calculated from the motor map 2 parameters)
The Maximum current is (1.5 x Rated drive current) when the rated current set by Pr 05.007 (or Pr 21.007 if motor
map 2 is selected) is less than or equal to the Maximum Heavy Duty current rating specified in Pr 11.032, otherwise
it is (1.1 x Maximum motor rated current).
rated active current = power factor x motor rated current
rated magnetising current = √(1 - power factor
-1
I = I x cos(sin (I
Tlimit MaxRef Mrated
I = Pr 05.007 x cos φ
Mrated 1
ITrated = Pr 05.007 x sin φ
1
φ = cos-1 (Pr 05.010) + φ . φ
1 2 1
in the Parameter Reference Guide for more information regarding φ
I is 0.9 x Pr 11.061 when the motor rated current set in Pr 05.007 is less than or equal to Pr 11.032 (i.e.
MaxRef
Heavy duty), otherwise it is the lower of 0.9 x Pr 11.061 or 1.1 x Pr 11.060 (i.e. Normal Duty).
Range applied to current limit parameters (motor 2)
Running NV Media Card
Optimization
the motor Operation
/ I ) x 100 %
Tlimit Trated
/ I ))
MaxRef
Maximum current
------------------------------------------------------ -
Motor rated current
= --------------------------------------------------------------------------------------------------------
PF
2
) x motor rated current
/ I ) x 100 %
Tlimit Trated
/ I ))
MaxRef
is calculated during an autotune. See the variable minimum / maximum calculations
Onboard Advanced
Diagnostics
PLC parameters
2
2
( )
+ PF – 1
× 100%
.
2
Unidrive M400 Control User Guide
UL
information
Issue Number: 1