Emerson Unidrive M702 - Page 141

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Unidrive M702 User Guide 141
Issue Number: 3
VM_LOW_UNDER_VOLTS Range applied the low under-voltage threshold
Units V
Range of [MIN] 24
Range of [MAX] 24 to 1150
Definition
If Back-up Mode Enable (06.068) = 0:
VM_LOW_UNDER_VOLTS[MAX] = VM_STD_UNDER_VOLTS[MIN]
If Back-up Mode Enable (06.068) = 1:
VM_LOW_UNDER_VOLTS[MAX] = VM_STD_UNDER_VOLTS[MIN] / 1.1.
VM_LOW_UNDER_VOLTS[MIN] = 24.
VM_MOTOR1_CURRENT_LIMIT
Range applied to current limit parameters
VM_MOTOR2_CURRENT_LIMIT
Units %
Range of [MIN] 0.0
Range of [MAX] 0.0 to 1000.0
Definition
VM_MOTOR1_CURRENT_LIMIT[MIN] = 0.0
Open-loop
VM_MOTOR1_CURRENT_LIMIT[MAX] = (I
Tlimit
/ I
Trated
) x 100 %
Where:
I
Tlimit
= I
MaxRef
x cos(sin
-1
(I
Mrated
/ I
MaxRef
))
I
Mrated
= Pr 05.007 sin φ
I
Trated
= Pr 05.007 x cos φ
cos φ = Pr 05.010
I
MaxRef
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 duty), otherwise it is the lower of 0.7 x Pr 11.061 or 1.1 x Pr 11.060 (i.e. Normal duty).
RFC-A
VM_MOTOR1_CURRENT_LIMIT[MAX] = (I
Tlimit
/ I
Trated
) x 100 %
Where:
I
Tlimit
= I
MaxRef
x cos(sin
-1
(I
Mrated
/ I
MaxRef
))
I
Mrated
= Pr 05.007 x cos φ
1
ITrated = Pr 05.007 x sin φ
1
φ
1
= cos-1 (Pr 05.010) + φ
2
. φ
1
is calculated during an autotune. See the variable minimum / maximum calculations
in the Parameter Reference Guide for more information regarding φ
2
.
I
MaxRef
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.
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).
RFC-S and Regen
VM_MOTOR1_CURRENT_LIMIT[MAX] = (I
MaxRef
/ Pr 05.007) x 100 %
Where:
I
MaxRef
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.
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).
For VM_MOTOR2_CURRENT_LIMIT[MAX] use Pr 21.007 instead of Pr 05.007 and Pr 21.010 instead of Pr 05.010.