ABB UMC22-FBP - Motor Current = Set Current Versus Wiring

- 18 -UMC22-FBP
Universal Motor Controller UMC22-FBP
Software version 4.0
FieldBusPlug / Issue: 02.2008
V 6
3.2.3 Motor current = Set current versus wiring
Have a look at the wiring of the motor to fi x the correct Set current for perfect motor protection.
Example:
For 冑3 (inner delta) wiring the parameter Current factor can be changed to 1.73 to get displayed the real
Set currents on the Control Panel and in the control system. The Delta 冑3 circuitry is normally used for
larger motors to reduce the current transformer size.
Fig. 3-4: Motor current = Set current versus wiring
Chapter 3.2.3~1
U2
W2
V2
V1 W1U1
UMC 22
U2W2 V2
V1 W1U1
400 V / 690 V
W2
U1
U2
V1 W1
V2
UMC 22
U2W2 V2
V1 W1U1
400 V / 690 V
V1 W1U1
W2
U2 V2
UMC 22
U2W2 V2
V1 W1U1
400 V / 690 V
Star
Power line: 690 V
Delta
Power line: 400 V
冑3 wiring
Power line: 400 V
Example for motor:
Motor rating plate
Example for motor:
Motor rating plate
Example for motor:
Motor rating plate
4.9 A / 2.8 A
4.9 A / 2.8 A 4.9 A / 2.8 A
Parameter
Set current = 2.80
Parameter
Set current = 4.90
Parameter
Set current = 2.80*
Terminal box Terminal box Terminal box
I
P
= 2.8 A / I
SC
= 2.8 A I
P
= 4.9 A / I
SC
= 4.9 A I
P
= 4.9 A / I
SC
= 2.8 A
I
SC
=
I
P
I
SC
=
I
P
I
SC
=
I
P
* 0.577
I
P
I
P
I
P
2CDC 342 063 F0203
I
P
= Actual current / phase
I
SC
= Set current
* Alternatively it is possible to set the parameter Current factor
to 1.7 and the parameter Set current to 4.9 A.