Xylem IM253 R0 AquaStart Combination Soft Starters - Manual (Page 13)

13
U
100 %
Time
fixed voltage
current limit
reached set level
of current limit
Accel Time
CURRENT LIMITING FOR LOADS WITH HIGH OR CONSTANT STARTING TORQUE:
Current limiting control is used to adapt the Soft Starter to the capacity limits of the power supply. It is often used
with power generators with limited output but may also be used to keep current draw to a minimum on loads
with high or constant starting torque.
Optional Keypad:
1. Set P202 = 1 Type of control = Current Limit
2. Set P110 to % of current you wish to limit using example below.
3. Set P102 to desired acceleration.
Trim-Pot and Dip Switch Settings (Figure 9):
1. Set the Voltage Ramp/Current Limit dip switch to the Current Limit position.
2. Set the Current Limit Trim-Pot using the following example.
Calculation example for limiting the current to 2.5 x IN of the motor:
– IN of the switch = 60A
– IN of the motor = 52A
– ILIM = 250% of the IN of the motor
– 2.5x 52A =130A
– 130A / IN of the switch = 130A / 60A = 2.17 x IN of the switch
– Current Limit = 217% of the IN of the switch = 2.5x IN of the motor
Figure 10 - Current Limiting
Notes: (1) The Current Limit must be set at a level that permits
the motor to accelerate otherwise the motor will not start. (2)
If the full voltage is not reached at the end of the acceleration
ramp time an E62 error will occur and the motor will be
disabled. For details on Fault Codes please refer to Chapter 6 in the SSW07 User’s Guide. (3) For details on
Current Limiting please refer to Chapter 5 in the SSW07 User’s Guide.