9
Minimum Trim-Pots and Dip Switches to Set (P219 = 0):
Soft Starters are shipped with factory default values. If Trim-Pots and Dip Switches have been changed, it is advisable to
reset to factory default positions prior to a new installation by aligning all trim-pots and dip switches with the red factory
default dots. By default the control type is Voltage Ramp Starting. This control type is very easy to setup and is the most
commonly used starting method. Current Limit Starting is the second control type and is described below.
Motor Current Trim-Pot Setting - Factory default position is 100%
and is marked with a red dot. To protect the motor from overload,
obtain the full load amperage (FLA) off the motor and soft-starter
name plates. Using the following formula, calculate the percentage of
current that the motor will draw from the soft-starter and set the Motor
Current Trim-Pot accordingly.
– I
N
of the soft-starter = 170A
– I
N
of the motor = 140A
– I
N
of the motor / I
N
of the switch = 140A / 170A = 0.823
– Motor Current Trim-Pot = 82.3%
Figure 6 – Motor Current Trim-Pot Location
Thermal Class Dip Switch Setting – Set to factory default of 30 if
not specified on the motor name plate. (Note: Factory default
positions are marked with red dots).
Note: These are the minimum settings for a perfect adaptation
between soft starter and motor. For a complete description of Trim-
Pot and Dip Switch settings refer to Chapter 4 in the SSW07 User’s
Guide.
Figure 7 – Thermal Class Dip Switch Location
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 HMI:
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.
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