Pub 49004
Effective 9/00
Page 6
Catalog Steady State
Inrush
Input
Number
Wattage
Wattage
Voltage
PSS55A
55W
250W
115VAC
PSS55B
55W
250W
230VAC
PSS55C
55W
250W
360 - 480VAC
Protective Features, Cont’d
timer. If 24VDC power is removed, the soft starter remem-
bers the remaining cool-down time and will not reset until
the total cool-down time has elapsed.
The unit monitors these conditions for overload:
Thermal (current) Overload - monitors RMS, with a
5, 10, 20, or 30-second delay time based on Trip
Class setting.
Protective
Setting
Factory
Feature
Default
Overload
32% - 100% of rated current
32%
(FLA Dial Range)
Trip Class
5, 10, 20, 30
5
Fault Reset
Auto, Manual
Manual
Jam
On, Disable
On
Stall
On, Disable
On
Phase Loss
On, Disable
On
Phase Reversal
On, Disable
On
Overload
On, Disable
On
Programming Settings
General
To program and operate the IT Soft Starter, a Control
Interface Module (CIM) is required (see Fig. 6). The CIM
(Catalog No. EMA71) is for use with all models: S801N,
S801R, S801T, and S801V. The CIM (Catalog No. EMA72)
is used with all model S801N, S801R, S801T and S801V
with the pump control option (see Fig. 7). The CIM serves
as the interface between the operator and the Soft Starter
control circuitry to program the Soft Starter. The CIM dip
switches and rotary controls are used to select the Soft
Starter settings. When making adjustment to the CIM
under normal operation, the LEDs will function as follows:
A change to any dip switch will cause all LEDs to flash
momentarily.
An adjustment to any POT will cause all LEDs to light
and stay lit until adjustment of POT has been completed.
While selecting these parameters, 24VDC power may be
applied to the Soft Starter, but it is not required.
NOTE:
The IT Soft Starter does not have to be powered
to make adjustment to the control interface module. Once
the unit is energized, it will communicate with the CIM
and load the program into the Soft Starter. Allow the unit
2 seconds to ensure communication checks complete
and values are set. To verify CIM is operational, press
Fault Reset. If the CIM is powered and communicating,
all LEDs will momentarily flash.
See the user manual for additional detail on the standard
and pump control option.
Procedure for Starting
Application Note - Permissive (P)
(P) must be held high (24VDC) in order to START the
Soft Starter.
Remove 24VDC from terminal P to initiate a stop.
Run inputs (terminals 1 through 4) are a momentary
high (24VDC).
If the inputs (Input 1, 2, 3, 4) are high when the Per-
missive opens, the Soft Starter will STOP.
The Soft Starter will not start when 24VDC is applied
to the Permissive (P) until Input 1 changes from 0 volts
(open) to a high (+24V) condition. (Once P is at 24
volts, Input 1 must cycle from 0 volts to 24 volts to
start.)
On the larger soft starters when the bypass contactors
close, a sound similar to contactor chattering can be
heard. This sound is caused by more than one contactor
closing in a staggered manner over a very short period
of time. This is part of normal operation and should not
be misinterpreted as a dirty pickup.
For two-wire control, jumper permissive (P) and Input
1, together.
24VDC Power Requirements
When sizing a 24VDC power supply for your IT soft starter,
it must meet the following steady state and inrush charac-
teristics.
Steady State Minimum = 25 watts
Inrush Minimum = 240 watts for 150 msecs
Voltage on the unit cannot exceed 30VDC. The soft starter
will turn off at approximately 20.9VDC.
It is recommended that power supplies from Cutler-Hammer
be used.
The following C-H power supplies are available:
Table 5
Table 6
NOTE:
A minimum of #14 AWG should be used between
the power supply and the 24V (+) and (-) terminals of the
soft starter.
Protective Features
The soft starter cannot be restarted until the calculated
cool-down time has passed. Cycling power does not reset
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