Easy-Start ES Instruction Manual
Pre-Installation
INSTALLATION
2-16
Considerations For Field
Wiring
The Easy-Start ES requires the following basic
electrical connections: (Refer to Section 2 for
connection diagrams.)
1. Three-phase line power. (Install proper
voltage plug, see Section 3.)
2. Three-phase AC motor connection.
3. Ground connections.
4. 120 VAC control power, and
RESET
Pushbutton.
5. Check CPT connections on fan cooled
models.
The three-phase line power can be from a
suitable disconnect switch or a circuit breaker.
By checking your particular options on your
starter, or by visual inspection, you can determine
if your starter has a factory installed circuit
breaker.
The motor must be a three-wire AC induction
motor.
The 120 VAC can be supplied from a separate
source, or from a control transformer such as a
480V/120V connected to the three-phase line.
By checking your particular options on your
starter, or by visual inspection, you can determine
if your starter has a factory installed isolation
transformer. See option section for CPT
connections.
After a trip, the Easy-Start ES must be reset by
momentarily opening the 120 VAC on the logic
board transformer T2. This is done by using a
normally closed
RESET
pushbutton between TB1
3 and TB1-17 on the logic board. Should
incoming power to the Easy-Start ES be lost for a
period of time (over 10 seconds) the Easy-Start
ES will automatically reset itself and be prepared
for a normal start upon restoration of power.
(This point is important should a customer
choose to start the Easy-Start ES by an external
contact closure rather than by standard three-
wire pushbutton controls.)
Fan Control Power Transformer
Easy-Start ES models rated 250 amps and above
are supplied with fans. The fans operate at
110/120 VAC supplied by a factory installed multi-
voltage control power transformer. Two primary
fuses FU-1 and FU-2 are supplied.
Notice
-
K102 relay is used to control the fans.
The relay is turned on and off by the start/stop
120 VAC control voltage.
A thermostat (close on temperature rise) is
connected across relay K102 contact and keeps
the fans running after the motor is turned off, if
the temperature in the enclosure is above the
thermostat specified limit. (Refer to Figures 2-9
and 2-10.)
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