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2-4
Description
The Easy-Start ES solid state unit is a complete
reduced voltage 3-phase AC motor starter with
motor protection. It is available in basically 9
different sizes, NEMA-12/NEMA-1:
45 Amps...........................NEMA-12
70 Amps ...........................NEMA 12
Each size
120 Amps.........................NEMA-12
is rated
180 Amps...........................NEMA-1
for a
250/260 Amps ...NEMA-12/NEMA-1
starting
360 Amps .........................NEMA 12
duty
500/560 Amps ...NEMA-12/NEMA-1
for 20
750 Amps...........................NEMA-1
seconds.
950 Amps...........................NEMA-1
There are 3 AC line voltage combinations for
each size:
208/230/460V
50/60 Hz
380/415V
50/60 Hz
460/500/575V
50/60 Hz
This solid state starter incorporates 6 SCRÕs in
the power section. It provides a soft-start for 3-
phase induction motors either with voltage ramp,
or current ramp mode, and with current limit over
ride.
A built in energy saving circuit reduces the motor
voltage and current at light loads, and saves
power.
Block Diagram Description (Figure 2-1)
System Schematic (Figures 2-2 and 2-3)
The line current is sensed by using three
current
transformers
. These AC signals are converted
to DC through a rectifier. Also, each phase
current is signal conditioned to produce a DC
signal for that phase or power line.
DIP switches
are used to calibrate the current
rating and match it to the motor name plate for
these functions:
A.
Current Feedback
for energy saving load
sensing.
B. Over-Current protection:
1.
Inverse-Time Trip
2.
Instantaneous Trip
C.
Current Limit
By using
voltage feedback
, the Easy-Start ES
senses the motor load and slip-speed and
adjusts the motor voltage and current to conserve
power whenever the motor is lightly loaded. Line
voltage is also sensed in order to give motor
voltage regulation; this is especially useful at high
line voltages which could cause excess motor
temperature rises.
Easy-Start ES Instruction Manual
Pre-Installation
INSTALLATION
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