Automationdirect.com Stellar SR44, User Manual

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2–3
2.2 – Electrical Connections – Specifications
2.2.1 – Electrical Supplies
The SR44 requires two AC electrical power sources:
1) A balanced 3-phase main source to provide the power for the controlled motor.
2) A single-phase supply: 115V or 230V, 50Hz/60Hz, for the internal control circuitry.
2.2.2 – Control, Power, and Ground Terminations
Control Terminal Specifications
Power and Ground Terminal Specifications
SR44 Control Terminal Specifications
Terminals
Terminal
Type Wire
Type
Cable Cross Section
Tightening
Torque
AWG
mm
2
Min Max Min Max
X1, X2
S0, S1
11, 12, 14
21, 22, 24
screw clamp
terminals
with captive
screws
solid or
stranded
22 14 0.3 2.5
4.4 lb·in
[0.5 N·m]
SR44 Power and Ground Terminal Specifications
Soft
Starter
Model
Terminals
Terminal
Type
Conductor Type
Cable Cross
Section *
Bus-
bar * Tightening
Torque
AWG
mm
2
mm
2
Size 1:
SR44-9
to SR44-146
Power
L1, L2, L3
T1, T2, T3
M8 metric
threaded
studs
Use 75 °C copper (CU)
conductor only, and the wire
shall be installed with eyelet
lug
1/0 50 n/a
106 lb·in
[12 N·m]
Ground
PE
Size 2:
SR44-174
to SR44-370
Power
L1, L2, L3
T1, T2, T3
Use 75 °C copper (CU)
conductor only, and the wire
shall be installed with eyelet
lug, or use busbar
2 x
250 MCM 2 x 120 20 x 6
Ground
PE
* The indicated conductor sizes are the maximum allowed by UL for each chassis size.
The actual conductors used must comply with local wiring regulations
The soft starter must be connected to a 3-phase power supply and a 3-phase load for proper operation.
Attempted starts will result in a starter fault if either the 3-phase power or the 3-phase load is not
connected.
The unit will not operate unless the control supply voltage is within the specified limits.
We recommend that the control supply be maintained between starts to ensure overload integrity,
since the overload will reset on control supply removal.
Chapter 2: Electrical Installation
SR44 Series Soft Starter User Manual
1st Ed, Rev B 07/31/2019