Automation Direct Stellar SR55 Series - Page 27

Chapter 2: Electrical Installation
Page 2–7Stellar
®
SR55 Series Soft Starter User Manual – 1st Ed, Rev F – 09/18/2019
elecTRIcAl WIRING
poWer CirCuiT Wiring
In Line
Induction
Motor
In Delta
Induction
Motor
U1
U2
V2 W2
V1 W1
Term Fwd Rev
2/T1 U1 U1
4/T2 V1 W1
6/T3 W1 V1
1/L1 W2 V2
3/L2 U2 U2
5/L3 V2 W2
So starter
must be
grounded
K1 – Main contactor or
circuit breaker isolation
and protection switch gear
(provided by the customer)
K1 – Main contactor
and protection switch gear
(provided by the customer)
Circuit breaker isolation
alone is not allowed for
In-Delta operation.
K1 (Main contactor)
controlled by the Run
relay on the SR55 MUST
be used for isolation.
NOTE:

RJ12 serial
comm port

Control wiring
terminals behind
hinged front cover

Optional
EtherNet/IP
comm module
slot

RJ45 port
(future use)
For wire size and torque requirements, refer to the “Wire Sizes and Torques” section of this
chapter.
for suiTable shorT-circuiT proTecTion devices (scpds), refer To The “circuiT proTecTion”
secTion of This chapTer.
In Delta WIrIng: for This configuraTion, applying The following equaTion allows The use of a
lower currenT-raTed sr55 Than The moTor flc: sr55 ie = ie (moTor) / √3.
when in-delTa configuraTion is used, a line conTacTor conTrolled by The sr55 musT be used
wiTh The in-delTa firing mode selecTed in The advanced menu.
The sr55 sTarTer does noT offer iers opTimizaTion when connecTed in-delTa.
do noT place bypass conTacTors around The sTarTer. The sTarTer has builT in bypass
conTacTors. if an exTernal bypass conTacTor is desired in order To allow emergency across
The line sTarTing in case of an sr55 failure, Then The load side of The sTarTer wiring musT be
disconnecTed in order To proTecT The sTarTer.