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8
S611 Soft Starter
MN03902011E—May 2012 www.eaton.com
Current Transformer Installation
When securing the Current Transformers (CTs) onto the T1,
T2, and T3 bus bars of the soft starter, correct orientation of
the CT must be observed to ensure proper operation of the
soft starter. Each CT is marked with a symbol “IX” adjacent
to the leads. This symbol shown in the figure below indicates
the line side (or voltage source side) of the device.
CT Orientation
Lug Installation—Mechanical
The following procedures are to be followed during
mechanical lug installation:
●
The lug is mounted under the soft starter bus bar as
shown
●
Do Not overtorque lug attachment hardware. Damage to
the supports may result
●
The lug is to be supported with a wrench or other suitable
device to prevent excessive side loads on the bus bar
supports that may result in damage to the supports
Lug Mounted Under Soft Starter Bus Bar
Power Wiring
Using the wiring diagram on this page and the table on
Page 9
as guides, connect the line and motor wiring in
accordance with appropriate local and national codes.
Note:
To provide optimum motor protection the line and
motor power wiring should be tightly bundled and run
perpendicular to the orientation of the S611.
WARNING
Hazardous voltage can cause electric shock and burns.
To avoid shock hazard, disconnect all power to the
controller, motor or other control devices before any
work is performed on this equipment. Failure to do so
will result in personal injury, death or substantial
property damage.
Do not apply a disconnect device on the output of the
S611 soft starter unless a means to turn off the soft
starter when disconnect switch is open is used. Opening
disconnect while the soft starter is operating may cause
a malfunction. Closing disconnect switch while the soft
starter is operating will result in a soft starter failure and
potential equipment damage and personnel hazard.
Note:
Short-circuit protection must be applied on the line
side of the soft starter.
The S611 is wired only in an inline connected configuration.
By factory default, the S611 is to be connected with an ABC
phase rotation on the incoming power wiring. If the motor
turns in the incorrect direction upon energization, exchange
two phases at the motor terminal box or at the output
terminals of the soft starter. Changing the input wiring may
cause a voltage phase reversal trip.
If the input phase sequence to the S611 cannot be changed,
the incoming phase sequence protection will need to be set
to ACB. Setting ACB as the incoming phase sequence
causes the S611 to recognize the reverse direction of phase
rotation. Phase rotation monitoring may be turned off by
adjusting the phase sequence parameter in the protection
mode list.
!
IMPORTANT
A reversing contactor must never be switched while the soft
starter is operating. In order to gain the full benefit of the
S611 with a reversing contactor, the S611 needs to be OFF
when switching the direction of the motor. The soft starter
settings must account for catching a motor spinning in the
opposite direction upon soft restarts. The time required for
slowing the motor to a stop and then ramping up to speed in
the opposite direction adds to the overall starting time. This
condition will also impact the overload protection setting.
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Содержание S611
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