Installation
S801+ Soft Starter MN03900002E—November 2012 www.eaton.com 19
Control Wiring Application Notes
CAUTION
Only apply 24 Vdc to the control terminal block. Control
wiring is 22–12 AWG (0.33–4.0 mm
2
). Failure to follow this
caution may result in damage to the control circuit.
1. Connect 24 Vdc Supply positive to Terminal “+” using a
minimum wire of 14 AWG (2.5 mm
2
).
2. Connect 24 Vdc Supply negative to Terminal “–“ using a
minimum wire of 14 AWG (2.5 mm
2
).
3. 24 Vdc Control voltage must not exceed 30 Vdc to
prevent hardware damage.
4. 24 Vdc Control voltage must not fall below 18 Vdc.
Using a Supplemental Line Contactor
In some installations, it may be necessary to use an
electromagnetic contactor in series with the soft starter. In
this case, it is recommended that the contactor be placed on
the load side of the soft starter. The contactor must be
closed prior to starting the soft starter and remain closed
until the Soft Starter has been stopped to ensure proper soft
starter and system operation.
If an electromagnetic contactor is used on the line side of the
soft starter, additional control circuitry must be supplied by
the user when using edge control to ensure the line power is
supplied to the soft starter before control power is applied. If
this sequence is not followed, the soft starter will fault on
either a phase loss or zero voltage-crossing fault.
If it is desired to place an electromagnetic contactor on the
line side of the soft starter, Eaton recommends using level
sense option. With level sense, no additional control circuitry
is required. A start can be completed when the line power is
supplied to the unit after the control power, providing the
Reset Mode parameter is set to AUTO and the unit has a
Ready light status with 24 Vdc on the Start terminal.
If the AUTO Reset Mode setting is used, CAUTION must
be exercised to assure that any restart occurs in the safe
manner.
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