DANGER - Blemo

Wiring
Installation Precautions
Good wiring practice requires the separation of control circuit wiring from all power (line and load) wiring. Power wiring to the motor must
have the maximum possible separation from all other power wiring. Do not run them in the same conduit. This separation reduces the
possibility of coupling electrical noise between circuits.
Follow these precautions when installing the SH31 soft starter:
• Voltage and frequency specifications for the input line must match the soft starter configuration.
• A disconnect switch must be installed between the input line and the soft starter.
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DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• Read and understand this manual before installing or operating the SH31. Installation, adjustment, repair, and maintenance must be
performed by qualified personnel.
• The user is responsible for compliance with all international and national electrical code requirements with respect to grounding of
all equipment.
• Many parts of this soft starter, including the printed circuit boards, operate at the line voltage. DO NOT TOUCH. Use only electrically
insulated tools.
• DO NOT touch unshielded components or terminal strip screw connections with voltage present.
• Before servicing the soft starter:
- Disconnect all power, including external control power that may be present.
- Place a “DO NOT TURN ON” label on all power disconnects.
- Lock all power disconnects in the open position.
• Install and close all covers before applying power or starting and stopping the soft starter.
Failure to follow these instructions will result in death or serious injury.
DANGER
HAZARD OF ELECTRIC SHOCK, EXPLOSION, OR ARC FLASH
• The solid state switches of the SH31 soft starter’s power circuit do not provide complete isolation from the AC line. Due to leakage
currents through the solid-state switches, hazardous voltages can be present on the soft starter load-side power circuit whenever
power is applied to the line side of the soft starter.
• Disconnect all power before servicing the soft starter or motor.
Failure to follow these instructions will result in death or serious injury.
• When using an isolation contactor, the contactor must close before or at the same time as the application of the soft starter run
command. If line power is not detected at the L1, L2, and L3 terminals of the soft starter within 500 ms of this run command, a Phase
Failure trip will occur.
• External overcurrent protection devices (OCPD), either fuses or a circuit breaker, must be installed on the line-side connections of
the SH31 soft starter. The maximum recommended OCPD rating, along with the associated soft starter short circuit withstand rating,
is listed on page 84.