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Safety
Rating
Mechanical
Information
Data
Installation
1.8
Electrical installation
1.8.1
Electrical shock risk
The voltages present in the following locations can cause severe electric shock and may be lethal:
AC supply cables and connections
Output cables and connections
Many internal parts of the starter, and external option units
The AC supply must be disconnected from the starter using an approved isolation device before any cover is removed from the
starter or before any servicing work is performed.
Models IS3x0255B to IS4x1000B, IS4x0360N to IS561600N: The busbar and heatsink are live while the unit is operating (starting,
running or stopping). If the starter is installed without a main contactor, the busbar and heatsink are live whenever mains voltage is
connected (including when the starter is ready or tripped).
1.8.2
Power-up procedure
Always apply control voltage before (or with) mains voltage.
IS1x0023B to IS1x0105B: After transportation, mechanical shock or rough handling there is a possibility that the bypass contactor
may have latched into the on state. To prevent the possibility of the motor starting immediately, on first commissioning or operation
after transportation, always ensure that the control supply is applied before the power, so that the contactor state is initialised.
1.8.3
STOP function
The STOP function does not remove dangerous voltages from the starter, the motor or any external option units.
1.8.4
Stored charge
The starter contains capacitors that remain charged to a potentially dangerous voltage after the AC supply has been disconnected.
If the starter has been energised, the AC supply must be isolated at least two minutes before work may continue.
Normally, the capacitors are discharged by an internal resistor. Under certain, unusual fault conditions, the capacitors may fail to
discharge. Do not assume that the capacitors have discharged. To protect the user and the equipment, take due care when carrying
out any work on the starter.
1.8.5
Equipment supplied by plug and socket
The control supply terminals of the starter are connected to the internal capacitors through rectifier diodes which are not intended to
give safety isolation. If the plug terminals can be touched when the plug is disconnected from the socket, a means of automatically
isolating the plug from the starter must be used (e.g. a latching relay).
1.8.6
Short circuit
Digistart IS soft starters are not short circuit proof. After severe overload or short circuit, the operation of the soft starter should be
fully tested by an authorised service agent.
1.8.7
Auto-start
Use the auto-start feature with caution. Read all the notes related to auto-start before operation.
6
Electrical
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Installation
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Data
Digistart IS User Guide
Issue: 4
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