6
Digistart D3: User Guide
Issue: G
1.6 Adjusting parameters
Some parameters have a profound effect on the operation of the starter. They must not be altered without careful
consideration of the impact on the controlled system. Measures must be taken to prevent unwanted changes due to
error or tampering.
1.7 Electrical Installation
1.7.1 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.
WARNING – ELECTRICAL SHOCK HAZARD
Models D3-0500-B~D3-1600-N: The busbar and heatsink must be treated as live whenever the unit has
mains voltage connected (including when the starter is tripped or waiting for a command).
1.7.2 Power-up procedure
Always apply control voltage before (or with) mains voltage.
D3-0023-B to D3-0105-B: 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.
1.7.3 STOP function
The STOP function does not remove dangerous voltages from the starter, the motor or any external option units.
1.7.4 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.
1.7.5 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).
1.7.6 Short circuit
The Digistart D3 is not short circuit proof. After severe overload or short circuit, the operation of the Digistart D3
should be fully tested by an authorised service agent.
1.7.7 Auto-start
Use the auto-start feature with caution. Read all the notes related to auto-start before operation.
