Safety
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Electrical
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64
Unidrive SPM User Guide
www.controltechniques.com Issue Number: 3
6 Electrical Installation
Many cable management features have been incorporated into the
product and accessories, this chapter shows how to optimise them. Key
features include:
•
SAFE TORQUE OFF (SECURE DISABLE) function
•
Internal EMC filter
•
EMC compliance with shielding / grounding accessories
•
Product rating, fusing and cabling information
•
Brake resistor details (selection / ratings)
The power supply to all modules in a multi-module system should be
applied at the same time, to ensure the drive powers-up correctly.
Otherwise the drive may power-up with a hardware fault (HF) trip code.
Electric shock risk
The voltages present in the following locations can cause
severe electric shock and may be lethal:
•
AC supply cables and connections
•
DC and brake cables, and connections
•
Output cables and connections
•
Many internal parts of the drive, and external option units
Unless otherwise indicated, control terminals are single
insulated and must not be touched.
Isolation device
The AC supply must be disconnected from the drive using
an approved isolation device before any cover is removed
from the drive or before any servicing work is performed.
STOP function
The STOP function does not remove dangerous voltages
from the drive, the motor or any external option units.
SAFE TORQUE OFF (SECURE DISABLE) function
The SAFE TORQUE OFF (SECURE DISABLE) function
does not remove dangerous voltages from the drive, the
motor or any external option units.
Stored charge
The drive contains capacitors that remain charged to a
potentially lethal voltage after the AC supply has been
disconnected. If the drive has been energized, the AC
supply must be isolated at least ten minutes before work
may continue.
Normally, the capacitors are discharged by an internal
resistor. Under certain, unusual fault conditions, it is possible
that the capacitors may fail to discharge, or be prevented
from being discharged by a voltage applied to the output
terminals. If the drive has failed in a manner that causes the
display to go blank immediately, it is possible the capacitors
will not be discharged. In this case, consult Control
Techniques or their authorized distributor.
Equipment supplied by plug and socket
Special attention must be given if the drive is installed in
equipment which is connected to the AC supply by a plug
and socket. The AC supply terminals of the drive 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 drive must be used (e.g. a latching relay).
Permanent magnet motors
Permanent magnet motors generate electrical power if they
are rotated, even when the supply to the drive is
disconnected. If that happens then the drive will become
energized through its motor terminals.
If the motor load is capable of rotating the motor when the
supply is disconnected, then the motor must be isolated from
the drive before gaining access to any live parts.
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
Use of rectifiers other than Unidrive SPMC/U
If a rectifier other than Unidrive SPMC/U is used with Unidrive
SPMD, then it must be installed with line to ground varistors
which are capable of reducing overvoltage transients from
category III to values of category II. (ref. EN61800-5-2). This
is to ensure L-E transients do not exceed 4kV because there
are no varistors installed in a D module and the insulation
system from power to ground is designed to category II.
Use of rectifiers other than Unidrive SPMC/U
Any non Control Techniques rectifier must be installed with
AC line fuses that correspond to those specified for the
Unidrive SPMC/U. If this is not possible then DC fuses should
be specified for the Unidrive SPMD. This is to ensure validity
of the safety testing carried out to complete the safety file and
for UL certification, especially in the event of a short circuit
bus cap in the DC bus.
0V control connections on both SPMA and SPMD drives are
internally earthed and cannot be disconnected. Ensure that
there is adequate equipotential bonding between parts of a
system with interconnected control wiring.
WARNING
WARNING
CAUTION
NOTE
