Unidrive M Modular Installation Guide
55
Issue Number: 2
6 Electrical Installation
Many cable management features have been incorporated into the
product and accessories, this chapter shows how to optimize them. Key
features include:
•
SAFE TORQUE OFF 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 function
The SAFE TORQUE OFF 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 M - Rectifier
If a rectifier other than Unidrive M Rectifier is used with
Unidrive M size 9D/10D, 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.
EN61800-5-1). This is to ensure L-E transients do not exceed
4 kV because there are no varistors installed in a D module,
and the insulation system from power to ground is designed
to category II.
Any non Control Techniques rectifier must be installed with
AC line fuses that correspond to those specified for the
Unidrive M rectifier. If this is not possible then DC fuses
should be specified for the Unidrive M size 9D/10D. 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
Unidrive M sizes 9 and 10
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
CAUTION
NOTE
Summary of Contents for 09201760D
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