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M’Ax Installation Guide
17
Issue Number: 6
www.controltechniques.com
2.28
Precautions for making power
connections
Electric 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 drive
•
An auxiliary back-up supply when connected in
addition to the AC supply.
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.
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 energised, the AC
supply must be isolated at least five minutes before work
may continue.
AC supply 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 do not give 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 (eg. a latching relay).
STOP function
The STOP function does not remove dangerous voltages
from the drive.
Safety ground connection
The ground loop impedance must conform to the
requirements of local safety regulations.
The electrical safety of the installation depends on the
correct fitting and use of the ground bracket supplied
with the drive. All ground connections to the drive must
be made to this ground bracket.
The ground bracket must be grounded by a connection
capable of carrying the prospective fault current until the
protective device (fuse, etc) disconnects the AC supply.
The ground connections must be inspected and tested at
appropriate intervals.
2.29
Terminal sizes and tightening torques
To avoid a fire hazard and maintain validity of the UL
listing, adhere to the specified tightening torques for the
power and ground terminals. Refer to the following
tables.
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
Unit
Power terminals
Ground terminal
Size
Type
Torque
Size
Type
Torque
Drive
Plug-in
terminal
block
0.5N.m
4.4lb.in
M5 stud
2N.m
17.7lb.in
RFI filter
Screw
terminals
0.7N.m
6.2lb.in
Screw
terminals
0.7N.m
6.2lb.in
Torque tolerance
±10%
WARNING
