Banner Universal Input Safety Modules - Manual (Page 6)

It is recommended that in all circumstances the installation of the Safety Module and its associated safety input devices are installed to
eliminate or minimize the possibility of failures and faults that could result in the loss of the safety function(s). Methods to eliminate or
minimize the possibility of these failures include, but are not limited to:
• Physically separating interconnecting control wires from each other and from secondary sources of power.
• Routing interconnecting control wires in separate conduit, runs, or channels.
• Locating all elements (modules, switches, and devices under control) within one control panel, adjacent to each other, and directly
connected with short wires.
• Properly installing multi-conductor cabling and multiple wires through strain-relief fittings. (Over-tightening of a strain-relief can cause
short circuits at that point.)
• Using positive-opening components as described by IEC 60947-5-1 that are installed and mounted in a positive mode.
• Periodically checking the functional integrity / safety function and training operators, maintenance personnel, and others associated
with the operation of the machine to recognize and immediately correct such failures.
If you have any questions about your intended use, please contact a Banner applications engineer.
WARNING: Wiring of Arc Suppressors
If arc suppressors are used, they MUST be installed as shown across the actuator coil of the stop
control elements (MSCs or MPCEs). NEVER install suppressors directly across the output contacts
of the Safety Device or Module. It is possible for suppressors to fail as a short circuit. If installed directly
across the output contacts, a short-circuited suppressor creates an unsafe condition which may re-
sult in serious injury or death.
WARNING: Interfacing MSCs
NEVER wire an intermediate device(s) (for example, PLC, PES, PC) between the Safety Module outputs
and the Master Stop Control Element it switches in such a manner that in the event of a failure there is a
loss of the safety stop command, OR in such a manner that the safety function can be suspended, overrid-
den, or defeated, unless accomplished with the same or greater degree of safety.
Whenever forced-guided, mechanically linked relays are added as intermediate switching devices, a nor-
mally closed (N.C.) forced-guided monitor contact from each relay must be added to the series feedback
loop between Safety Module terminals S31 and S32.
WARNING: Multiple Switching Devices
Whenever two or more devices are connected to the same safety module (controller):
• Contacts of the corresponding pole of each switch must be connected together in series. Never
connect the contacts of multiple switches in parallel. Such a parallel connection defeats the switch
contact monitoring ability of the Module and creates an unsafe condition which may result in serious
injury or death.
• Each device must be individually actuated (engaged), then released (or re-armed) and the safe-
ty module reset. This allows the module to check each switch and its wiring to detect faults.
This check must be performed during the prescribed checkouts. Failure to test each device individually
in this manner may result in undetected faults and create an unsafe condition which may result in
serious injury or death.
UM-FA-xA Universal Input Safety Modules
6 www.bannerengineering.com - tel: 763-544-3164 P/N 141249_web
Rev. E