Banner ES-FA-6G Safety Module - Manual (Page 8)

controlled by immediately removing electrical power to the machine and (when necessary) by applying braking to dangerous motion. This
stopping action is accomplished by removing power to the actuator of either MSC.
External Device Monitoring
To satisfy the requirements of Control Reliability (OSHA and ANSI), Category 3 and 4 of ISO 13849-1 (EN 954-1), the master stop control
elements (MSCs) must each offer a normally closed, forced-guided (mechanically linked) monitor contact. Connect one normally closed
monitor contact from each master stop control element as shown in the single-channel wiring diagrams.
In operation, if one of the switching contacts of either MSC fails in the energized condition, the associated monitor contact will remain
open. Therefore, it will not be possible to reset the Safety Module. If no MSC-monitor contacts are monitored, a jumper must be installed
as shown in the wiring diagrams. It is the user's responsibility to ensure that any single failure will not result in a hazardous condition and
will prevent a successive machine cycle.
Overvoltage Category II and III Installations (EN 50178 and IEC 60664-1)
The Safety Module is rated for Overvoltage Category III when voltages of 1V to 150V ac/dc are applied to the output relay contacts. It is
rated for Overvoltage Category II when voltages of 151V to 250V ac/dc are applied to the output relay contacts and no additional precau-
tions are taken to attenuate possible overvoltage situations in the supply voltage. The Module can be used in an Overvoltage Category III
environment (with voltages of 151V to 250V ac/dc) if care is taken either to reduce the level of electrical disturbances seen by the Module
to Overvoltage Category II levels by installing surge suppressor devices (e.g., arc suppressors), or to install extra external insulation in
order to isolate both the Safety Module and the user from the higher voltage levels of a Category III environment.
For Overvoltage Category III installations with applied voltages from 151V to 250V ac/dc applied to the output contact(s): the
Safety Module may be used under the conditions of a higher overvoltage category where appropriate overvoltage reduction is provided.
Appropriate methods include:
• An overvoltage protective device
• A transformer with isolated windings
• A distribution system with multiple branch circuits (capable of diverting energy of surges)
• A capacitance capable of absorbing energy of surges
• A resistance or similar damping device capable of dissipating the energy of surges
When switching inductive ac loads, it is good practice to protect the Safety Module outputs by installing appropriately-sized arc suppres-
sors. However, if arc suppressors are used, they must be installed across the load being switched (e. g., across the coils of external
safety relays), and never across the Safety Module’s output contacts (see WARNING, Arc Suppressors).
Auxiliary Monitor Contact (Model ES-FA-11AA Only)
The action of the auxiliary monitor contact, terminals 31-32, inversely "follows" the action of the safety outputs. The 31-32 auxiliary moni-
tor contact is to be used only for control functions that are NOT safety-related. A typical use is to communicate the status of the Safety
Module output to a programmable logic controller (PLC).
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: 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 will create an unsafe condition which could
result in serious injury or death.
ES-FA-9AA and ES-FA-11AA E-Stop Safety Modules
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