Banner ES-FA-6G Safety Module - Manual (Page 10)

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 (for example, arc suppressors), or to install extra external insula-
tion 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 (for example, across the coils of exter-
nal safety relays), and never across the Safety Module’s output contacts (see WARNING, Arc Suppressors).
Auxiliary Monitor Contact/Solid-State Monitor Outputs Connection
The action of the auxiliary monitor contact, terminals 51-52, inversely "follows" the action of the safety outputs. Two additional solid-state
monitor outputs (at terminals Y32 and Y35) each are capable of switching up to 100 mA at 12- 24V dc. The output at terminal Y32 follows
the action of the output circuits (K1 and K2); the output at terminal Y35 opens (low signal) when there is a loss of power or a fault is
detected. These outputs are to be used only for nonsafety functions (typically, to communicate the status of the Safety Module to a
programmable logic controller). See the appropriate figure for wiring information.
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.
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.
Initial Checkout Procedure
CAUTION: Disconnect Power Prior to Checkout
Before performing the initial checkout procedure, make certain all power is disconnected from the
machine to be controlled.
Dangerous voltages may be present along the Safety Module wiring barriers whenever power to the ma-
chine control elements is ON. Exercise extreme caution whenever machine control power is or may
be present. Always disconnect power to the machine control elements before opening the enclo-
sure housing of the Safety Module.
1. Remove power from the machine primary control elements.
ES-UA-5A and ES-VA-5A E-Stop Safety Modules
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