Banner Universal Input Safety Modules - Manual (Page 10)

WARNING: Reset Routine Required
U.S. and international standards require that a reset routine be performed after clearing the cause of a
stop condition (for example, arming an E-stop button, closing an interlocked guard, etc.). Allowing the
machine to restart without actuating the normal start command/device can create an unsafe condi-
tion which may result in serious injury or death.
NOTE: The minimum amount of time required for the Module to be in a STOP or OFF condition is 250 milli-
seconds. This “recovery time” (OFF-state) is required for the internal circuitry of the Safety Module to normal-
ize, allowing a reliable reset to occur. A lockout will occur if the Module is cycled too quickly. To clear the
lockout, re-cycle the Module, meeting the minimum OFF time requirements.
Connection to the Machine to be Controlled
The machine hookup diagram shows a generic connection of the Safety Module's redundant output circuits to the master stop control
elements (MSCs). An MSC is defined as an electrically powered device, external to the Safety Module, which stops the machinery being
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 (EN954-1), 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 in series to S33-S34 in Auto Reset mode and to S11-S33 in Manual Reset mode
(see the hookup configurations in
Safety Input Device Hookup Options on page 5).
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 the hookup configurations in
Safety Input Device Hookup Options on page 5. 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 (EN50178 and IEC60664-1)
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 (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).
UM-FA-xA Universal Input Safety Modules
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