Banner ES-UA-5A Instruction page 7

ES-UA-5A and ES-VA-5A E-Stop Safety Modules
WARNING . . . Multiple Safety Devices
When two or more safety devices are used, each device must be individually actuated, causing a STOP or
open-contact condition, then reset/rearmed and the Safety Module reset (if using manual reset mode). This
allows the monitoring circuits to check each device and its wiring to detect faults. Failure to test each device in-
dividually in this manner could result in undetected faults and create an unsafe condition which could result
in serious injury or death.
NOTE: The minimum amount of time for the Module to detect a STOP condition is 15 ms. This "recovery time" (OFF-
state) is required for the internal integrity tests to complete, allowing a reliable reset to occur. A lockout may occur
if the Module is cycled too quickly. To clear the lockout, the inputs must be re-cycled, meeting the minimum recovery
time requirements.
Connection of Safety Switches
The Safety Module may be used to monitor safety interlocking
switches that determine the position of a guard or gate. To
achieve Category 4 operation per ISO 13849-1 (EN 954-1), two
positive-opening safety switches must operate concurrently when
the guard or gate is opened (see figure at right).
The Safety Module verifies concurrent opening of two contacts
– one from each safety switch. Reset of the Safety Module is not
possible if one switch fails to open, or if a short circuit between
the safety interlocking switches occurs.
Connection of Reset Switch
The reset circuit switch can be any mechanical switch, such as a normally open momentary switch, or a two-position
key switch. The reset switch must be capable of reliably switching 12 to 30V dc at 20 to 50 milliamps. As shown in
the hookup drawings, the reset switch connects between Safety Module terminals S33 and S34.
The reset switch must be located outside of
and must be positioned so that any area of dangerous motion may be observed by the switch operator
during the reset procedure. See warning below.
WARNING . . . Reset Switch Location
The reset switch must be accessible only from outside, and in full view of, the hazardous area. Reset
switches must also be out of reach from within the safeguarded space, and must be protected against
unauthorized or inadvertent operation (e.g., through the use of rings or guards). If any areas are not visible from
the reset switch(es), additional means of safeguarding must be provided. Failure to do so could result in serious
bodily injury or death.
P/N 122365 rev. C Banner Engineering Corp. - Minneapolis, MN USA - www.bannerengineering.com
Figure 3: Hookup using contacts from two
safety switches
and not be accessible from
Tel: 763.544.3164
Safety Gate or Guard with end-of-travel stops and two
individually mounted Safety Interlocking Switches
OPEN
S11 S21
the area of dangerous motion,
S22 S12
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