Banner ES-UA-5A Manual page 3

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A1 A2 B1 B2 S11 S12
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A1 A2 B1 B2
POWER
FAULT
CH 1
K2
K1
CH 2
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Figure 1. ES-UA-5A and ES-VA-5A
Status Indicators and Terminal
Locations
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E-Stop Safety Module
The purpose of an Emergency Stop Safety Module (E-Stop Safety Module) is to increase
the control reliability of an emergency stop circuit. As indicated in Figures 2 and 3, the
models ES-UA-5A and ES-VA-5A E-Stop Safety Modules are designed to monitor a
1-channel or 2-channel E-stop switch. A 2-channel E-stop switch has two electrically
isolated contacts.
EN 954-1 Safety Categories
Both contacts of a 2-channel E-stop switch are monitored by the Safety Module. If either
input is short-circuited, the Safety Module cannot be reset, and the controlled machinery
cannot be restarted, following actuation of the E-stop switch. Two-channel E-stop
switches used with this Safety Module are suitable for Safety Category 4 applications, per
European Standard ISO 13849-1 (EN 954-1), of which Category 4 is the highest safety
category.
Use of a 1-channel E-stop switch provides no input redundancy, and no ability for the
Safety Module to monitor for input short circuits. One-channel E-stop switches used with
this Safety Module are generally suitable only for Safety Category 2 applications, per
ISO 13849-1 (EN 954-1).
IEC/EN 6004-1 and NFPA 79 Functional Stop Categories
In a functional Category 0 emergency stop circuit, the opening of either of the two E-stop
switch contacts (or the one contact, if configured to 1-channel) immediately removes
electrical power from the machine control elements, which react to stop hazardous
machine motion and/or other machine hazards. This redundancy of stopping control
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emergency stop circuit.
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The output of the E-Stop Safety Module consists of four redundant output switching
channels, each of which is the series connection of two forced-guided relay contacts that
are internally monitored (K1 and K2 in Figures 4 and 5). If the Module detects a failure,
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such as a welded output relay contact, all outputs are disabled and cannot be reset. The
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K1
four switching output circuits of the E-Stop Safety Module are rated for up to 250V ac at
K2
up to 6 amps.
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The E-Stop Safety Module also provides a necessary reset function. U.S. and
international standards require that a reset/restart routine be performed after returning the
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E-stop switch to its closed-contact position. This prevents the controlled machinery from
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restarting by simply closing the E-stop switch. The Module may also be configured for
automatic reset (see Figures 4 and 5). The automatic reset mode is useful for some
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automated processes. However, when automatic reset is used, an alternate means
must be established to require a reset/restart routine after the E-stop switch is
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returned to its closed contact position (see WARNING on page 8).
This E-Stop Safety Module complies with the following design standards:
UL 991 Tests for Safety Related Control Employing Solid-State Devices
EN 418 Emergency Stop Equipment—Functional Aspects, Principles for Design
EN 954-1 Safety of Machines: Safety Related Parts of Control Systems
Part 1: General Design Directives (Safety Category 4)
The Safety Module has indicators for input power, fault, and output relay contact status
(K1 and K2); see Figure 1. There are no adjustments and no user-serviceable parts. See
page 10 for information regarding repair service.
– Models ES-UA-5A and ES-VA-5A
Overview