External Device Monitoring - Banner ES-GA-5A Manual

S11 S21
Figure 3. Series connection of multiple
E-stop switches
Safety Interlock
Switch #1
Safety Interlock
Switch #2
S11 S21
S22 S12
Figure 4. Hookup using contacts from
two safety switches
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E-Stop Safety Module
Connection of E-Stop Switch
Connect the poles of the E-stop switches as shown in Figure 2. The switches are shown
in the "armed" position with both contacts closed. Multiple E-Stop switches connected
to one E-stop Safety Module must be series connected (see Figure 3 and the warning
on page 8).
S22 S12
Connection of Safety Switches
Model ES-..A-5A may be used as a safety gate monitoring module. To achieve Category 4
operation per EN 954-1, two positive-opening safety switches operate concurrently when
the gate or guard is opened (see Figure 4).
The ES-..A-5A verifies concurrent opening of two contacts – one from each safety switch.
Reset of the ES-..A-5A is not possible if one switch fails to open, or if a short circuit
Safety gate
between the safety switches occurs.
or guard
Please contact the Banner Factory Applications Group at the numbers listed on the last
page to discuss your intended use.

External Device Monitoring

To satisfy the requirements of Safety Category 4 of EN 954-1, the Master Stop Control
Elements must each offer a normally closed, forced-guided monitor contact. One
normally closed monitor contact from each Master Stop Control Element is wired in
series to the S31-S32 feedback input (see Figure 2). In operation, if one of the switching
contacts of either master stop control element fails in the shorted condition, the
associated monitor contact will remain open. Therefore, it will not be possible to reset the
E-Stop Safety Module. If no MSC-monitor contacts are monitored, a jumper must be
installed between terminals S31 and S32 (see Figure 2). It is the responsibility of the
user to ensure that any single failure will not result in a hazardous condition and
will prevent a successive machine cycle.
Connection to the Machine to be Controlled
The hookup diagrams (Figure 2) show a generic connection of the E-Stop Safety
Module's four redundant output circuits to Master Stop Control Elements MSC1 through
MSC4. A Master Stop Control Element is defined as an electrically powered device,
external to the E-Stop 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 (reference ANSI B11.19, section 5.2: "Stop Control"). This
stopping action is accomplished by removing power to the actuator coil of either Master
Stop Control Element.
– Models ES-GA-5A and ES-HA-5A