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E-Stop Safety Modules with Fixed Delay –
Connection of Safety Switches
Models ES-TN-1H.. may be used as a safety gate monitoring module. To achieve Safety
Category 4 operation per EN954-1, two individually mounted, positive-opening safety
switches that operate concurrently when the gate or guard is opened must be used (see
Figure 4).
The ES-TN-1H.. verify 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 occurs between the safety switches or to dc common or to +24V.
Please contact the Banner Factory Applications Group at the numbers listed on the last
page to discuss your intended use.
Connection of Reset Switch (Manual Monitored Reset)
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 18-30V dc at 10-25 mA. As shown in Figure 3, the Reset switch
connects between terminals X1 and X2 of the Safety Module. A reset will occur after
the Reset button goes from open, to closed, and back to open state.
The Reset switch must be located outside of – and not be accessible from – the
area of dangerous motion, and must be positioned so that any area of dangerous
motion may be observed by the switch operator during the Reset procedure.
External Device Monitoring (EDM)
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. For
2-channel monitoring, one normally closed monitor contact from one Master Stop
Control element, controlled by one of the immediate output contacts from the E-Stop
Safety Module, is wired in series to one normally closed monitor contact from one
Master Stop Control element, controlled by one of the delayed output contacts from
the E-Stop Safety Module, to input X3-X4. The same configuration (one immediate N.C.
series connected to one delayed N.C.) is wired to X5-X6 (Figure 3). In operation, if one
of the switching contacts of any Master Stop Control (MSC) element fails in the shorted
condition, the associated monitor contact will remain open, making reset of the E-Stop
Safety Module impossible.
There is no specific feedback input to which the immediate MSCs must be connected.
However, two immediate contacts (from two MSCs) or two delayed contacts (from two
MSCs) should not be connected to the same input. If 1-Channel Monitoring is selected,
input X5-X6 must be jumpered, configured for 1-Channel Monitoring (see Figure 3) and
all monitoring contacts must be wired in series to X3 and X4.
Connection to the Guarded Machine
The hookup diagram (Figure 3) shows 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. This stopping action is
accomplished by removing power to the actuator coil of any Master Stop Control
Element.
8
P/N 61061 rev. A
Models ES-TN-1H..
Safety Interlock
Switch #1
Safety Interlock
Switch #2
S11 S21
Figure 4. Hookup using contacts from two
safety switches
Banner Engineering Corp.
www.bannerengineering.com • Tel: 763.544.3164
Safety
gate
or
guard
S22
S12
Minneapolis, MN U.S.A.
•
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