Banner Compact Plastic Style Safety Interlock Switches User Manual
Page 4
CAUTION: Electrical Installation
Two safety switches must be used for each interlock guard to achieve control reliability or Safety
Category 4 (per ISO 13849-1, EN 954-1) of a machine stop circuit. Use of only one safety switch per
interlock guard is not recommended.
In addition, normally-closed safety contacts from each of the two safety switches should be connected to
the two separate inputs of a 2-channel safety module or safety interface. This is required to provide moni-
toring for safety switch contact failure, and to provide the necessary reset routine, as required by IEC
60204-1 and NFPA 79 machine safety standards.
WARNING: Series Connection of Safety Interlock Switches
Monitoring multiple guards with a series connection of safety interlock switches may result in a failure be-
ing masked or not detected at all. When such a configuration is used, periodic checks must be performed
regularly to verify proper operation. All failures must be immediately corrected ( e.g. immediately replacing
a failed switch), or the loss of the safety stop signal or an inappropriate reset could lead to serious injury or
death.
Access to the Wiring Chamber
The wiring chamber is accessed via the hinged door (see
on page 3). The SI-LS83 switches have a wire entrance of M16 x 1.5.
The SI-LS100 models have a wire entrance of M20 x 1.5. All models come with an adaptor to convert to 1/2"–14 NPT. M16 x 1.5 and
M20 x 1.5 cable glands are available, see
Connection to a Machine
As illustrated in
Figure 1. Switch Wiring to Safety Module
on page 4, a normally closed safety contact (i.e., a safety contact that is
closed when the actuator is engaged) from each of two safety switches per interlocked guard must connect to a 2-channel safety module
or safety interface in order to achieve a control reliable interface to the master stop control elements of a machine. Examples of appropri-
ate safety modules include 2-channel emergency stop (E-stop) safety modules and gate monitor safety modules.
Safety
Switch
#1
Safety
Switch
#2
Input
Channel
#1
Input
Channel
#2
2-channel Safety Module
(2-channel E-stop Module
2-channel Gate Monitor Module, etc.)
Single gate
or guard
Figure 1. Switch Wiring to Safety Module
NOTE: Refer to the installation instructions provided with the safe-
ty module for information regarding the interface of the safety mod-
ule to the machine stop control elements.
Connect two redundant safety switches per interlock guard to an
appropriate 2-channel input safety module.
Two functions of the safety module or safety interface are to:
1. provide a means of monitoring the contacts of both safety switches for contact failure, and to prevent the machine from restarting if
either switch fails; and
Limit-Switch Style Machine Safety Switches
4
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