Banner SI-QM100 Locking Style 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.
Access to the Wiring Chamber
The wiring chamber is accessed via a cover plate that is held in place by four screws. A conduit adapter is supplied to convert the M20 x
1.5 thread to ½" x 14 NPT. An accessory cable gland that fits the M20 x 1.5 thread is available (see
on page 7).
Connection to a Machine
Four contacts are offered. Two are safety contacts that must be wired in series, and the other two are considered monitoring contacts
that may be used, if desired.
The contact between terminals 11 and 12 or 21 and 22 is a safety contact that is closed (i.e., it conducts) when the actuator is engaged.
The contact between terminals 13 and 14 is the associated actuator monitoring contact.
The contact between terminals 31 and 32 is a safety contact that is closed when the solenoid is in its locking state. The contact between
terminals 43 and 44 is the associated solenoid monitoring contact.
See the switching diagrams in the models table for contact state information.
As illustrated in
Figure 1. Switch Wiring to Safety Module
on page 5, the normally-closed safety contact (i.e., safety contacts that are
closed when the actuator is engaged and the solenoid is in its locking state) from each of two safety switches per interlock guard must
connect to a 2-channel safety module or safety interface to achieve a control reliable interface to the master stop control elements of a
machine. Examples of appropriate safety modules include 2-channel emergency stop (E-stop) safety modules and gate monitor safety
modules. Refer to
Figure 2. Switch Electrical Connections for SI-GM100xG Models
Figure 3. Switch Electrical Connec-
on page 5 for terminal connections.
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
2. provide a reset routine after closing the guard and returning the safety contacts to their closed position. This prevents the controlled
machinery from restarting by simply reinserting the safety switch actuators. This necessary reset function is required by ANSI B11
and NFPA 79 machine safety standards.
Use only positively driven, normally closed safety contacts from each switch for connection to the safety module. The normally open
contacts may be used for control functions that are not safety-related. A typical use is to communicate with a process controller. Refer to
the installation instructions provided with the safety modules for more information regarding the interface of the safety module to the
machine stop control elements.
Machine Safety Switches
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