Banner SI-QM100 Locking Style Switches - Manual (Page 7)

Machine Safety Switches –
SI-LS42 Series Locking Style Switch
P/N 60099 rev. D
Banner Engineering Corp. • Minneapolis, MN U.S.A.
www.bannerengineering.com • Tel: 763.544.3164
WARNING . . .
It must not be possible for
personnel to reach any
hazard point through an opened guard
(or any opening) before hazardous
machine motion has completely stopped.
Please reference OSHA CFR 1910.217
and ANSI B11 standards (see page 2) for
information on determining safety distances
and safe opening sizes for your guarding
devices.
Connection to a Machine
Four contacts are offered. Two are safety contacts which must be wired in series, and
the other two are considered monitoring contacts which may be used, if desired.
The contact between terminals 11 and 12 or 21 and 22 is a safety contact which 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 which 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 on pages 3 and 4 for contact state information.
Solenoid voltage connects to terminals E1 (+) and E2 (-).
As illustrated in Figure 6, the normally-closed safety contacts (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 in order 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.
Two functions of the safety module or safety interface are:
1. To 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. To 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.