Rockwell Automation Safety Function: Hinge Switch - Manual (Page 6)

6 Safety Function: Hinge Switch
Rockwell Automation Publication SAFETY-AT096A-EN-P – November 2013
Setup and Wiring
For detailed information on installing and wiring, refer to the publications listed in the
Additional Resources .
System Overview
The Ensign 3 hinge switch is a hinge-actuated safety interlock switch, designed to fit
at the hinge-point of guards. With its rotatable head, the versatile Ensign 3 switch
offers four mounting options.
The operation of the unit is achieved by the hinging action of the guard. The
actuation shaft is connected to the existing hinge pin and the degree of the operation
can be adjusted to suit the application via the adjustable cam in the switch head.
The switch includes the necessary safety-related functions, such as the
forced-guided contacts and the tamper-resistant mechanism, allowing machinery to
be safeguarded in compliance with the Machinery Directive. It is sealed to IP67 and
is available with an M16 conduit entry (with or without ½ in. NPT adapter) or
connector (choose 6-pin Micro (M12) or 5-pin Micro (M12) to ArmorBlock ®
Guard I/O™).
The pulsed outputs of the Guardmaster dual-input safety relay (GSR DI), terminals
S11 and S21, are run separately through the two E-stop contacts to the input
terminals (S12 and S22), respectively. This enables the relay to detect loose wires,
contact failed closed, shorts to 24V DC, short to GND, and cross-channel faults. The
relay responds to faults by opening its safety contacts (13…14 and 23…24) and
de-energizing the coils of K1 and K2. The relay cannot be reset until the fault is
removed. In some cases, the E-stop must be pressed and released before the relay
can be reset. After some faults, the relay must be power-cycled once the fault is
cleared before it can be reset.
The relay monitors itself for any internal faults. When a fault is detected, the relay
responds by opening its safety contacts (13…14 and 23…24) and de-energizing the
coils of K1 and K2. Some internal faults can be cleared by power-cycling the relay. In
other cases, the relay must be replaced.
The relay monitors the 100S contactors for welded contacts via two N.C. contacts in
series, one from each 100S, in the relay’s reset circuit. If a contact of a 100S is
welded, the N.C. contact is held open, breaking the reset circuit.