User's Manual

Rockwell Automation Publication 440G-UM004C-EN-P - August 2020 7
Chapter 1
Product Overview
Guardmaster 440G-MZ
Safety Switch Overview
This 440G-MZ Guardmaster® safety switch locks a guard door in the closed
position and does not release it until the hazardous machine functions that are
covered by the guard are in a safe condition. The safety control system allows
the hazardous machine functions to operate only when the guard is closed and
locked.
The locking bolt drive mechanism and logic confirm that the locking bolt is
allowed to extend only when the corresponding actuator is detected within
range.
RFID technology enables high precision operation while meeting the
requirements to prohibit actuator substitution as described in ISO 14119. The
440G-MZ safety switches are classified as Type 4 interlocking devices with
guard locking and the unique coded actuators are classified as having a high
level of coding according to ISO 14119.
The 440G-MZ safety switch features two OSSD outputs or a single-wire safety
output when connected in a GuardLink® system. These safety outputs are
enabled only when the locking bolt is sensed in its extended position. This
action only happens when the guard is both closed and locked.
The locking bolt drive mechanism uses a bi-stable solenoid. As a result, the
switch consumes little electrical power, with peak currents occurring (only
briefly) on startup and after each movement of the locking bolt.
Because of its bi-stable drive, not only does the device consume minimal
power, but it also does not produce heat while it is locked or unlocked.
Although the locking bolt drive uses a bi-stable solenoid, the device logic and
functionality are configured to replicate the functionality of a Power to Release
or Power to Lock solenoid-operated switch (depending on type).