Product Overview. Rockwell Automation Allen-Bradley 440GMZS20UNLJ, Allen-Bradley 440G-MZS20SNLJ, Allen-Bradley 440G-MZS20UNRJ, Allen-Bradley 440G-MZS20SNRJ
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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).
Rockwell Automation Publication 440G-UM004C-EN-P - August 2020 7
8
Chapter 1 Product Overview
Assembly Overview
Guard Locking on Power to Release Versions
With a Power to Release switch, the locking bolt extends when the guard is closed with the actuator inserted in the switch and a lock command is issued to the switch:
Table 2 - Lock Command
Mode
OSSD
Description
The lock signal (pin 5) is connected to 0V DC
GuardLink® A lock command is issued to the switch on the CLU signal from a GuardLink safety master.
IMPORTANT If power is removed from a Power to Release switch in the locked position, the locking bolt remains in its extended position (switch locked). Use the auxiliary release to unlock the switch.
ATTENTION: Under normal operating conditions, the locking bolt does not extend in the absence of the actuator. The only exception is when power is removed from a switch in the first 4 seconds of the start-up sequence. In this case, the bolt does extend. If the guard door is closed when the start-up sequence is interrupted, the guard door is locked. Use the auxiliary release to unlock the switch.
Guard Locking on Power to Lock Versions
With a Power to Lock switch, the locking bolt extends when the guard is closed with the actuator inserted in the switch and a lock command is issued to the switch:
Table 3 - Lock Command
Mode
OSSD
GuardLink
Description
The lock signal (pin 5) is connected to 24V DC
A lock command is issued to the switch on the CLU signal from a GuardLink safety master.
IMPORTANT If power is removed from a Power to Lock switch or a fault occurs while in the locked position, the bolt retracts and the switch unlocks.
ATTENTION: Under normal operating conditions, the locking bolt does not extend in the absence of the actuator. The only exception is when power is removed from a switch in the first 4 seconds of the start-up sequence. In this case, the bolt does extend. If the guard door is closed when the start-up sequence is interrupted, the guard door is locked. Use the auxiliary release to unlock the switch.
Actuator
LINK and DEVICE status indicators
Rockwell Automation Publication 440G-UM004C-EN-P - August 2020
Chapter 1 Product Overview
Product Selection
Table 4 - Catalog Number Explanation
440G-MZS 20 a
S b
N c
R d
J e a
Outputs (Safety/
Auxiliary)
Code Description
20 Two safety/no aux b
Actuator Code
Code Description
S Standard code
U Unique code c
Auxiliary Type
Code Description
N No auxiliary d
Lock Type
Code Description
R Power to Release
L Power to Lock e
Connection Type
Code Description
J M12 5-pin
Table 5 - Complete Switches, including Switch Body and Actuator
Type
Power to Release
Power to Lock
Actuator Coding
Standard (Low level to ISO 14119)
Unique (High level to ISO 14119)
Standard (Low level to ISO 14119)
Unique (High level to ISO 14119)
Escape Release
No
Table 6 - Spare Actuators
Description
Standard code actuator (Low level to ISO 14119)
Unique code actuator (High level to ISO 14119)
Cat No.
440G-MZS20SNRJ
440G-MZS20UNRJ
440G-MZS20SNLJ
440G-MZS20UNLJ
Cat. No.
440G-MZAS
440G-MZAU
Table 7 - Accessories
Description Cat. No.
L-shaped 440G-MZAM1
Actuator mounting bracket
Z-shaped 440G-MZAM2
Switch mounting bracket
Padlock accessory
440G-MZAM3
440G-MZAL
Rockwell Automation Publication 440G-UM004C-EN-P - August 2020 9
Chapter 1 Product Overview
Package Contents
The box includes the following components:
Description Photo
Switch Body
Actuator
Installation Instructions: publication 440G-IN018
10 Rockwell Automation Publication 440G-UM004C-EN-P - August 2020

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