User's Manual

Rockwell Automation Publication 440G-UM004C-EN-P - August 2020 13
Chapter 3
Installation
General Considerations
Installation must be in accordance with the present manual and implemented
by qualified personnel exclusively. The 440G-MZ safety switch is intended to be
part of the safety-related control system of a machine.
Correct Use
Review the following requirements and guidelines for proper use of the safety
switch to achieve optimal performance.
• The 440G-MZ safety switch is designed for use on medium- and full-
sized guards including guards where whole-body access to the
safeguarded area is possible.
• The switch is not to be used as a mechanical stop. Check that a separate
door stop is used.
• A separately mounted latch (for example, magnetic or mechanical) is
recommended to maintain proper alignment of the actuator. The
locking bolt must be free to enter and withdraw from the actuator
without binding.
• Use appropriate screws, bolts, or nuts that are fitted by tools to mount
the switch and actuator to avoid tampering.
• Do not over torque the mounting hardware.
• A minimum distance of 100 mm (3.94in.) must separate adjacent
switches, see Pair Proximity on page 14
.
• The 440G-MZ safety switch is designed for use in a NEC Class 2 circuit.
Connect the 440G-MZ safety switch to a dedicated Class 2 power supply
or use electronic circuit protection (for example, 1692-ZRCLSS) to
achieve NEC Class 2 compliance.
ATTENTION: Before installation, a thorough risk assessment must be performed to
determine whether the specifications of this device are suitable for all foreseeable
operational and environmental characteristics of the application.
A functional test of the system is necessary to validate that it works as expected
(see Functional Testing on page 17
).
Guard locking switches that use the Power to Lock principle (Cat. No.
440G-MZS20*NLJ*) must only be used after a risk assessment has shown that the
use of a Power to Release principle (Cat. No. 440G-MZS20*NRJ*) is inappropriate.
This assessment is necessary since the guard can be immediately opened after a
loss of power supply or upon deactivation of the unlocking signal.
ATTENTION: For the switch, actuator, and actuator mounting bracket:
• Only use the designated mounting holes.
• Never drill or use to support other structures such as a conduit, cable ways, or other
hardware.