User's Manual

Rockwell Automation Publication 440G-UM004C-EN-P - August 2020 33
Chapter 7 Application Examples
Wire to GLT Safety Relay
The GLT safety relay is designed to operate with PTR switches. To use a PTL
switch, you must use an interposing relay on the lock command at terminal 51
of the GLT safety relay.
In this example shown in Figure 13
, the GLT safety relay sends an immediate
command to the drive to turn OFF. After 8 seconds, the GLT safety relay turns
off its safety outputs and unlocks the gate. The risk assessment must
determine adequate time delay for the machine to achieve a safe state before
unlocking the gate.
Figure 13 - GLT and 440G-MZ Safety Switch Schematic
Circuit status as shown: The gate is open and unlocked. The motor is off. The
GLT safety relay is ready for reset. The GLT safety relay has a Logic setting of
3: (Category 1 Stop), a Range setting of 4 (10 seconds) and a Time setting of 8
(80%). The Y32 output turns OFF immediately; 8 seconds later, the safety
outputs turn OFF.
The safety outputs (14 and 24) and the single wire safety output (L11) are OFF
and the auxiliary output (Y32) is ON.
Starting
Close the gate. Press Reset and Gate Lock Request to lock the gate and turn on
the GLT safety outputs. Press Start to turn the motor ON.
Blue (Gnd)
Brown (+24)
24V DC Com
M
Gate
Unlock
Request
Reset and
Gate Lock
Request
GLT
440R-GL2S2T
A2S12 S22
B2
L61
51
L12
A145S 44S21S11S
L11
Y32
LOGIC
TIMERANGE
Gate control
power supply
Gate control
circuit
S1
S2
1 Stop
PowerFlex
525
2 Start
4 Gnd
11 +24V DC
440G-MZS20*NR*
Power to Release
No aux
14 24
Gray - Lock Cmd
White - OSSD 1
Black - OSSD 2
889D-F5NC-X
Safety Gate
440G-MZ
UVW
L1 L2 L3
+24V DC, Class 2, PELV
3 4
8
RS T
IMPORTANT Start the GLT logic configuration from 0 to configure 14 and 24 for use with
pulse testing; the PowerFlex® 525 drive can operate with pulse tested inputs to
S1 and S2.