Allen-Bradley Guardmaster - EMD Safety Relay (Cat. No. 440 R-EM4 R2 D)

Rockwell Automation Publication 440R-UM013E-EN-P - March 2017 57
Application and Wiring Examples Chapter 9
EMD Safety Relay
(Cat.No.440R-EM4R2D)
The EMD safety relay in Figure 49 is configured for a 5 second off-delay. The
single wire safety signal from terminals L11 to L12 instructs the EMD safety
relay to turn on and off. When the E-stop is pressed, the CI safety relay turns
off immediately and the EMD safety relay turns off 5 seconds later. The CI
safety relay monitors contactors K1…K6 and the status of the EMD safety relay
by sourcing the reset signal from the X32 terminal on the EMD safety relay.
In this example, the jumper from B1 to B2 makes the EMD safety relay
retriggerable. If the E-stop is released and the reset is pressed within the
5 second delay time, the outputs of the EMD safety relay do not turn off
because the internal timer is retriggered.
Figure 49 - EMD - Off Delay
Figure 50 shows the EMD safety relay that is configured for a 2.1 second on-
delay. The single wire safety signal from terminals L11 to L12 instructs the
EMD safety relay to turn on and off. When the reset button is pressed, the DIS
safety relay outputs turn on immediately. After a 2.1 second delay, the EMD
safety relay outputs turn on.
The DIS safety relay monitors contactors K1…K4 and the status of the EMD
safety relay by sourcing the reset signal from the X32 terminal on the EMD
safety relay.
Figure 50 - EMD - On Delay
A1
L11
X32B1 B2
L12 18 38 4828
17 37 4727
A2
EMD
440R-EM4R2D
RANGE TIME
0
1
2
3
4
5
6
7
8
9
1
2
3
4
5
67
8
10
9
K1
24V DC
24V Com
K2
K6
K5
K3
K4
Reset
To PLC
K1
K2 K3 K4
K5 K6
S11
S12
S21
S22
S34A1 13
L11A2 14
23
24
33 41
34 42
CI
440R-S13R2
RESET
0
MM
AM
LOGIC
0
1
2
3
4
56
7
8
DIS
440R-D22S2
S32 A1
Y32
S21S11 S22S12 S34S42
L12 L11
34A2 44
14 24
K1
24V DC
24V Com
K2
K3
K4
Reset
To PLC
K1
K2
A1
L11
X32B1 B2
L12 18 38 4828
17 37 4727
A2
EMD
440R-EM4R2D
RANGE TIME
0
1
2
3
4
5
6
7
8
9
1
2
3
4
5
67
8
10
9
K3 K4