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Rockwell Automation Publication 440R-UM013F-EN-P - July 2021
Chapter 6 Pulse Testing Functions
Figure 29 - Pulse Test Sequence for DI, DIS, and SI Safety Relays
Pulse Testing for OSSD
Outputs
The DIS safety relay has OSSD transistor outputs. One main transistor
supplies current to four individual transistors (see
). When the main
transistor is pulse tested, the pulse appears on all outputs. When the individual
transistors are tested, the pulse only appears on that transistor.
Figure 30 - Output Transistor Arrangement
The pulse test pattern is shown in
50…150 μs. The pulse pattern on terminal 14 is identical to terminal 34, and the
pulse pattern on 24 is identical to 44. The pattern is repeated every
3.371 seconds.
Figure 31 - OSSD Output Test Pulses on DIS Safety Relay
Although pulse tests appear on terminals 34 and 44, the DIS safety relay does
not detect faults from A1 to 34, 44 or between 34 and 44 when the outputs are
ON.
When using a digital voltmeter, S11 measures approximately 14V DC and S21
measures approximately 18V DC when the supply voltage to A1 is 24V DC and the
input circuits are open.
0
24V
0V
S11
S21
24V
0V
4
6.4
5.5
8
17.7
20
19
0
3
6.4
9
13.6
16.8
20
22.5
21.5
Time (ms)
24
14
44
33
Main Transistor
Individual Transistors
24V
0V
24V
0V
0
131
524
655
3371 (ms)
262
393
Main Transistor Test
Terminals
14 and 34
24 and 44
Individual Transistor Tests
Repeats
Содержание 440R-D22R2
Страница 12: ...12 Rockwell Automation Publication 440R UM013F EN P July 2021 Chapter 1 Overview Notes...
Страница 16: ...16 Rockwell Automation Publication 440R UM013F EN P July 2021 Chapter 2 Installation Notes...
Страница 81: ...Rockwell Automation Publication 440R UM013F EN P July 2021 81 Appendix A Specifications Notes...
Страница 82: ...82 Rockwell Automation Publication 440R UM013F EN P July 2021 Appendix A Specifications...
Страница 89: ...Rockwell Automation Publication 440R UM013F EN P July 2021 89 Guardmaster Safety Relays User Manual...