Rockwell Automation 440R-D22R2, User Manual

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Rockwell Automation Publication 440R-UM013F-EN-P - July 2021 71
Chapter 11 Troubleshooting
Figure 80 - Continuity Test of the Voltage Supply Common Connection
The OSSD test pulses of the DIS safety relay, as viewed by an oscilloscope, are
shown in
Figure 81 and Figure 82 . Most often, the main transistor triggers the
scope; this test pulse appears on all four terminals simultaneously. The main
transistor pulses are about 110 μs wide. Each channel is tested individually as
shown in
Figure 82 . The individual pulses are about 50 μs wide. These pulse
widths are provided for informational purposes; the pulses cannot be turned
OFF or adjusted.
Figure 81 - OSSD Main Transistor Test Pulses
Figure 82 - OSSD Channel Transistor Test Pulse
34 44 14 24
S2
4
S1
A1
A2
OUT
<1
Ohms
DMM
24V common
24V DC supply
PowerFlex 525
AC Drive
Motor
110 µs
50 µs
50 µs
Terminal 14, 34
Terminal 24, 44