Rockwell Automation 440R-D22R2, Руководство пользователя

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Rockwell Automation Publication 440R-UM013F-EN-P - July 2021 65
Chapter 11 Troubleshooting
SWS Connections L11 and L12
CI and SI safety relays only have SWS outputs (terminal L11); they do not have
SWS inputs.
DI and DIS safety relays have both SWS input and output signals. If you have a
DI or DIS safety relay and the SWS input signal is not used, then the Logic IN
indicator is always OFF. If no wire is connected to terminal L12, then make
sure that the LOGIC switch is set is to either 1, 2, 5, or 6 (switch positions with
OR logic).
EM or EMD expansion safety relays have both SWS input and output signals.
You must connect a wire to L12. Your application requirements determine
whether L11 is used.
Figure 71 shows an example of an SWS connection. Note the L11 terminal
(which is the SWS output) can be connected to multiple L12 terminals (SWS
input), but the L12 terminal cannot be connected to multiple L11 terminals.
Figure 71 - Example SWS Connections
Figure 72 shows the characteristics of SWS signal when it is active. It starts
with a 1 ms pulse, followed 700 μs later by a 500 μs pulse. This waveform is
repeated every 4 ms. When inactive, the SWS is 0V.
Figure 72 - SWS Waveform
When the signal is active, use a digital multimeter to measure the voltage. The
digital multimeter shows 8…9V.
If a fault occurs with either an SWS input or SWS output, then that circuit is
held high. If a digital multimeter reads a voltage measurement of
approximately 21V, the signal is high. The PWR/Fault status indicator flashes
red five times.
Figure 73 on page 66 shows an example timing of a momentary interruption of
the SWS input. If a momentary interruption of the SWS signals occurs, the
downstream unit ignores interruptions less than 5.7 ms. The downstream unit
automatically turns off and then back on when the interruption is greater than
5.7 ms.
The momentary interruption does not cause a 'recovery' type fault, where the
output turns off and stays off and requires a further cycling of the SWS signal.
For long wire runs of the SWS signal, a shielded cable can be necessary to help
prevent nuisance faults from electromagnetic and motor noise.
L12 L11
A1
A2
+24V DC +24V DC
L11
A1
A2 L12 L11
A1
A2 L12 L11
A1
A2
+24V DC
SWS SWS SWS
+24V DC
L12 L11
A1
A2
+24V DC
24V DC Com (must have common reference)
CI or SI DI EM DIS EMD
24V
0V
1 0 1.7 2.2 4 ms
Terminals
L11 and L12