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RL 243 MP Multi-Purpose Relay
Technical Instructions
Document Number 155-042P25
September 10, 2018
Siemens Industry, Inc.
Page 5
Signal Advancing Relay
Output pressure will exceed input pressure by a constant value (as adjusted with spring
S-1) except as limited by available air supply at S-port (Figure 5).
Figure 5. Signal Advancing Relay.
Minimum Pressure
Relay
Relay output will always provide a minimum pressure as adjusted with spring S-1.
Variations in input signal below this minimum will not affect output pressure. Output
pressure will equal input pressure for any value over the minimum setting. Air supply to
S-port can be from EP valve or equivalent to provide interlock with system operation
(Figure 6).
Figure 6. Minimum Pressure Relay.