Proline Promass 83E/F/O Description of Device Functions - FMC ...

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7 Block OUTPUTS Device Functions Proline Promass 83 7.3.4 Information on the response of the relay output General If you have configured the relay output signal for “LIMIT VALUE” or “FLOW DIRECTION”, you can define the requisite switch points in the ON VALUE and OFF-VALUE functions. When the measured variable in question reaches one of these predefined values, the relay output switches as shown in the illustrations below. Relay output configured for “flow direction” The value you entered in the function ON-VALUE defines the switch point for the positive and negative directions of flow. If, for example, the switch point you define is = 1 m 3 /h, the relay drops out at –1 m 3 /h and pulls up at +1 m 3 /h. Set the switch point to 0 if your process calls for direct switchover (no switching hysteresis). If low flow cut off is used, it is advisable to set hysteresis to a value higher than or equal to the low flow cut off rate. Switch-on/switch-off point -Q Q -1 0 +1 a b a = Relay energized b = Relay de-energized A0001236 Relay output configured for limit value The relay output signal switches as soon as the measured variable undershoots or overshoots a defined switch point. Application: Monitoring flow or process-related boundary conditions. Measured variable m A B C n n m m n o o o t A0001235 m = SWITCH-OFF POINT, n = SWITCH-ON POINT, o = Relay de-energized A = Maximum safety (SWITCH-OFF POINT > SWITCH-ON POINT) B = Minimum safety (SWITCH-OFF POINT < SWITCH-ON POINT) C = Minimum safety (SWITCH-OFF POINT = SWITCH-ON POINT, this configuration is to be avoided) Page 108 • MN0M023 Issue/Rev. 0.2 (12/12)
Device Functions Proline Promass 83 7 Block OUTPUTS 7.3.5 Switching behavior of the relay output Function State Relay coil NC Contact* NO ON (operation) System in measuring mode XXX.XXX.XX - Esc + E energized A0001052 A0001239 A0001237 System not in measuring mode (power supply failed) XXX.XXX.XX Esc - + E de-energized A0001291 A0001240 A0001238 Fault message System OK XXX.XXX.XX - Esc + E energized A0001052 A0001239 A0001237 (System or process error) Fault Failsafe mode, outputs /Inputs and totalizers XXX.XXX.XX Esc - + E de-energized A0001291 A0001240 A0001238 Notice message System OK XXX.XXX.XX - Esc + E energized A0001052 A0001239 A0001237 (System or process error) Fault Continuation of measuring XXX.XXX.XX Esc - + E de-energized A0001291 A0001240 A0001238 Fault message or Notice message System OK XXX.XXX.XX Esc - + E energized A0001052 A0001239 A0001237 (System or process error) Fault Failsafe mode or Note Continuation of measuring XXX.XXX.XX Esc - + E de-energized A0001291 A0001240 A0001238 Issue/Rev. 0.2 (12/12) MN0M023 • Page 109
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