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

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7 Block OUTPUTS Device Functions Proline Promass 83 Function description OUTPUTS PULSE/FREQUENCY OUTPUT (1...2) CONFIGURATION (PULSE) OUTPUT SIGNAL (continued) Example for active output circuit (ACTIVE): With an active circuit, the internal power supply is 24 V. The pulse output is short-circuit proof. = - ➀ + ➁ 1 5 7 8 3 m = 24 V DC internal power supply n = Short-circuit proof output A0004691 The signal levels are to be seen as analogous to the passive circuit. The following applies for the output configuration ACTIVE-POSITIVE: In the quiescent state (at zero flow), the output signal level at the terminals is 0 V. U 24 V 0V t A0004694 In the operating status (flow present), the output signal level changes from 0 V to a positive voltage level. 24 V U 0V t A0004692 The following applies for the output configuration ACTIVE-NEGATIVE: In the quiescent state (at zero flow), the output signal level at the terminals is at a positive voltage level. 24 V U 0V t A0004693 In the operating status (flow present), the output signal level changes from a positive voltage level to 0 V. 24 V U 0V t A0004710 Page 90 • MN0M023 Issue/Rev. 0.2 (12/12)
Device Functions Proline Promass 83 7 Block OUTPUTS Function description OUTPUTS PULSE/FREQUENCY OUTPUT (1...2) CONFIGURATION (PULSE) FAILSAFE MODE (4227) ! Note! This function is not available unless the PULSE setting was selected in the OPERATION MODE function (4200). For safety reasons it is advisable to ensure that the pulse output assumes a predefined state in the event of a fault. The setting you select here affects only the pulse output. It has no effect on other outputs and the display (e.g. totalizers). Options: FALLBACK VALUE Output is 0 pulse. ACTUAL VALUE Measured value output is based on the current flow measurement. The fault is ignored. Factory setting: FALLBACK VALUE Issue/Rev. 0.2 (12/12) MN0M023 • Page 91
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