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 (FREQUENCY) MEASURING MODE (continued) • PULSATING FLOW If flow is characterized by severe fluctuations as is the case, for example, with reciprocating pumps, flow components outside the measuring range are buffered, balanced and output after a maximum delay of 60 seconds. If the buffered data cannot be processed within approx. 60 seconds, a fault/notice message appears. Under certain plant conditions, flow values can aggregate in the buffer, for example in the case of prolonged and unwanted fluid backflow. However, this buffer is reset in all relevant programming adjustments which affect the frequency output. Page 80 • MN0M023 Issue/Rev. 0.2 (12/12)
Device Functions Proline Promass 83 7 Block OUTPUTS Function description OUTPUTS PULSE/FREQUENCY OUTPUT (1...2) CONFIGURATION (FREQUENCY) OUTPUT SIGNAL (4207) ! Note! Function is not available unless the FREQUENCY setting was selected in the OPERATION MODE (4200) function. For selecting the output configuration of the frequency output. Options: 0 = PASSIVE - POSITIVE 1 = PASSIVE - NEGATIVE 2 = ACTIVE - POSITIVE 3 = ACTIVE - NEGATIVE Factory setting: PASSIVE - POSITIVE Explanation • PASSIVE = power is supplied to the frequency output by means of an external power supply. • ACTIVE = power is supplied to the frequency output by means of the device-internal power supply. Configuring the output signal level (POSITIVE or NEGATIVE) determines the quiescent behavior (at zero flow) of the frequency output. The internal transistor is activated as follows: • If POSITIVE is selected, the internal transistor is activated with a positive signal level. • If NEGATIVE is selected, the internal transistor is activated with a negative signal level (0 V). ! Note! With the passive output configuration, the output signal levels of the frequency output depend on the external circuit (see examples). Example for passive output circuit (PASSIVE) If PASSIVE is selected, the frequency output is configured as an open collector. m 1 5 7 8 3 + = - U max n =30VDC m = Open collector n = External power supply A0001225 ! Note! For continuous currents up to 25 mA (I max = 250 mA / 20 ms). Example for output configuration PASSIVE-POSITIVE: Output configuration with an external pull-up resistance. In the quiescent state (at zero flow), the output signal level at the terminals is 0 V. + U =30VDC max U (V) m n U (V) o t p t m = Open collector n = Pull-Up-Resistance o = Transistor activation in “POSITIVE” quiescent state (at zero flow) p = Output signal level in quiescent state (at zero flow) A0004687 (continued on next page) Issue/Rev. 0.2 (12/12) MN0M023 • Page 81
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