ABB module PPC380AE102 HIEE300885R0102 supplies DCS system
Technical data of product parameters
The frequency of the flow meter output, fT, is calculated by dividing the total number of pulses output (NT) by the time PPC380AE102 HIEE300885R0102
between two rising edges of the flow meter output (tTmeas) that occur immediately after the encoder rising edges that mark
the start and stop of the piston travel time. Note that the encoder time is measured independently from the flow meter
time and while they are very nearly coincident, they are not necessarily equal in duration. As for the previous cases, the PPC380AE102 HIEE300885R0102
flow meter pulse totalization time has quantization uncertainty of
t 6 .
The LFSs have redundancy in the encoders and oscillators in order to avoid miscounting pulses and to allow internal
validation of measurements. Each LFS system uses two encoders (1 and 2), each providing two pulse outputs (A and B).
Output A originates from the leading edges of the encoder pulses and output B indicates the trailing edges. Therefore, a
total of four chronometries (1A, 1B, 2A, and 2B) are used to measure the piston travel and thereby improve the accuracy
of the measured collection time. Additionally, the LFSs use two oscillators each to measure the piston travel interval. The PPC380AE102 HIEE300885R0102
first oscillator is used to measure time for chronometries 1A and 2A and the second oscillator operates on 1B and 2B. The
Type B uncertainties of the clocks are assumed to be fully correlated between clocks operated by the same oscillator.
Increasing the number of chronometries or measurements does not improve the measurement uncertainty when the
uncertainties are fully correlated.
The fact that the intervals over which the encoder and flow MUT frequencies are measured are not perfectly coincident is
a negligible uncertainty contributor because the time difference is < 0.001 % and the flow is steady within Referring to the graphic representation of the uncertainty analysis, given in Figure 5 and the uncertainty propagation
Equation (13) given above, the uncertainty of the sub-measurements must be assessed before the flow uncertainty can be PPC380AE102 HIEE300885R0102
Product picture display
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Introduction to main products
Focus on DCS, PLC, robot control system and large servo system.
Main products: various modules/cards, controllers, touch screens, servo drives.
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This article from the temporal Ming sheng automation equipment co., LTD.,
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