FMC Technologies Proline Promass 83 E - Function Description

Issue/Rev. 0.2 (12/12)
Page 66 • MN0M023
7 Block OUTPUTS Device Functions Proline Promass 83
VALUE 0_4 mA
(continued)
Parameter setting example A:
1. VALUE 0_4 mA (4002) = not equal to zero flow (e.g. –5 kg/h)
VALUE 20 mA (4003) = not equal to zero flow (e.g. 10 kg/h) or
2. VALUE 0_4 mA (4002) = not equal to zero flow (e.g. 100 kg/h)
VALUE 20 mA (4003) = not equal to zero flow (e.g. –40 kg/h)
and
MEASURING MODE (4004) = STANDARD
When you enter the values for 0/4 mA and 20 mA, the working range of the measuring
device is defined. If the effective flow drops below or exceeds this working range
(see Fig. m), a fault/notice message is generated (#351-354, current range) and the
current output responds in accordance with the parameter settings in the function
FAILSAFE MODE (4006).
A0001262
Parameter setting example B:
1. VALUE 0_4 mA (4002) = equal to zero flow (e.g. 0 kg/h)
VALUE 20 mA (4003) = not equal to zero flow (e.g. 10 kg/h) or
2. VALUE 0_4 mA (4002) = not equal to zero flow (e.g. 100 kg/h)
VALUE 20 mA (4003) = equal to zero flow (e.g. 0 kg/h)
and
MEASURING MODE (4004) = STANDARD
When you enter the values for 0/4 mA and 20 mA, the working range of the measuring
device is defined. In doing so, one of the two values is configured as zero flow
(e.g. 0 kg/h).
If the effective flow drops below or exceeds the value configured as the zero flow, no
fault/notice message is generated and the current output retains its value.
If the effective flow drops below or exceeds the other value, a fault/notice message is
generated (#351-354, current range) and the current output responds in accordance with
the parameter settings in the function FAILSAFE MODE (4006).
A0001264
Deliberately only one flow direction is output with this setting and flow values in the
other flow direction are suppressed.
Parameter setting example C:
MEASURING MODE (4004) = SYMMETRY
The current output signal is independent of the direction of flow (absolute amount of the
measured variable). The 0_4 mA value m and the 20 mA value n must have the same
sign (+ or
-). The “20 mA VALUE” o (e.g. backflow) corresponds to the mirrored 20 mA
VALUE n (e.g. flow).
A0001249
ASSIGN RELAY (4700) = FLOW DIRECTION
With this setting e.g. the flow direction output via a switching contact can be made.
Parameter setting example D:
MEASURING MODE (4004) = PULSATING FLOWopage 68 ff.
Function description
OUTPUTS o CURRENT OUTPUT (1...3) o CONFIGURATION
-5 0 0
-40
44
20
20
10 100
mA
mA
Q
➀➀ ➀➀
1) 2)
Q
00
4
4
20
20
10 100
mA
mA
Q
Q
➀➀
1) 2)
Q
20
0
mA
4
➂➀➁