KRAL BEM 500 - Page 32

11 Menu description
11.5 Menu 3: Output settings
Menu item Description
3.04Setting Allocation
analog output2
o Q
Rate consumption A-B or A+B
o QA
Rate current flow flowmeterA
o QB
Rate current flow flowmeterB
o T1
Total consumption A-B or A+B
o TA1
Total flow flowmeterA
o TB1
Total flow flowmeterB
3.05Setting Scale
analog max. output2
The scale of the analog output is used to set the maximum value. The maximum value is set slightly
higher than the highest possible occurring flow rate. If the value0 is entered here, Analog output 1 is
deactivated and 0V or 4mA respectively is output.
3.06Setting averaging
analog average
In the case of fluctuating flow rates the use of averaging allows a stable display. Averaging can be ad-
apted to the requirements with values between 1 and 10000. However, rapid changes are only dis-
played with a time delay.
Examples of reaction time for a change of 99.9% of the actual frequency jump:
o Averaging0 or 1: 0.02 s
o Averaging2: 0.04 s
o Averaging8: 0.16 s
o Averaging9: 1.3 s
o Averaging500: 75 s
o Averaging1000: 150 s
o Averaging10000: 1500 s
No filter is active for Averaging0 or1. In the case of Averaging2–8 a continuous average-value gen-
eration is carried out. A V
Z
1 filter is active at Averaging9–10000. In the process the old measured
value is weighted higher by the averaging value than the new measured value. Averaging of the dis-
play is also active on the Modbus.
3.07Setting Function
pulse output
Independent
The two pulse outputs can be used independently of each other.
Encoder
Both pulse outputs deliver two 90° square wave signals out of phase. This passes on the information
about the flow direction. The allocation of the second pulse output and its scale remain ineffective.
Note:
After the setting has been changed, the electronic unit has to be restarted.
The BEM500 can be used as a pulse selector under the following requirements:
o Function pulse inputs = Encoder
o Function pulse outputs = Independent
o Occurrence of changes in the direction of rotation
If reverse pulses occur at the pulse inputs, no pulses are output at the assigned pulse outputs. Instead
up to 10 reverse pulses are stored in a reverse counter. As soon as forwards pulses are generated
again, these are deducted from the counter level of the reverse counter until it shows 0 again 0 . Only
then are pulses output again at the pulse output in accordance with the scale.
3.08Setting Allocation
pulse output1
A total value can be assigned freely to the Pulse output1.
T
Total consumption A-B or A+B
TA
Total flow flowmeterA
TB
Total flow flowmeterB
Note:
After the setting has been changed, the electronic unit has to be restarted.
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OIE 12en-GB Edition 2020-03
Operating instructions