KRAL BEM 500 - Page 34

11 Menu description
11.5 Menu 3: Output settings
Menu item Description
3.13Setting Function
relay1
Off
Relay1 is deactivated.
Bypass1
Differential measurement with two flowmeters. If one of the counters with the rate values drop below
the Limit value bypass and the second follows within the Bypass delay, the relay goes to the basic
setting and the alarm Bypass valve activated is generated. Alarm, Relay1 and Relay2 can be reset
again in 1.10Display reset bypass and group error message .
Bypass2
Single-line measurement with flowmeterA. If it falls below Limit value bypass The relay goes into the
basic setting. After every expiry of the repeat attempt period, the relay is switched until the bypass
time Bypass delay is expired. After that it drops again and the repeat attempt period starts again. If it
is exceeded within the repeat attempt period Limit value bypass , the relay remains switched.
Bypass3
Differential measurement with two flowmeters analog Bypass2. However, both flowmeters must be
operated with the Limit value bypass .
Filling
Filling function, see 1.07Filling amount,
Bypass 4
Differential measurement with two flowmeters. If it falls below Limit value bypass trough one of the
flowmeters, the relay goes into the basic setting. No alarm message is generated because the NO
contact of Relay1 must always be switched in series with a motor on contact to ensure a correct by-
pass release.
Note:
In the case of the functions Bypass2 and Bypass3 the valves should be switched via additional semi-
conductor relays in view of the switching frequency.
3.14Setting Limit value
bypass
The function allows the automatic activation of a bypass valve when a flowmeter blocks. The limit
value is selected smaller than the smallest minimum flow rate occurring during normal operation.
0
All bypass function are deactivated.
3.15Setting Delay
bypass
The time delay is the sensitivity of the bypass function. The condition for triggering the bypass relay
must exist continuously during the set time.
Note:
The manufacturer recommends high sensitivity under high safety requirements.
3.16Setting Waiting
period repeat bypass
The repeat attempt period is important at the relay function Bypass_2 or Bypass3, see 3.13Setting
Function relay1If the limit value is not exceeded, the flowmeter remains in bypass operation. After
expiry of the Waiting period repeat bypass relay is switched and the valve is closed. If the limit value
is not exceeded within theBypass delay the relay is switched back to the initial position. The Waiting
period repeat bypass starts running again.
3.17Setting Switch
Relay1
Manual switching of the relay can be necessary in emergencies or during commissioning of the sys-
tem.
On
Manual switching is activated.
Off
Manual switching is deactivated.
3.18Setting Switch
Relay2
Manual switching of the relay can be necessary in emergencies or during commissioning of the sys-
tem.
On
Manual switching is activated.
Off
Manual switching is deactivated.
3.19Setting Modbus
address
The transfer of data by means of the Modbus is possible via the serial interface. The address can be
set here.
Note:
Data exchange via the Modbus connection is not password-protected! Write access deletes existing
values. Therefore the manufacturer only recommends reading of the data.
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OIE 12en-GB Edition 2020-03
Operating instructions