KRAL BEM 500 Series, Руководство по эксплуатации, Страница: 43 / 64

Operating Instructions OIE 12en Edition 2019-02 43
Menu 3: Output settings
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Note: In the case of the functions Bypass 2 and
Bypass 3 the valves should be switched via
additional semiconductor relays in view of the
switching frequency
3.14 Limit value bypass
The function allows the automatic activation of a
bypass valve when a volumeter blocks. The limit
value is selected smaller than the smallest
minimum flow rate occurring during normal
operation. If G1 = 0 is set, all the bypass
functions have to be deactivated.
3.15 Delay bypass
The time set here indicates the sensitivity of the
bypass function. The condition for triggering the
bypass relay must exist continuously during the
set time.
Note: We recommend high sensitivity under high
safety requirements.
3.16 Waiting period repeat bypass
The waiting period of the bypass repeat attempt
can be set in this menu. The repeat attempt
period is of importance when the relay function
"Bypass 2" or "Bypass 3" has been selected, see
"3.13 Function relay 1", page 42. If the limit value
is not exceeded, the volumeter remains in bypass
operation.
Therefore the relay is switched and thus the
valve is closed after the "Waiting period repeat
bypass" has expired: If the limit value is not
exceeded within the "Delay bypass", the relay is
switched back to the initial position. The Waiting
period repeat bypass restarts.
3.17 Relay 1 switch
Manual switching of the relay can be necessary
in emergencies or during commissioning of the
plant.
1. Deactivate the password protection, see 2.01.
2. Press SET.
The cursor flashes.
3. Switch the relay with ARROW UP or ARROW
DOWN.
4. Confirm with SET.
The cursor disappears. Manual switching is
deactivated.
3.18 Relay 2 switch
Function analog to 3.17 "Relay 1 switch".
Bypass 3 Differential measurement with 2
volumeters.
Functions like Bypass 2, but both
volumeters have to be operated
above the limit value.
Batching Batch function, see "1.07 Batch
quantity", page 35.
Function Description
3.14 Setting
Limit value
Bypass
G1: 100.0 l/min
3.15 Setting
Delay
Bypass:
30.0 s
3.16 Setting
Waiting period
Repeat
Bypass: 30.0 s
Cursor Description
Flashes Relay 1 can be switched manually.
Not visible Manual switching is deactivated.
3.17 Setting
Relay 1
Switch:
On
3.18 Setting
Relay 2
Switch:
Off