S+S REGELTECHNIK PREMASGARD 714 Modbus Serie Bedienungs- Und Montageanleitung Seite 17

G
®
PREMASGARD
Schematic diagram
Plug for
display
B
4
A
3
GND
2
U+
1
shield
DIP A: Bus address
DIP B: Bus parameters
(Baud rate, parity...)
Telegram indicator
Reception (LED green)
Error (LED red)
Manual zero point calibration (Pa):
1. The device must be operative for at least 60 minutes before zero point
setting is started.
2. Connect pressure inputs P (+) and P (–) with a hose
(differential pressure between the connections = 0 Pa).
3. To set the zero point, press the "auto zero" pushbutton for 10 seconds
without interruption.
By pressing the pushbutton, a countdown of approx. 10 seconds is started.
The yellow LED is blinking and the countdown is shown on the display
(optional).
After the countdown period has elapsed, zero point calibration takes place.
This is indicated by continuous LED light and at the display (optional)
by switching from "AUTO 0" to "PROG 0".
Note: When releasing the pushbutton during countdown
(counter > 0), zero point setting is immediately aborted!
714x - Modbus
PREMASGARD
auto zero
mode B
ON DIP B ON
1 2 3 4 5 6 1 2 3 4 5 6 7 8
Pa
shield
LED (internal status)
Reset button
Offset correction
Shielding
® Pin assignment
714x - Modbus
(M12)
mode A
DIP A
offset
B
8
A
7
GND
6
U+
5
Automatic zero point calibration (Pa):
A zero point calibration is carried out cyclically via
an internal valve.
The cycle time can be set between 15 minutes and 24 hours
using the Register 4x0025.
During the automatic calibration, the output value remains
at its last pressure value.
Note:
This function is not available as standard on all device types
but can be ordered as an option (see type table).
Manual offset adjustment ( Pa ) :
The sensors are pre-set and calibrated at the factory.
For subsequent adjustment of the measured value,
there is an offset potentiometer (Pa).
The adjusting range is ± 5 % of the pressure measuring range.
17
PREMASGARD
MALE
2
3 5 1
4
1
+UB
2
Modbus A
3
–UB GND
4
Modbus B
5
Shield
Rev. 0000 - V10
®
714x - Modbus
FEMALE
2
1 5 3
4