S+S Regeltechnik PREMASGARD 724x - Modbus Notice D'instruction page 17

G
®
PREMASGARD
Schematic diagram
mode (B)
Plug for
ON DIP B
display
1 2 3 4 5 6
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
1. The device must be operative for at least 60 minutes before zero point
setting is started.
2. Connect the two pressure inputs each P (+) and P (–) with a hose
(differential pressure between the connections = 0).
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!
724x - Modbus
PREMASGARD
auto Pa1 Pa 2 °C
zero
offset
address (A)
ON DIP A
1 2 3 4 5 6 7 8
shield
LED (internal status)
Reset button
Offset correction
Shielding
® Pin assignment
724x - Modbus
(M12)
B
8
A
7
GND
6
U+
5
Manual offset adjustment
The sensors are pre-set and calibrated at the factory.
For subsequent adjustment of the measured value,
there is an offset potentiometer.
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. 2022 - V12
®
724x - Modbus
FEMALE
2
1 5 3
4