Danfoss DGS Series User Manual

DGS with Modbus network communication in combination with other devices powered by more
than one power supply
It is strongly recommended to use direct current power supply when:
• more than 5 DGS units are powered by the same power supply
• the bus cable length is longer than 50 m for those powered units
It is moreover recommended to use class 2 power supply (see AK-PS 075)
Make sure to not interrupt the shield when connecting A and B to the DGS (see Fig. 4).
Ground potential difference between nodes of the RS485 network might affect the communication.
It is advised to connect a 1 KΩ 5% ¼ W resistor between the shield and the ground (X4.2) of any unit
or group of units connected to the same power supply (Fig. 6).
Please refer to Literature No. AP363940176099.
Power supply and voltage alarm
The DGS device goes into voltage alarm when voltage exceeds certain limits.
The lower limit is 16 V.
The upper limit is 28 V, if DGS software version is lower than 1.2 or 33.3 V in all other cases.
When in the DGS the voltage alarm is active, in the System Manager the “Alarm inhibited” is raised.
Fig. 6: Wiring diagram for system with multiple power supplies
Danfoss 80Z878
Shield
Shield
DGS 1
#adr n1
+
A
B Gnd
DGS 2
#adr n2
+
A
B Gnd
DGS n
#adr nx
+
A
B Gnd
+
–
+
–
DGS 1
#adr n11
+
A
B Gnd
DGS 2
#adr n12
+
A
B Gnd
DGS n
#adr ny
+
A
B Gnd
A
B
Shld
Busmaster
L
N
L
N
230 V
Danfoss
Modbus
device
AK-SM
A
B
Shld
Busslave
230 V
Danfoss
Modbus
device
AK-CC
1 KΩ
1 KΩ
AK-PS 075 power supply
AK-PS 075 power supply
L
N
230 V
L
N
230 V
User Guide | Danfoss Gas sensor, type DGS
8 | BC291049702513en-000201 © Danfoss | Climate Solutions | 2022.01

Danfoss DGS Series Specifications

General

Brand	Danfoss
Model	DGS Series
Category	Accessories
Language	English