8
A: Main power connections
The LS1, LS2 and NS terminals are
electrically isolated. If the LS connections
are used, a connection must be made
with the NS terminal. This can be via a
jumper or dedicated neutral connection.
This appliance incorporates an earth connection for functional purposes only.
B: Low voltage connections
For best performance use 4-core,
low voltage, twisted pair, telecoms type
cable for accessories
(available from Vent-Axia part number 459931).
Position
Label
Description
Action
A
RS485
5V
5V Output, Max 250mA
RS485 communication to wired
accessories.
Data connection is only available for SMV/SMV Plus units.
The 5V and Ground connections are available on all units.
B
A+
Data
C
B-
Data
D
GND
Ground
E
D IN 2
COM
Digital input common
Go to Boost speed
(Min.1V, max. 6V)
.
The 5V output from the
RS485 connection can be used as
a power supply
F
+
Digital input 2
G
D IN 1
COM
Digital input common
Go to Low speed
(Min.1V, max. 6V)
.
The 5V output from the
RS485 connection can be used as
a power supply
H
+
Digital input 1
I
D OUT
2
COM
Digital output common
Unpowered Boost indicator Switch
(switching 6V 50mA max)
J
+
Digital output 2
K
D OUT
1
COM
Digital output common
Unpowered LED fault indicator switch
(switching 6V 50mA max)
L
+
Digital output 1
M
AN 2
+
Analog input 2
0-10V analogue input.
Two user settable voltage thresholds with two user settable
actions. The unit will run at Normal when supplied voltage is
between the two thresholds.
N
GND
Ground
O
AN 1
+
Analog input 1
P
GND
Ground
Connection
Description
1 L
Live (220-240Vac)
2 N
Neutral
3
Functional Earth
4 LS1
Live Switched 1, (220-240Vac), isolated
5 LS2
Live Switched 2 (220-240Vac), isolated
6 NS
Neutral Switched, isolated
A
P
D
E
L
M
1
2
3
5
4
6
