EM aSENSE-VAV (Modbus) all housings installation Oct'08
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Electrical connections
The power supply has to be connected to G+ and G0. G0 is considered as system ground. The
same ground reference has to be used for the
aSENSE™ VAV
unit and for any connected
device! Unless different transformers are used, special precautions need to be taken.
PLEASE NOTE!
The signal ground is not galvanically separated from
the
aSENSE™ VAV
power supply!
NOTE!
The same ground reference has to be used for
the
aSENSE™ VAV
unit and for any
connected device!
If possible keep the sensor powered up after mounting.
Connect the analogue output before measuring.
Connection
Terminal
Function
Electrical Data
Remarks
G+
G0
Power (+)
Power ground (-)
24 VAC/DC+ (+-20%), 3W
24 VAC/DC-
2W without output load
See note 1!
OUT 1
OUT 2
M
Analogue Output 1 (+)
Analogue Output 2 (+)
Signal Ground (-)
0-10 VDC or 0-20 mA,
2-10 VDC or 4-20 mA,
Same as Output 1
Connected to G0 via PTC fuse
According to positions of
OUT1 jumper and start point
selection. See note 2!
According to positions of
OUT2 jumper and start point
selection. See note 2!
See note 1!
Relay
Relay
Normally open
Contact free relay
minimum load 1mA/5V
rated load 0,5A/125VAC;
1A/24VDC
Triggered by register OUT3
OUT4
Analogue Output 4 (+)
or Open Collector
0-10 VDC
Max 0,5A, 55VDC / 40VAC
(half-wave rectifier protection)
According to positions of
OUT4.
See note 2 & 3!
DI1
DI1
Digital Input 1
Closed contact current 1mA
Open contact voltage max 5V
Do not apply any voltage
on this input!
Table I. Electrical terminal connections for
aSENSE™ VAV
Note 1
:
The ground terminal is used as negative power supply DC input or AC phase ground G0
(halfwave rectifier). The signal ground M, protected by a PTC resistor, is the same as power ground
G0 (permitting a ”3-wire” configuration). A single transformer may be used for the entire system.
