Page 5 of 7
MW-MD
Date of Issue: 08/03/2013
Issue Number: 5.3
Tel:
+44 (0) 1732 861200 -
E-mail:
Web:
www.sontay.com
© 2012 Sontay Limited. All rights reserved
Outputs:
Pulsed:
The pulse value of the outputs is permanently set and corresponds with the last position of the associated display value.
Example:
Output 1 = energy output
Energy display = XXXXX.XX MWh
Last position = 0.01 MWh = 10 kWh
Output pulse = 10 KWh
M-Bus:
The M-Bus interface complies with the norm EN 1434-3 and operates with 2400 baud fixed. It can be set to 300/6900 baud if
necessary.
Connections
Inputs:
Temperature sensors
Supply (hottest pipe)
1 & 2
Return (coolest pipe)
3 & 4
Flow sensor pulse
10 & 11 (GND)
If water meters with a potential free reed contact are connected to
the inputs the connection can be made in any direction.
Outputs:
Energy output pulse
52 & 53 (GND)
Volume output pulse
54 & 55 (GND)
Care must be taken when connection is made to a BMS.
M-Bus (M-Bus connections are given twice for incoming and outgoing of the M-Bus wires).
L1
24
L2
25
The symbols in the table below show the meter’s operational status. The status messages only appear in the main display (energy)! The
temporary display of the warning triangle can be caused by special operating states and does not always mean that the device is
malfunctioning. However, should the symbol be displayed over a longer period of time you should contact Sontay.
Symbol
Status
Event
Flow
existent
-
Attention Check
for
errors
Data
transmission
-
Emergency operation
Exchange device
External power supply
-
t
p
t
p
3 ...30V
0V
400m/s < t
p
< 300m/s
Error Codes:
Error codes show faults detected by MW-MD. If more than one error
appears, the sum of the error codes is displayed: Error 1005 = error 1000
and error 5.
Code Error Event
1
Short-circuit return sensor
Check sensors
2
Interruption return sensor
“
3
Short circuit supply sensor
“
4
Interruption supply sensor
“
5
Hardware
error
Exchange
device
6 Battery
empty/wrong
temp sensor
Check
7
Temp. out of measuring range
Correction of heating system
100
Emergency operation
Exchange device
1000
Battery life time exceeded
“
2000 Initial verification expired
“
>8000 Internal hardware error
“
