IM-P402-62 AB Issue 5
8
To commission the transmitter proceed as follows:-
1. Ensure the transmitter is set up for the correct functions and mains supply voltage.
2. Alter the water level in the tank or boiler to
the required low level, or zero point. This is
the
point at which you require the 4 mA, (or 0 mA) to be transmitted.
3. Adjust the zero adjust potentiometer (bottom) until the > 0% LED just lights.
4. Alter the water level to the required high level. This is the level at which the 20 mA signal is
to be transmitted. (Note: that these output signals will be reversed if 'reverse action'
as been selected on switch 3).
5. Adjust the span adjust potentiometer (top) until the > 100% LED just lights.
6. As an aid to commissioning, an ammeter may be connected across the test output pins (5
and 6), to indicate transmitted current.
6. Commissioning
7. Maintenance
8. Fault finding
No special servicing or maintenance of the transmitter is necessary. Boiler water level controls
and level alarms, however, do require testing and inspection. General guidance is given in Health
and Safety Executive Guidance Note PM5.
For specific instructions for the Spirax Sarco system please see separate literature.
Available spares
Spare fuses
Stock No. 4033380
Set of 3
Most faults which occur on commissioning are due to incorrect wiring or setting up.
In the case of problems the following checklist may be helpful:-
Mains on LED not lit:
-
No live supply
-
Neutral not connected
-
Transmitter internal fuse blown.
Transmitter internal fuse blown:
-
Check the mains supply voltage is lower than 264 V, and that the ambient temperature inside
the control panel is less than 55°C (131°F). If either of these limits has been exceeded, it
is possible that the transformer internal thermal fuse has blown, and that the transformer
will need to be replaced.
-
Ensure that the probe supply voltage is between 24 Vdc and 35 Vdc between terminals 10 and
12 of the transmitter, or terminals 1 and earth of the probe.
-
The probe output voltage should be 1 Vdc to 6 Vdc between terminals 11 and 12 of the
transmitter, or terminals 2 and earth of the probe, depending on the level.
-
The voltage increases with the level, even when inverse output has been selected.