dunphy TAD4, Operating Manual

Page: 56 / 165

Operating Instructions For TD/TAD4 Dual Fuel Burner
June 13 56 of 165 TD/TAD4 Manual Rev 4
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If any step of the gas proving sequence fails
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In stages 1-9 (inclusive) if a flame is detected

In stages 11-16 (inclusive) if a flame is not detected

In stage 4 if the air pressure switch goes high (air pressure present)

In stages 7-18 (inclusive) if the air pressure switch goes low (air pressure not present)

In stages 5, 7 and 8, stages 10-16 (inclusive) and stage 18 if a motor is not in the correct
position

In any stage, if an internal or external fault not previously mentioned occurs which may
affect the safe operation of the burner
5.7 Ratiotronic 6000 Inverter interface additional information
The Ratiotronic 6000 may have an optional daughter board within the main enclosure to allow
control of 1 or 2 inverter drives (daughter board dependent). Optionally the daughter board is also
available to allow feedback to be taken from directly from encoders measuring the speed of the
relevant motor, fan or pump shaft. There is also an option to allow the speed of an additional rotary
device to be monitored as an encoder input.
When not configured to control an inverter, the 4-20mA outputs may be configured to transmit
system variables as current outputs.
There are special wiring requirements for inverter feedback.
5.8 Post Purge Operation
If a post combustion purge is selected (with option parameter 7.9), a normal shutdown post purge
will be performed at low fire. The drives will move to the low fire position (if not already there)
and the post-purge time will then start. If the burner has turned off because the fuel profile selection
has been removed (i.e. set to NONE), no post-purge will be performed.
If the burner locks out at or after ignition, and a post-purge time has been entered, the controller
will also attempt a post purge. For a flame failure fault, the controller will attempt to post purge at
high fire. For all other faults, the drives will stay at the positions they were in when the lockout
occurred. In both cases, the post-purge time starts at the moment the lockout occurs – the controller
does not wait for drives to position before starting the post-purge time.