Models NOL/NOR Modulating Revision 101199B
Page 24
M
M
M
M
M
ODUL
ODUL
ODUL
ODUL
ODULAAAAATING
TING
TING
TING
TING
C
C
C
C
C
ONTROL
ONTROL
ONTROL
ONTROL
ONTROL
Landis & Staefa RWF32
The RWF32 controller has been specifically de-
signed for the control of boiler temperature or
steam pressure in Oil and Gas fired plant.
The unit is normally mounted in the side face of
the burner panel and is protected by a clear plas-
tic cover which can be swung downwards.
By using the appropriate
Setting Range Insert
, the
controller is configured for a controlling value and
required setting range. This setting range insert
forms part of the measuring bridge on the detector
side and also carries the setting scale. The setting
unit itself is an integral part of the controller.
Control Program Under Fault Conditions
And Lockout Indication
In the event of fault conditions the sequence
switch stops and simultaneously the lockout indi-
cator. The symbol appearing above the reading
mark indicates the kind of fault ebcountered.
No start,
because, e.g., the CLOSE signal has
not been supplied to control box terminal 8
by the servo motor limit or auxillary switch,
or a contact has not been closed between
control box terminals 12 and 4 or 4 and 5.
Shut down of start up sequence,
because
the OPEN signal has not been supplied to
control box terminal 8 by the servo motor
limit switch. Terminals 6,7 and 15 remain
under voltage until the fault is corrected.
Lockout
due to a fault in the flame supervi-
sion circuit.
Shut down of start up sequence,
because
the signal for the low flame position has not
been supplied to control box terminal 8 by
the servo motor auxillary switch. Terminals
6,7 and 15 remain under voltage until the
fault is corrected.
Lockout,
because no flame signal has been
received on completion of the safety time.
Lockout,
because the flame signal has been
lost during burner operation or an air pres-
sure failure has occured.
Lockout on completion or after completion
of the control program sequence
due to ex-
traneous light (e.g. flame not extinguished,
leaking fuel valves) or due to a faulty flame
signal (e.g. fault in the flame supervision cir-
cuit or similar).
a - b
Start up sequence.
b - b
idle steps up to the self shut down of
the sequence switch.
b(b) - a
Post purge sequence.
When lockout occurs, the control can be reset
immediately. After the resetting (and also after the
correctionof a fault which resulted in a controlled
shut-down, or after each mains failure) the se-
quence switch always runs through to the start
position, whereby
only
terminals 7,9,10 and 11
receive voltage in accordance with the control pro-
gram. It is only then that the control unit programs
a fresh burner start up.
Note:
Do not press the lockout reset button (or
remote reset switch) for more than 10 seconds.
1
a
b
b
1
Landis & Staefa
LAL1. Program
Sequence Disk.
I
