3200 Series
28 Part No HA028651 Issue 7.0 Apr-09
5.8.1
Programmer Servo Mode and Power Cycling
The way in which the program starts when ‘Run’ is selected or after the power is turned off and on again, is determined
by the SERVO MODE parameter, as follows:-
SERVO MODE
SP
The program will start from the current
setpoint
value.
On recovery from power failure, the program will reset. It will require to be run again manually.
The working setpoint will revert to SP1 or SP2 (depending on which was selected) and the whole
program is repeated.
PV
The program will start from the
measured temperature
.
On recovery from power failure, the program will reset. It will require to be run again manually,
but it will start at the value of the PV at the point when the programmer is run again.
SP.rb
On recovery from power failure, the program will automatically run at the
last
ramp rate from the
current setpoint value
, see the sketches below.
PV.rb
The program will start from the
measured temperature
.
On recovery from power failure, the program will automatically run at the
last
ramp rate from the
current measured temperature
, see the sketches below.
The behaviour of the programmer following a power failure is shown graphically below for SERVO = SP.rb and PV.rb:-
5.8.2
To Operate the Programmer
Operation of the programmer is the same as the timer.
Operation
Action
Indication
To Run a program
Press and quickly release
W
+
V
Beacon -- RUN = On
Scrolling display - TIMER RUNNING
To Hold a program
Press and quickly release
W
+
V
Beacon -- RUN = Flashing
Scrolling display - TIMER HOLD
To Reset a program
Press and hold
W
+
V
for more than 1 second
Beacon -- RUN = Off
If End Type = Off then OFF will be displayed at the end
of the program
Program ended
Beacon -- RUN = Off
SPX = On if End Type = SP2
Scrolling display - TIMER END
Repeat the above to Run the programmer again (Note: it is not essential to reset it after the End state is reached)
Programs can also be operated from the
‘T.STAT’
parameter found in the level 2 parameter list.
PV
Power
off
Power
on
The SP (and PV) returns at the
previously set ramp rate and the
complete Dwell period is
repeated
PV
SP
Power
off
The SP (and PV)
resumes at the
previously set ramp
rate
Power
on
RMP.1 RMP.2 RMP.2