3200 Series
26 Part No HA028651 Issue 7.0 Apr-09
5.5
Dwell Timer
A dwell timer (‘
TM.CFG’ = ‘
DwEl
’) is used to control a
process at a fixed temperature for a defined period.
In reset
the controller behaviour depends on the
configuration of the END state parameter. See
opposite.
In run
the heating or cooling will come on. Timing
starts when the temperature is within the threshold
‘
THRES’
of the setpoint. If the threshold is set to OFF
the timing starts immediately.
If setpoint ramping is enabled, then the ramp completes
before the timer starts.
In the END state
the behaviour is determined by the
parameter ‘
END.T’
(End type):
OFF
:
The heating and cooling is turned OFF (resets
to Off)
Dwell
: Controls at setpoint1 (resets to Setpoint 1)
SP2
Controls at setpoint 2 (resets to Setpoint 1)
Note: The dwell period can be reduced or increased
while the timer is running.
5.6
Delayed Timer
‘TM.CFG’ = ‘
DELY
’.
The timer is used to switch on the
output power after a set time. The timer starts
immediately on power-up, or when run.
The controller remains in standby with heating and
cooling off until the time has elapsed. After the time
has elapsed, the instrument controls at the target
setpoint.
TIMER END
OFF
End
State
e n d . t
=
OFF
SP2
dwel
SP2
Temp
SP1
Time
THRES = + n
RUN Digital O/P =
t.run
END Digital O/P =
t.End
RESET Digital Input
OFF TIMER
RUNNING
OFF
Scrolling message
Counting
down
Temperature
RUN Digital O/P =
t.run
Reset
Run
RESET Digital input
SP1 (70)
Time
TIMER RUNNING
TIMER END
Scrolling Message
END Digital O/P =
t.End
