3 22 Manual Control
3 22 Manual Control
The manual control may be used for the following
:
purposes
The manual control may be used for the following
:
purposes
( 1 ) To test the process characteristics to obtain a step response as well as an
impulse response and use this data for tuning a controller.
( 1 ) To test the process characteristics to obtain a step response as well as an
impulse response and use this data for tuning a controller.
( 2 )
NOTE
To use manual control instead of a closed loop control as the sensor fails or
the controller's A-D converter fails.
that a bumpless transfer can not
be used for a long time. See section 3-17.
( 2 )
NOTE
To use manual control instead of a closed loop control as the sensor fails or
the controller's A-D converter fails.
that a bumpless transfer can not
be used for a long time. See section 3-17.
( 3 ) In certain applications, There may be a demand to supply a process with
a constant demand.
( 3 ) In certain applications, There may be a demand to supply a process with
a constant demand.
Operation:
Press
until
( Hand Control ) appears on the display.
Press
for 3 seconds then the upper display will begin to flash and the lower
display will show
. The controller now enters the manual control mode.
Pressing
the lower display will show
and
alternately where
indicates output 1 ( or heating ) control variable value MV1 and
indicates output 2 ( or cooling ) control variable value MV2. Now you can use
up-down key to adjust the percentage values for H or C.
The controller performs open loop control as long as it stays in manual control
mode. The H value is exported to output 1 ( OUT1 ) and C value is exported to
output 2 provided that OUT2 is performing cooling function ( ie. OUT2 selects
COOL ).
Press
until
( Hand Control ) appears on the display.
Press
for 3 seconds then the upper display will begin to flash and the lower
display will show
. The controller now enters the manual control mode.
Pressing
the lower display will show
and
alternately where
indicates output 1 ( or heating ) control variable value MV1 and
indicates output 2 ( or cooling ) control variable value MV2. Now you can use
up-down key to adjust the percentage values for H or C.
The controller performs open loop control as long as it stays in manual control
mode. The H value is exported to output 1 ( OUT1 ) and C value is exported to
output 2 provided that OUT2 is performing cooling function ( ie. OUT2 selects
COOL ).
Exception
If OUT1 is configured as ON-OFF control ( ie. PB1=0 if PB1 is assigned or
PB2=0 if PB2 is assigned by event input ), the controller will never perform
manual control mode.
If OUT1 is configured as ON-OFF control ( ie. PB1=0 if PB1 is assigned or
PB2=0 if PB2 is assigned by event input ), the controller will never perform
manual control mode.
Exit Manual Control
Exit Manual Control
To press
keys the controller will revert to its previous operating mode
( may be a failure mode or normal control mode ).
To press
keys the controller will revert to its previous operating mode
( may be a failure mode or normal control mode ).
Means
MV1=38.4 %
for OUT1 ( or Heating )
MV1=38.4 %
for OUT1 ( or Heating )
Means
MV2=7.63 %
for OUT2 ( or Cooling )
MV2=7.63 %
for OUT2 ( or Cooling )
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