Chino DB600 Series - 5-8-4 Feedback input; 5-8-5 PID deadband;output deadband; 5-8-6 Control action

INST.No.INE-868G [DB600] General Instruction Manual
- 98 -
5-8-4 Feedback input
This function can be used for the ON-OFF servo output type only. Set the feedback zero to the output
value [%] that causes the actuator (control motor, etc.) to be fully closed, and set the feedback span to the
output value that causes the actuator to be fully open. The feedback deadband is a relay output deadband
in switching between OPEN and CLOSE sides.
5-8-5 PID deadband/output deadband
For the case of PID control, disturbance of control by steady noise is reduced when the deviation
(difference between PV and SV) is small.
If a set deadband is too large, a residual deviation (offset) may occur more frequently.
For the case of two-position control, there are only two status outputs available: ON and OFF. Therefore,
setting a small value for the deadband causes the ON/OFF output to be repeated and shortens the relay
life.
Output deadband PID deadband
5-8-6 Control action
There are two types of control action: heating control (Reverse) and cooling control (Direct).
The heating control operation decreases the output value [%] when the measured value (PV) is smaller than
the setting value (SV) (large deviation).
The cooling control operation increases the output value [%] when the measured value (PV) is larger than the
setting value (SV) (small deviation).
Out
p
u
t
Dead band
Out
p
ut 100%
Heating
control
Cooling
co
n
t
r
o
l