WEG CFW501 V1.8X Programming Manual page 180

HVAC Functions
P1065 – External PID Controller Operation Mode
Adjustable
Range:
Properties:
Access groups
via HMI:
Description:
This parameter defines how the External PID controller will work.
P1065
0 It defines the External PID controller will be work always in automatic mode.
1 It defines the External PID controller will be work always in manual mode.
It defines the digital input DIx programmed for Automatic / Manual will select the operation mode External PID
2 controller in automatic (0) or manual (1). It also defines the transition from automatic to manual or manual to automatic
will be done without bumpless.
It defines the bit 14 of serial control word (P0682) will select the operation mode of External PID controller in automatic
3 (0) or manual (1). It also defines the transition from automatic to manual or manual to automatic will be done without
bumpless.
It defines the digital input DIx programmed for Automatic / Manual will select the operation mode of External PID
4 controller in automatic (0) or manual (1). It also defines the transition from automatic to manual or manual to automatic
will be done with bumpless.
It defines the bit 14 of serial control word (P0682) will select the operation mode of External PID controller in automatic (0)
5
or manual (1). It also defines the transition from automatic to manual or manual to automatic will be done with bumpless.
NOTE!
Bumpless transfer is making the transition from Manual to Automatic Mode or Automatic to Manual
Mode without causing variation in the output of the External PID Controller.
When the transition occurs from Manual to Automatic Mode, the output value in Manual Mode is
used to start the Integral portion of the External PID Controller.
This ensures that the output will start at this value.When the transition occurs from Automatic to
Manual Mode, the output value in Automatic Mode is used as the setpoint in Manual Mode.
18
18-22 | CFW501
0 = Always Automatic
1 = Always Manual
2 = Automatic or Manual selection via DIx and transition without
bumpless
3 = Automatic or Manual selection via Network and transition
without bumpless
4 = Automatic or Manual selection via DIx and transition with
bumpless
5 = Automatic or Manual selection via Network and transition
with bumpless
HVAC
Table 18.9: Description of external PID controller operation mode
Description
Factory 0
Setting: