Preferred JC-22D2 User Manual

SDI-JC-22D2 rev. 11-1-21 page 13 of 22
Parameters
Screen Settings
Parameter
Default
Max.
Min.
Go
to: Menu > Utilities > Screen Settings
1 Disable Enable Disable
Touch Buzzer Enable
Activates faceplate Tone when a
screen item is touched
2
Disable
Enable
Disable
Alarm Buzzer Enable
Activates faceplate Tone when a
n Alarm is triggered.
Draft Control Setpoint
Parameter
Default
Max.
Min.
Go to: Menu > Draft Control Setpoint
40 -0.10 +200.00 -200.00
Draft
Control Setpoint
See: Draft Xmtr Setup for the Units
Tuning
Parameter Default Max. Min. Go to: Menu > Tuning
41 0.25 25.00 0.025
Draft Proportional Band
Expressed in the same units/scaling of the Draft Xmtr (see Draft Xmtr Setup menu)
Smaller values cause more aggressive control action.
Larger
values cause less aggressive
control
action.
42 0.030 1.500 0.003
Draft Deadband
Expressed in the same units/scaling of the Draft Xmtr (see Draft Xmtr Setup menu)
If the draft pressure is with +/- Draft Deadband of the setpoint, the damper stops.
Smaller Deadband increases damper movement and allows for tighter control.
Setting the deadband too low can cause draft damper oscillation/hunting
Larger
values decrease damper movement but limit control pre
cision.
43 2.0 5.0 0.5
Xmtr Smoothing Filter (seconds)
Smooths out normal combustion pressure pulsations.
Smaller values reduce smoothing (Too small can cause damper hunting).
Larger
values ca
us
e more smoothing. (Too large can ca
us
e overshoot
oscillations
).
44 125 1000 75
Feedforward Prop. Band
Determines how the Damper/VSD responds to a change in the Burner Firing Rate.
Smaller proportional band will cause more aggressive Feedforward action.
L
arger
proportional band will cause less aggressive
Feedforward
action.
45 0.50 4.00 0.12
PID Minutes/Repeat
Proportional Band responds instantly to a Draft disturbance. After that, PID “Repeats”
ramps the damper back to the Draft Setpoint.
Smaller minutes/repeat will cause faster ramping (Too small causes oscillation).
Larger minutes/repeat will cause slower ramping.
46 30 75 25
Output Rate Limiter Sec./100%
Only affects Floating control mode. Prevents the damper from moving too fast.
Smaller Sec/100% allows damper to move faster.
Larger Sec/100% limits the damper speed.
This
value
should
always
be set to longer than the actuator
0
-
100%
stroke time.
47 100.0 100.0 0.0
Auto Max Output
When Released to Modulate AND in AUTO, this is the maximum damper opening.
This prevents “Reset Windup”. Otherwise, the Damper can stroke the full 0-100%.
Auto Max
Output
m
ust be
greater than
:
(Auto Min
Output
+ 25
)
48 0.0 100.0 0.0
Auto Min Output
When Released to Modulate AND in AUTO, this is the minimum damper opening.
This prevents “Reset Windup”. Otherwise, the Damper can stroke the full 0-100%.
Auto Min
Output
must be Less than
:
(Auto Max
Output
-
25)

Preferred JC-22D2 Specifications

General

Brand	Preferred
Model	JC-22D2
Category	Controller
Language	English