Danfoss VLT FC 102 Programming Manual page 184

Parameter Descriptions
3 3
Damper
Damper
Damper
Illustration 3.54 Example, Multi-zone, Single Setpoint
Example 2 – Multi-zone, multi-setpoint
The previous example illustrates the use of multi-zone,
multi-setpoint control. If the zones require different
pressures for each VAV box, each setpoint may be specified
in
•
Parameter 20-21 Setpoint 1.
•
Parameter 20-22 Setpoint 2.
•
Parameter 20-23 Setpoint 3.
By selecting [5] Multi-setpoint minimum in
parameter 20-20 Feedback Function, the PID controller
increases the fan speed if any one of the feedbacks is
below its setpoint. If all feedbacks are above their
individual setpoints, the PID controller decreases the fan
speed.
20-21 Setpoint 1
Range:
0
ProcessCtrl - 999999.999
Unit ProcessCtrlUnit
*
]
182
Supply
air fan
Cooling/
heating coil
Return air fan
Function:
[-999999.999 Setpoint 1 is used in closed-loop
mode to enter a setpoint reference
that is used by the frequency
converter's PID controller. See the
description of
parameter 20-20 Feedback Function.
NOTICE
The setpoint reference entered
here is added to any other
references that are enabled
(see parameter group 3-1*
References).
Danfoss A/S © 10/2019 All rights reserved.
®
VLT HVAC Drive FC 102
20-22 Setpoint 2
Range:
0
ProcessCtrl
Unit
*
20-23 Setpoint 3
Range:
0
ProcessCtrl
Unit
*
P P
Zone 1
VAV
Box
P P
Zone 2
VAV
Box
P P
Zone 3
VAV
Box
Function:
[-999999.999 Setpoint 2 is used in closed-loop
- 999999.999 mode to enter a setpoint reference
ProcessCtrlUnit for the PID controller. See the
] description of
parameter 20-20 Feedback Function.
NOTICE
The setpoint reference entered
here is added to any other
references that are enabled
(see parameter group 3-1*
References).
Function:
[-999999.999 Setpoint 3 is used in closed-loop
- 999999.999 mode to enter a setpoint reference
ProcessCtrlUnit that may be used by the frequency
] converter's PID controller. See the
description of
parameter 20-20 Feedback Function.
NOTICE
The setpoint reference entered
here is added to any other
references that are enabled
(see parameter group 3-1*
References).
M0010001