Danfoss VLT HVAC - Page 81

erences that are enabled (see
par. group 3-1*).
20-93 PID Proportional Gain
Value:
0.00 = Off - 10.00
0.50
Function:
This parameter adjusts the output of the fre-
quency converter’s PID Controller based on
the error between the feedback and the set-
point reference. Quick PID Controller re-
sponse is obtained when this value is large.
However, if too large of a value is used, the
frequency converter’s output frequency may
become unstable.
20-94 PID Integral Time
Value:
0.01 - 10000.00 = Off s
20.00 s
Function:
The integrator adds over time (integrates) the
error between the feedback and the setpoint
reference. This is required to ensure that the
error approaches zero. Quick frequency con-
verter speed adjustment is obtained when this
value is small. However, if too small of a value
is used, the frequency converter’s output fre-
quency may become unstable.
22-21 Low PowerDetection
Value:
Disabled [0]
Enabled [1]
Function:
If selecting Enabled, the Low Power Detection
commissioning must be carried out in order to
set the parameters in group 22-3* for proper
operation!
22-22 Low Speed Detection
Value:
Disabled [0]
Enabled [1]
Function:
Select Enabled for detecting when the motor
operates with a speed as set in par. 4-11 or
4-12,
Motor Low Limit .
22-23 No-Flow Function
Value:
Off [0]
Sleep Mode [1]
Warning [2]
Alarm [3]
Function:
Common actions for Low Power Detection and
Low Speed Detection (Individual selections
not possible).
Warning: Messages in the Local Control Panel
display (if mounted) and/or signal via a relay
or a digital output.
Alarm: The frequency converter trips and mo-
tor stays stopped until reset.
22-24 No-Flow Delay
Value:
0-600 sec.
10 sec.
Function:
Set the time Low Power/Low Speed must stay
detected to activate signal for actions. If de-
tection disappears before run out of the timer,
the timer will be reset.
22-26 Dry Pump Function
Value:
Off [0]
Warning [1]
Alarm [2]
Function:
Low Power Detection must be Enabled (par.
22-21) and commissioned (using either par.
22-3*,
No Flow Power Tuning , or Auto Set-
VLT
®
HVAC Drive Operating Instructions 6. How to programme the frequency converter
MG.11.A4.02 - 09.10.06. VLT
®
is a registered Danfoss trademark 81
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