Danfoss VLT HVAC User Manual

par. 14-00 and the section De-
rating
.
NB!
Switching frequencies higher
than 5.0 kHz lead to automatic
derating of the maximum output
of the frequency converter.
20-00 Feedback 1 Source
Value:
No Function [0]
Analog Input 53 [1]
Analog Input 54 [2]
Frequency Input 29 [3]
Frequency Input 33 [4]
Analog Input X30/11 [7]
Analog Input X30/12 [8]
Analog Input X42/1 [9]
Analog Input X42/3 [10]
Bus Feedback 1 [100]
Bus Feedback 2 [101]
Bus Feedback 3 [102]
Function:
Up to three different feedback signals can be
used to provide the feedback signal for the
frequency converter’s PID Controller.
This parameter defines which input will be
used as the source of the first feedback signal.
Analog input X30/11 and Analog input X30/12
refer to inputs on the optional General Pur-
pose I/O board.
NB!
If a feedback is not used, its
source must be set to
No Func-
tion
[0]. Parameter 20-10 deter-
mines how the three possible
feedbacks will be used by the
PID Controller.
20-01 Feedback 1 Conversion
Value:
Linear [0]
Square root [1]
Pressure to temperature [2]
Function:
This parameter allows a conversion function
to be applied to Feedback 1.
Linear [0] has no effect on the feedback.
Square root [1] is commonly used when a
pressure sensor is used to provide flow feed-
back (
(
flow ∝ pressure
)
).
Pressure to temperature 24] is used in com-
pressor applications to provide temperature
feedback using a pressure sensor. The tem-
perature of the refrigerant is calculated using
the following formula:
Temperature =
A
2
, where A1, A2 and A3
are refrigerant-specific constants. The refrig-
erant must be selected in parameter 20-20.
Parameters 20-21 through 20-23 allow the
values of A1, A2 and A3 to be entered for a
refrigerant that is not listed in parameter
20-20.
20-03 Feedback 2 Source
Function:
See
Feedback 1 Source , par. 20-00 for details.
20-04 Feedback 2 Conversion
Function:
See
Feedback 1 Conversion par. 20-01 for de-
tails.
20-06 Feedback 3 Source
Function:
See
Feedback 1 Source , par. 20-00 for details.
20-07 Feedback 3 Conversion
Function:
See
Feedback 1 Conversion , par. 20-01 for
details.
6. How to programme the frequency converter VLT
®
HVAC Drive Operating Instructions
78 MG.11.A4.02 - 09.10.06. VLT
®
is a registered Danfoss trademark
6

Danfoss VLT HVAC Specifications

General

Enclosure Rating	IP20, IP21, IP54, IP55, IP66
Storage Temperature Range	-25°C to +70°C
Output Voltage Range	0-100% of supply voltage
Communication Protocols	Modbus RTU, BACnet, Ethernet/IP, Profibus DP
Ambient Temperature Range	-10°C to +50°C (without derating)
Relative Humidity	5% to 95% non-condensing
Altitude	Up to 1000 m without derating
Cooling Method	Air cooled
Application	HVAC systems, Pumps, Fans, Compressors
Voltage Range	200-240 V, 380-500 V, 525-600 V
Frequency Range	0 Hz to 590 Hz