Danfoss VLT HVAC, Инструкция по эксплуатации, Страница: 89 / 156

low 100% of the maximum signal value. If 20
mA is the desired output current at a value
between 0 - 100% of the full-scale output,
program the percentage value in the param-
eter, i.e., 50% = 20 mA. If a current between
4 and 20 mA is desired at maximum output
(100%), calculate the percentage value as fol-
lows:
20 mA/ desired maximum current × 100 %
i.e. 10mA : 20 mA
10 mA × 100 % = 200 %
14-01 Switching Frequency
Value:
1.0 kHz [0]
1.5 kHz [1]
2.0 kHz [2]
2.5 kHz [3]
3.0 kHz [4]
3.5 kHz [5]
4.0 kHz [6]
5.0 kHz [7]
6.0 kHz [8]
7.0 kHz [9]
8.0 kHz [10]
10.0 kHz [11]
12.0 kHz [12]
14.0 kHz [13]
16.0 kHz [14]
Function:
Select the inverter switching frequency.
Changing the switching frequency can help to
reduce acoustic noise from the motor.
NOTE
The output frequency value of
the adjustable frequency drive
must never exceed 1/10 of the
switching frequency. When the
motor is running, adjust the
switching frequency in par. 4-01
until the motor is as noiseless as
possible. See also par. 14-00
and the section
Derating .
NOTE
Switching frequencies higher
than 5.0 kHz lead to automatic
derating of the maximum output
of the adjustable frequency
drive.
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
adjustable frequency drive’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.
NOTE
If a feedback is not used, its
source must be set to
No Func-
tion
[0]. Parameter 20-10 deter-
VLT ® HVAC Drive Instruction Manual
6. How to program the adjustable frequency
drive
MG.11.A4.22 - VLT
®
is a registered Danfoss trademark
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