Ext. Closed Loop 1, 4-20 mA [[143]]
Ext. Closed Loop 2, 4-20 mA [[144]]
Ext. Closed Loop 3, 4-20 mA [[145]]
Function:
Select the function of Terminal 42 as an ana-
log current output.
6-51 Terminal 42 Output Min Scale
Value:
0.00 – 200%
0%
Function:
Scale the minimum output of the selected an-
alog signal at terminal 42, as a percentage of
the maximum signal value. E.g. if 0 mA (or 0
Hz) is desired at 25% of the maximum output
value, then programme 25%. Scaling values
up to 100% can never be higher than the cor-
responding setting in par. 6-52.
6-52
Terminal 42 Output Max
Scale
Value:
0.00 – 200%
100%
Function:
Scale the maximum output of the selected an-
alog signal at terminal 42. Set the value to the
maximum value of the current signal output.
Scale the output to give a current lower than
20 mA at full scale; or 20 mA at an output be-
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,
programme the percentage value in the pa-
rameter, i.e. 50% = 20 mA. If a current be-
tween 4 and 20 mA is desired at maximum
output (100%), calculate the percentage val-
ue as follows:
20
mA
/
desired maximum current
×100%
i
.
e
.10
mA
:
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.
NB!
The output frequency value of
the frequency converter must
never exceed 1/10 of the
switching frequency. When the
motor is running, adjust the
switching frequency in par.
14-01 until the motor is as
noiseless as possible. See also
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
77
6
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