Danfoss VLT HVAC Drive Instruction Manual page 82

6. How to program the adjustable frequency
drive
2-17
Value:
Disabled
Enabled
Function:
Overvoltage control (OVC) reduces the risk of
the adjustable frequency drive tripping due to
an overvoltage in the DC link caused by gen-
erative power from the load.
Select
Select
6
3-02
Value:
-100,000.000 – par. 3-03
Function:
Enter the Minimum Reference. The Minimum
Reference is the lowest value obtainable by
adding all references together.
3-03
Value:
Par. 3-02 - 100000.000
Function:
Enter the maximum reference. The maximum
reference is the highest value obtainable by
adding all references together.
3-10
Array [8]
Value:
-100.00% - +100.00%
82
Overvoltage Control
Disabled [0] if no OVC is required.
Enabled
[2] to activate OVC.
NOTE
The ramp time is automatically
adjusted to prevent the adjust-
able frequency drive from trip-
ping.
Minimum Reference
0.000 Unit
Maximum Reference
0.000 Unit
Preset Reference
MG.11.A4.22 - VLT
Function:
Enter up to eight different preset references
(0-7) in this parameter using array program-
[0]
ming. The preset reference is stated as a per-
[2]
centage of the value Ref
Maximum Reference
the other external references. If a Ref
ferent from 0 (Par. 3-02
is programmed, the preset reference is calcu-
lated as a percentage of the full reference
range, i.e., on the basis of the difference be-
tween Ref and Ref
MAX
ue is added to Ref
references, select Preset ref. bit 0 / 1 / 2 [16],
[17] or [18] for the corresponding digital in-
puts in parameter group 5.1* Digital Inputs.
3-15 Reference 1 Source
Value:
No function
Analog input 53
Analog input 54
Frequency input 29
Frequency input 33
Digital pot. meter
Analog input X30-11
Analog input X30-12
Analog Input X42/1
Analog Input X42/3
Analog Input X42/5
Ext. Closed-loop 1
Ext. Closed-loop 2
Ext. Closed-loop 3
0.00%
® is a registered Danfoss trademark
VLT ® HVAC Drive Instruction Manual
(par. 3-03
MAX
) or as a percentage of
dif-
MIN
Minimum Reference
)
. Afterwards, the val-
MIN
. When using preset
MIN
[0]
[1]
[2]
[7]
[8]
[20]
[21]
[22]
[23]
[24]
[25]
[30]
[31]
[32]