Operating instructions

2-17 Over-voltage Control
Option: Function:
Over-voltage control (OVC) reduces the risk of the
frequency converter tripping due to an over
voltage on the DC link caused by generative power
from the load.
[0] Disabled No OVC required.
[2]
* Enabled Activates OVC.
NOTE
The ramp time is automatically adjusted to avoid
tripping of the frequency converter.
3.5 Main Menu - Reference/Ramps -
Group 3
3.5.1 3-0* Reference Limits
Parameters for setting the reference unit, limits and ranges.
Please see also parameter group 20-0* for information on
settings in closed loop.
3-02 Minimum Reference
Range: Function:
Applica-
tion
depend-
ent
*
[Applica-
tion
dependant]
Enter the Minimum Reference. The
Minimum Reference is the lowest value
obtainable by summing all references.
The Minimum Reference value and unit
matches the configuration choice made
in par. 1-00 Configuration Mode and
par. 20-12 Reference/Feedback Unit,
respectively.
NOTE
This parameter is used in open
loop only.
3-03 Maximum Reference
Range: Function:
Applica-
tion
depend-
ent
*
[Applica-
tion
depend-
ant]
Enter the maximum acceptable value for
the remote reference. The Maximum
Reference value and unit matches the
configuration choice made in
par. 1-00 Configuration Mode and
par. 20-12 Reference/Feedback Unit,
respectively.
NOTE
If operating with par. 1-00 Config-
uration Mode set for Closed Loop
[3], par. 20-14 Maximum
Reference/Feedb. must be used.
3-04 Reference Function
Option: Function:
[0] * Sum Sums both external and preset reference
sources.
[1] External/
Preset
Use either the preset or the external
reference source.
Shift between external and preset via a
command on a digital input.
3.5.2 3-1* References
Parameters for setting up the reference sources.
Select the preset reference(s). Select Preset ref. bit 0 / 1 / 2 [16],
[17] or [18] for the corresponding digital inputs in parameter
group 5-1*.
3-10 Preset Reference
Array [8]
Range: Function:
0.00
%
*
[-100.00 -
100.00 %]
Enter up to eight different preset references
(0-7) in this parameter, using array program-
ming. The preset reference is stated as a
percentage of the value Ref
MAX
(par. 3-03 Maximum Reference, for closed loop
see par. 20-14 Maximum Reference/Feedb.).
When using preset references, select Preset
ref. bit 0 / 1 / 2 [16], [17] or [18] for the
corresponding digital inputs in parameter
group 5-1* Digital Inputs.
Parameter Description
VLT
®
HVAC Drive Programming Guide
48 MG.11.CA.02 - VLT
®
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