In order to maintain PELV, all connections made to the
control terminals must be PELV, e.g. thermistor must be
reinforced/ double insulated
NOTE
Danfoss recommends using 24 VDC as thermistor supply
voltage.
1-93 Thermistor Source
Option: Function:
Select the input to which the thermistor
(PTC sensor) should be connected. An
analog input option [1] or [2] cannot be
selected if the analog input is already in use
as a reference source (selected in
par. 3-15 Reference 1 Source,
par. 3-16 Reference 2 Source or
par. 3-17 Reference 3 Source).
When using MCB 112, choice [0] None must
always be selected.
[0]
*
None
[1] Analog input 53
[2] Analog input 54
[3] Digital input 18
[4] Digital input 19
[5] Digital input 32
[6] Digital input 33
NOTE
This parameter cannot be adjusted while the motor is
running.
NOTE
Digital input should be set to [0] PNP - Active at 24V in
par. 5-00.
2-00 DC Hold/Preheat Current
Range: Function:
50 %
*
[Applica-
tion
dependant]
Enter a value for holding current as a
percentage of the rated motor current I
M,N
set in par. 1-24 Motor Current. 100% DC
holding current corresponds to I
M,N
.
This parameter holds the motor (holding
torque) or pre-heats the motor.
This parameter is active if [1] DC hold/
Preheat is selected in par. 1-80 Function at
Stop.
NOTE
The maximum value depends on the rated motor
current.
Avoid 100 % current for too long. It may damage the
motor.
2-10 Brake Function
Option: Function:
[0]
*
Off No brake resistor installed.
[1] Resistor
brake
Brake resistor incorporated in the system, for
dissipation of surplus brake energy as heat.
Connecting a brake resistor allows a higher DC
link voltage during braking (generating
operation). The Resistor brake function is only
active in frequency converters with an integral
dynamic brake.
[2] AC brake AC Brake will only work in Compressor Torque
mode in par. 1-03 Torque Characteristics.
2-16 AC brake Max. Current
Range: Function:
100.0 %
*
[Application
dependant]
Enter the maximum permissible
current when using AC brake to avoid
overheating of motor windings. The AC
brake function is available in Flux
mode only (FC 302 only).
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.
3-02 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.
How to Programme the Frequ...
VLT
®
HVAC Drive Operating Instructions
MG.11.AD.02 - VLT
®
is a registered Danfoss trademark 73
7
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