Danfoss FC 100 Series Operating Instructions Manual page 73

How to Programme the Frequ...
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- Enter a value for holding current as a
*
tion percentage of the rated motor current I
dependant]
set in par. 1-24 Motor Current. 100% DC
holding current corresponds to I
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.
®
VLT HVAC Drive Operating Instructions
2-10 Brake Function
Option:
[0]
[1]
[2]
2-16 AC brake Max. Current
Range:
100.0 %
2-17 Over-voltage Control
Option:
[0]
[2]
NOTE
The ramp time is automatically adjusted to avoid
tripping of the frequency converter.
3-02 Minimum Reference
Range:
Applica-
tion
depend-
ent
M,N
.
M,N
®
MG.11.AD.02 - VLT is a registered Danfoss trademark
Function:
Off No brake resistor installed.
*
Resistor Brake resistor incorporated in the system, for
brake 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.
AC brake AC Brake will only work in Compressor Torque
mode in par. 1-03 Torque Characteristics.
Function:
[Application Enter the maximum permissible
*
dependant] current when using AC brake to avoid
overheating of motor windings. The AC
brake function is available in Flux
mode only (FC 302 only).
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.
Disabled No OVC required.
Enabled Activates OVC.
*
Function:
[Applica- Enter the Minimum Reference. The
tion Minimum Reference is the lowest value
dependant] 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.
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