Danfoss VLT AutomationDrive FC 302 Instruction Manual page 61

Programming
Parameter set-up:
Set parameter 1-90 Motor Thermal Protection to [2]
Thermistor Trip
Set parameter 1-93 Thermistor Source to [6] Digital Input
12 13 18 19 27 29 32 33 20 37
PTC / Thermistor
Figure 6.6 Klixon Example
1-93 Thermistor Source
Option: Function:
NOTICE!
This parameter cannot be adjusted
while the motor is running.
NOTICE!
Set digital input to [0] PNP - Active at
24 V in 5-00 Digital I/O Mode.
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
3-15 Reference 1 Source, 3-16 Reference 2
Source or 3-17 Reference 3 Source).
When using MCB 112, option [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
MG37A222
Instruction Manual
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<6.6 k Ω >10.8 k Ω R
Danfoss A/S © Rev. 2014-02-07 All rights reserved.
2-10 Brake Function
Option: Function:
[0] Off No brake resistor is installed.
[1] Resistor A brake resistor is incorporated in the system, for
brake dissipating 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
adjustable frequency drives with an integral
dynamic brake.
[2] AC brake Is selected to improve braking without using a
brake resistor. This parameter controls an
overmagnetization of the motor when running
with a generatoric load. This function can improve
the OVC function. Increasing the electrical losses
in the motor allows the OVC function to increase
the braking torque without exceeding the
overvoltage limit. Note that AC brake is not as
effective as dynamic braking with a resistor.
AC brake is for VVC
open-loop and closed-loop.
2-11 Brake Resistor (ohm)
Range: Function:
Set the brake resistor value in Ω. This
Size [ 5.00 -
related 65535.00
value is used for monitoring the power
*
Ohm]
to the brake resistor in 2-13 Brake
Power Monitoring. This parameter is
only active in adjustable frequency
drives with an integral dynamic brake.
Use this parameter for values without
decimals. For a selection with two
decimals, use 30-81 Brake Resistor (ohm).
2-12 Brake Power Limit (kW)
Range: Function:
Size [ 0.001 - Parameter 2-12 Brake Power Limit (kW) The
related 2000.000 expected average power dissipated in the
*
kW] brake resistor over a period of 120 s. It is
used as the monitoring limit for
16-33 Brake Energy /2 min and specifies
when a warning/alarm is issued.
To calculate 2–12 Brake Power Limit (kW),
use the following formula:
P br,avg W =
P is the average power dissipated in
br,avg
the brake resistor
R is the resistance of the brake resistor.
br
t is the active breaking time within the
br
120 s period, T
plus
and flux mode in both
U br 2 V × t br s
R br Ω × T br s
.
br
59
6 6