Parameter set-up:
Set
parameter 1-90 Motor Thermal Protection
to
[2]
Thermistor Trip
Set
parameter 1-93 Thermistor Source
to
[6] Digital Input
PTC / Thermistor
OFF
ON
+24V
12 13 18
37
32
A
27
19
29
33
B
20
GND
R
<6.6 k Ω >10.8 k Ω
130BA151.11
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
2-10 Brake Function
Option:
Function:
[0] Off
No brake resistor is installed.
[1] Resistor
brake
A brake resistor is incorporated in the system, for
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
plus
and flux mode in both
open-loop and closed-loop.
2-11 Brake Resistor (ohm)
Range:
Function:
Size
related
*
[ 5.00 -
65535.00
Ohm]
Set the brake resistor value in
Ω
. This
value is used for monitoring the power
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
related
*
[ 0.001 -
2000.000
kW]
Parameter 2-12 Brake Power Limit (kW)
The
expected average power dissipated in the
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:
Pbr,avg W =
Ubr
2 V ×tbr s
Rbr Ω ×Tbr s
P
br,avg
is the average power dissipated in
the brake resistor
R
br
is the resistance of the brake resistor.
t
br
is the active breaking time within the
120 s period, T
br
.
Programming
Instruction Manual
MG37A222
Danfoss A/S © Rev. 2014-02-07 All rights reserved.
59
6
6
Summary of Contents for VLT AutomationDrive FC 302
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