2-07 Parking Time
Range:
Function:
3 s
*
[0.1 - 60
s]
Set the duration of the parking current time set
in
parameter 2-06 Parking Current
. Active in
connection with
.
NOTICE
is only active
when
[1] PM, non-salient SPM
is selected
in
1-10 Motor Construction
.
3.4.2 2-1* Brake Energy Funct.
Parameter group for selecting dynamic brake parameters.
Only valid for frequency converters with brake chopper.
2-10 Brake Function
Option:
Function:
Available selections depend on
parameter 1-10 Motor Construction
[0] Asynchron:
[0] Off
[1] Resistor brake
[2] AC brake
[1] PM non-salient:
[0] Off
[1] Resistor brake
[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 only works in compressor torque mode
in
parameter 1-03 Torque Characteristics
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
parameter 2-13 Brake Power Monitoring
This parameter is only active in
frequency converters with an integral
dynamic brake.
Use this parameter for values without
decimals. For a selection with 2 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)
is
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 Average
and thereby
specifies when a warning/alarm is to be
given.
To calculate
, the following formula can be
used.
P
br, avg
W =
U
br
2
V × t
br
s
R
br
Ω × T
br
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
.
U
br
is the DC voltage where the brake
resistor is active. This depends on the
unit as follows:
T2 units: 390 V
T4 units: 778 V
T5 units: 810 V
T6 units: 943 V/1099 V for D – F frames
T7 units: 1099 V
NOTICE
If R
br
is not known, or if T
br
is
different from 120 s, the practical
approach is to run the brake
application, readout
16-33 Brake
Energy Average
and then enter this
+ 20% in
2-12 Brake Power Limit
(kW)
.
Parameter Descriptions
Programming Guide
MG11CE02
Danfoss A/S © 03/2015 All rights reserved.
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