Danfoss VLT AQUA Drive FC 202 Programming Manual page 66

Parameter Description
2-07 Parking Time
Range:
3 s [0.1 - 60
*
s]
3 3
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:
[0] Off
[1] Resistor
brake
[2] AC brake
2-11 Brake Resistor (ohm)
Range:
Size [ 5 -
related 65535
*
Ohm]
64
VLT
Function:
Set the duration of the parking current time set
in parameter 2-06 Parking Current. Active with
parameter 1-73 Flying Start.
NOTICE
Parameter 2-07 Parking Time is only active
when [1] PM, non-salient SPM is selected
in parameter 1-10 Motor Construction.
Function:
Available selections depend on
parameter 1-10 Motor Construction:
[0] Asynchronous:
•
[0] Off.
•
[1] Resistor brake.
•
[2] AC braking.
[1] PM non-salient:
•
[0] Off.
•
[1] Resistor brake.
No brake resistor installed.
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.
AC braking only works in compressor torque
mode in parameter 1-03 Torque Characteristics.
Function:
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 parameter 30-81 Brake Resistor (ohm).
Danfoss A/S © 05/2018 All rights reserved.
®
AQUA Drive FC 202
2-12 Brake Power Limit (kW)
Range:
Size
related 2000.000
*
kW]
2-13 Brake Power Monitoring
Option:
[0] Off
*
[1] Warning
120s
Function:
NOTICE
[ 0.001 -
This parameter is only active in
frequency converters with an
integral dynamic brake.
Set the monitoring limit of the brake
power transmitted to the resistor.
The monitoring limit is a product of the
maximum duty cycle (120 s) and the
maximum power of the brake resistor at
that duty cycle. See the formulas below.
For 200–240 V units:
2
390 × dutytime
P =
resistor R × 120
For 380–480 V units:
2
778 × dutytime
P =
resistor
R × 120
For 525–600 V units:
2
943 × dutytime
P =
resistor R × 120
Function:
NOTICE
This parameter is only active in
frequency converters with an integral
dynamic brake.
This parameter enables monitoring of the
power to the brake resistor. The power is
calculated based on the resistance
(parameter 2-11 Brake Resistor (ohm)), the DC-
link voltage, and the resistor duty time.
No brake power monitoring is required.
If power monitoring is set to [0] Off or [1]
Warning, the brake function remains active
even if the monitoring limit is exceeded. This
may lead to thermal overload of the resistor.
It is also possible to generate a warning via
a relay/digital output. The measuring
accuracy of the power monitoring depends
on the accuracy of the resistance of the
resistor (better than ±20%).
Activates a warning when the power
transmitted over 120 s exceeds 100% of the
monitoring limit (parameter 2-12 Brake Power
Limit (kW)).
The warning disappears when the
transmitted power drops below 80% of the
monitoring limit.
MG20OB02