GE AF-650 GP Programming Manual page 166

3.20.2 B-1# Brake Energy Funct.
Parameters to configure the dynamic braking functions in the drive. Note! This applies only to drives ordered with the optional factory installed brake chopper
option.
B-10 Brake Function
Option:
[0] * Off
[1] Resistor brake
[2] AC brake
B-11 Brake Resistor (ohm)
Range:
50. Ohm* [5. - 65535. Ohm]
B-12 Brake Power Limit (kW)
Range:
5.000 kW* [0.001 - 2000.000 kW]
For 200 - 240 V units:
For 380 - 480 V units
For 380 - 500 V units
For 575 - 600 V units
This parameter is only active in frequency converters with optional factory installed Brake Chopper..
B-13 Braking Thermal Overload
Option:
[0] * Off
[1] Warning
[2] Trip
[3] Warning and trip
Function:
No brake resistor is installed.
A brake resistor is 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.
Is selected to improve braking without using a brake resistor. This parameter controls an overmagneti-
zation 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 over voltage limit. Please note that AC brake is not as effective as dynamic breaking with
resistor.
AC brake is for Adv. Vector Control and flux mode in both open and closed loop.
Function:
Set the brake resistor value in Ohms. This value is used for monitoring the power to the brake resistor in
par. B-13 Braking Thermal Overload. This parameter is only active in frequency converters with an integral
dynamic brake.
If the selection is xxxx use this parameter. If the selection is xxx.xx, use par. C-23 Quick Stop Decel Time.
Function:
Set the monitoring limit of the brake power transmitted to the resistor.
The monitoring limit is a product of the maximum duty cycle (120 sec.) and the maximum power of the
brake resistor at that duty cycle. See the formula below.
390 2 ×
dutytime
P resistor
=
R
× 120
778 2 ×
dutytime
P resistor
=
R × 120
810 2 ×
dutytime
P resistor =
R
× 120
943 2 ×
dutytime
P resistor
=
R
× 120
Function:
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 on the
basis of the resistance (par. B-11 Brake Resistor (ohm)), the DC link voltage, and the resistor duty time.
No brake power monitoring required.
Activates a warning on the display when the power transmitted over 120 s exceeds 100% of the moni-
toring limit (par. B-12 Brake Power Limit (kW) ).
The warning disappears when the transmitted power falls below 80% of the monitoring limit.
Trips frequency converter and displays an alarm when the calculated power exceeds 100% of the mon-
itoring limit.
AF-650 GP Programming Guide
3
165