Danfoss FC 300 Design Manual page 175

FC 300 Design Guide
Select Warning [1] to monitor the brake resistor and
brake IGBT for a short-circuit, and to run a test for
brake resistor disconnection during power-up.
Select Trip [2], to monitor for a short-circuit
or disconnection of the brake resistor, or
a short-circuit of the brake IGBT. If a fault
occurs the frequency converter cuts out while
displaying an alarm (trip locked).
Select Stop and Trip [3] to monitor for a short-circuit
or disconnection of the brake resistor, or a
short-circuit of the brake IGBT. If a fault occurs
the frequency converter ramps down to coast and
then trips. A trip lock alarm is displayed.
Select AC Brake [4] to monitor for a short-circuit or
disconnection of the brake resistor, or a short-circuit
of the brake IGBT. If a fault occurs the frequency
converter performs a controlled ramp down. This
option is available for FC 302 only.
NOTE
NB!: Remove a warning arising in
connection with Off [0] or Warning
[1] by cycling the mains supply. The
fault must be corrected first. For Off [0] or
Warning [1], the frequency converter keeps
running even if a fault is located.
This parameter is only active in frequency
converters with an integral dynamic brake.
2-16 AC Brake Max. Current
Range:
0 - 200%
Function:
Enter the maximum permissible current when
using AC brake to avoid overheating motor
windings. The AC brake function is available
in Flux mode only (FC 302 only).
2-17 Over-voltage Control
Option:
*
Disabled
Enabled (not at stop)
Enabled
Function:
Over-voltage control (OVC) reduces the risk of the
drive tripping due to an over voltage on the DC link
caused by generative power from the load.
Select Disabled [0] if no OVC is required.
* default setting ( ) display text
How to Program
Select Enabled [2] to activate OVC.
Select Enabled (not at stop) [1] to activate
OVC except when using a stop signal to stop
the frequency converter.
2-2* Mechanical Brake
"
Parameters for controlling operation of an
electro-magnetic (mechanical) brake, typically
required in hoisting applications.
To control a mechanical brake, a relay output
(relay 01 or relay 02) or a programmed digital
output (terminal 27 or 29) is required. Normally
this output must be closed during periods when the
drive is unable to 'hold' the motor, e.g. due to an
excessive load. Select Mechanical Brake Control
[32] for applications with an electro-magnetic brake
in par. 5-40 Function Relay, par. 5-30 Terminal 27
Digital Output, or par. 5-31 Terminal 29 Digital
Output. When selecting Mechanical brake control
[32], the mechanical brake is closed from start up
until the output current is above the level selected
in par. 2-20 Release Brake Current. During stop,
the mechanical brake activates when the speed falls
below the level specified in par. 2-21 Activate Brake
Speed [RPM]. If the frequency converter enters an
alarm condition or an over-current or over-voltage
situation, the mechanical brake immediately cuts
in. This is also the case during safe stop.
*
100%
[0]
[1]
[2]
[ ] value for use in communication via serial communication port
MG.33.B6.22 - VLT is a registered Danfoss trademark
2-20 Release Brake Current
Range:
0.00 - par. 16-37 A
*
0.00 A
175