Danfoss VLT AutomationDrive FC 301 Programming Manual page 84

Parameter Descriptions
2-15 Brake Check
Option:
3 3
[3] Stop and trip
[4] AC brake
[5] Trip Lock
NOTICE
Remove a warning arising with [0] Off or [1] Warning by
cycling the mains supply. The fault must be corrected
first. For [0] Off or [1] Warning, the frequency converter
keeps running even if a fault is located.
2-16 AC brake Max. Current
Range:
100 %
*
1000.0 %]
NOTICE
Parameter 2-16 AC brake Max. Current has no effect when
parameter 1-10 Motor Construction=[1] PM, non salient
SPM.
2-17 Over-voltage Control
Option:
[0] Disabled
*
[1] Enabled (not
at stop)
82
Function:
If a fault occurs, the frequency
converter cuts out while showing
an alarm (trip lock).
Monitors 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
shown (for example, warnings 25,
27, or 28).
Monitors 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.
Function:
[ 0 - Enter the maximum allowed current
when using AC braking to avoid
overheating of motor windings.
Function:
Overvoltage control (OVC) reduces
the risk of the frequency converter
tripping due to an overvoltage on
the DC-link caused by generative
power from the load.
No OVC required.
Activates OVC except when using a
stop signal to stop the frequency
converter.
Danfoss A/S © 10/2019 All rights reserved.
®
VLT AutomationDrive FC 301/302
2-17 Over-voltage Control
Option:
[2]
NOTICE
Do not enable OVC in hoisting applications.
2-18 Brake Check Condition
Range:
[0]
*
[1]
2-19 Over-voltage Gain
Range:
100 %
*
3.3.3 2-2* Mechanical Brake
Parameters for controlling operation of an electro-magnetic
(mechanical) brake, typically required in hoisting
applications.
To control a mechanical braking, 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 frequency converter is unable to
hold the motor, for example due to an excessive load.
Select [32] Mechanical Brake Control for applications with
an electro-magnetic brake in parameter 5-40 Function Relay,
parameter 5-30 Terminal 27 Digital Output, or
parameter 5-31 Terminal 29 Digital Output. When selecting
[32] Mechanical brake control, the mechanical brake is
closed from start-up until the output current is above the
level selected in parameter 2-20 Release Brake Current.
During stop, the mechanical braking activates when the
speed drops below the level specified in
parameter 2-21 Activate Brake Speed [RPM]. If the frequency
converter enters an alarm condition, an overcurrent, or
overvoltage situation, the mechanical braking immediately
cuts in. This is also the case during Safe Torque Off.
NOTICE
Protection mode and trip delay features
(parameter 14-25 Trip Delay at Torque Limit and
parameter 14-26 Trip Delay at Inverter Fault) may delay
the activation of the mechanical braking in an alarm
condition. These features must be disabled in hoisting
applications.
Function:
Enabled Activates OVC.
Function:
At Power Up Brake check is performed at power-
up.
After Coast Brake check is performed after
Situations coast situations.
Function:
[10 - 200 %] Select overvoltage gain.
M0013101