Parameter 2-17 Over-voltage Control
Table 159: Parameter 2-17 Over-voltage Control
2-17 Over-voltage Control
Default value: [0] Disabled
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint8
Change during operation: True
Overvoltage control (OVC) reduces the risk of the drive tripping due to an overvoltage on the DC-link caused by generative power
from the load.
N O T I C E
Do not enable OVC in hoisting applications.
Option
Name
Description
[0]*
Disabled
No OVC required.
[1]
Enabled (not at stop)
Activates OVC except when using a stop signal to stop the drive.
[2]
Enabled
Activates OVC.
Parameter 2-18 Brake Check Condition
Table 160: Parameter 2-18 Brake Check Condition
2-18 Brake Check Condition
Default value: [0] At power up
Parameter type: Option
Setup: All setups
Conversion index: –
Data type: Uint8
Change during operation: True
Option
Name
Description
[0]*
At power up
Brake check at power up.
[1]
After coast situations
Brake check is performed after cost situations.
Parameter 2-19 Over-voltage Gain
Table 161: Parameter 2-19 Over-voltage Gain
2-19 Over-voltage Gain
Default value: 100%
Parameter type: Range, 10 - 200%
Setup: All setups
Conversion index: 0
Data type: Uint16
Change during operation: True
Select overvoltage gain.
4.3.3 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 drive 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
,
parame-
ter 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 drive enters an alarm condition, an overcurrent, or overvoltage situation, the mechanical braking immediately
cuts in. This is also the case during Safe Torque Off.
AU373327181955en-000101 / 130R1208
102 | Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide
