Danfoss VLT AutomationDrive FC 300 Instruction Manual page 58

4 How to Program
[4] AC brake
[5] Trip Lock
NOTE!
Remove a warning arising in connection with
For Off [0] or
This parameter is only active in adjustable frequency drives with an integral dynamic brake.
4
4.3.1 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 adjustable frequency drive is unable to 'hold' the motor, e.g., due to an excessive load. Select
Control
[32] for applications with an electro-magnetic brake in par. 5-40
digital Output
. When selecting
Release Brake Current
selected in par. 2-20
Brake Speed [RPM]
. If the adjustable frequency drive enters an alarm condition or an overcurrent or overvoltage situation, the mechanical brake imme-
diately cuts in. This is also the case during safe stop.
NOTE!
Protection mode and trip delay features (par. 14-25
the activation of the mechanical brake in an alarm condition. These features must be disabled in hoisting applications.
4-12
Monitors for a short-circuit or disconnection of the brake resistor, or a short-circuit of the brake
IGBT. If a fault occurs, the adjustable frequency drive performs a controlled ramp-down. This option
is available for FC 302 only.
Off [0] or
Warning [1], the adjustable frequency drive keeps running even if a fault is located.
Mechanical brake control
[32], the mechanical brake is closed from start up until the output current is above the level
. During stop, the mechanical brake activates when the speed falls below the level specified in par. 2-21
MG.33.AG.22 - VLT
VLT
Warning [1] by cycling the line power supply. The fault must be corrected first.
Function Relay Terminal 27 Digital Output
, par. 5-30
Trip Delay at Torque Limit and par. 14-26
®
is a registered Danfoss trademark
® AutomationDrive FC 300 Instruction
Mechanical Brake
Terminal 29
, or par. 5-31
Trip Delay at Inverter Fault ) may delay
Manual
Activate