Danfoss FC 300 Design Manual page 50

3. Introduction to FC 300
3
In hoisting/lowering applications, it must be possible to control an electro-mechanical brake.
Step-by-step Description
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To control the mechanical brake, any relay output or digital output (terminal 27 or 29)
can be used. If necessary, use a suitable contactor.
Ensure that the output is switched off as long as the adjustable frequency drive is unable
to drive the motor, such as when the load is too heavy or the motor has not been moun-
ted, for example.
Mechanical brake control
Select
mechanical brake.
The brake is released when the motor current exceeds the preset value found in par.
2-20.
The brake is engaged when the output frequency is less than the frequency found in par.
2-21 or 2-22, and only if the adjustable frequency drive carries out a stop command.
NOTE
For vertical lifting or hoisting applications, ensuring that the load can be stopped in
case of an emergency or the malfunction of a single part (e.g., a contactor) is
strongly recommended.
If the adjustable frequency drive is in alarm mode or in an overvoltage situation, the
mechanical brake cuts in.
NOTE
For hoisting applications, make sure that the torque limits in par. 4-16 and 4-17 are
set lower than the current limit in par. 4-18. Also it is recommendable to set par.
Trip Delay at Torque Limit
14-25,
Line Failure
"0" and par. 14-10,
MG.33.B9.22 - VLT
[32] in par. 5-4* (or in par. 5-3*) before connecting the
Trip Delay at Inverter Fault
to "0", par. 14-26,
Coasting
to "[3], ".
® is a registered Danfoss trademark.
FC 300 Design Guide
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