Programming Of Torque Limit And Stop - Danfoss FC 300 Design Manual

FC 300 Design Guide

Programming of Torque Limit and Stop

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In applications with an external electromechanical brake, such as hoisting applications,
it is possible to stop the adjustable frequency drive via a "standard" stop command and
simultaneously activate the external electromechanical brake.
The example given below illustrates the programming of adjustable frequency drive connections.
The external brake can be connected to relay 1 or 2, see paragraph Control of Mechanical Brake.
Program terminal 27 to Coast inverse [2] or Coast and reset inv. [3], and program terminal
29 to Terminal mode 29 Output [1] and Torque limit stop [27].
Description:
If a stop command is active via terminal 18 and the adjustable frequency drive is not
at the torque limit, the motor ramps down to 0 Hz.
If the adjustable frequency drive is at the torque limit and a stop command is activated, terminal 29 Output
(programmed to Torque limit stop [27]) is activated. The signal to terminal 27 l changes from "logic 1"
to "logic 0", and the motor starts to coast, thereby ensuring that the hoist stops even if the adjustable
frequency drive itself cannot handle the required torque (i.e. due to excessive overload).
Start/stop via terminal 18
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Par. 5-10 Start [8]
Quickstop via terminal 27
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Par. 5-12 Coast inverse [2]
- Terminal 29 Output
Par. 5-02 Terminal 29 Mode Output [1]
Par. 5-31 Torque limit stop [27]
Relay output [0] (Relay 1)
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Par. 5-40 Mech. Brake Control [32]
Application Examples
MG.33.B6.22 - VLT is a registered Danfoss trademark
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