In applications with an external electro-mechanical brake, such as hoisting applications, it is possible to stop the frequency converter via a 'standard' stop

command and simultaneously activate the external electro-mechanical brake.

The example given below illustrates the programming of frequency converter connections.

The external brake can be connected to relay 1 or 2, see paragraph

Reset, inverse [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 frequency converter is not at the torque limit, the motor ramps down to 0 Hz.

If the frequency converter is at the torque limit and a stop command is activated, terminal 29 Output (programmed to Torque limit and stop [27]) is

activated. The signal to terminal 27 changes from 'logic 1' to 'logic 0', and the motor starts to coast, thereby ensuring that the hoist stops even if the

frequency converter itself cannot handle the required torque (i.e. due to excessive overload).

Start/stop via terminal 18

Par. 5-10 Start [8]

Quickstop via terminal 27

Par. 5-12 Coasting Stop, 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)

Par. 5-40 Mechanical Brake Control [32]

Illustration 7.1: Basic Set-up for FC 302 Closed Loop

Speed Control