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 Control of Mechanical Brake. Program terminal 27 to Coast, inverse [2] or Coast and 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 decels 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. E-01 Terminal 18 Digital Input Start [8]

Quickstop via terminal 27

par. E-03 Terminal 27 Digital Input Coasting Stop, Inverse [2]

Terminal 29 Output

par. E-52 Terminal 29 Mode Terminal 29 Mode Output [1]

par. E-21 Terminal 29 Digital Output Torque Limit & Stop [27]

Relay output [0] (Relay 1)

par. E-24 Function Relay Mechanical Brake Control [32]

Illustration 8.1: Basic Set-up for AF-650 GP Closed Loop Speed

Control