Programming Of Torque Limit And Stop - Danfoss VLT Decentral Drive FCD 302 Design Manual

Application Examples
1-00 Configuration Mode determines what type of
application control principle (that is, Speed, Torque or
Process Control) is used when the remote reference is
active. 1-05 Local Mode Configuration determines the type
of application control principle that is used when the local
reference is active. One of them is always active, but both
cannot be active at the same time.

4.7 Programming of Torque Limit and Stop

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.
Program terminal 27 to [2] Coast, inverse or [3] Coast and
Reset, inverse , and program terminal 29 to Terminal mode
29 [1] Output and [27] Torque limit & stop.
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
5-10 Terminal 18 Digital Input [8] Start
- Quickstop via terminal 27
5-12 Terminal 27 Digital Input [2] Coasting Stop,
Inverse
- Terminal 29 Output
5-02 Terminal 29 Mode [1] Terminal 29 Mode
Output
5-31 Terminal 29 Digital Output [27] Torque Limit &
Stop
- [0] Relay output (Relay 1)
5-40 Function Relay [32] Mechanical Brake Control
®
VLT Decentral Drive FCD 302
Illustration 4.21 Mechanical Brake Control
Item
1
2
3
Table 4.26 Legend
®
MG04H102 - VLT is a registered Danfoss trademark
I max 0.1 Amp
1
-
24 VDC
+
P 5-40 [0] [32]
2
Description
External 24 V DC
Mechanical brake connection
Relay 1
3
4
65
4