Programming Of Torque Limit And Stop - Danfoss AKD 5001 Manual

to 1 min. in both CT and VT. This function is used
mainly for pumps and fans, since these applications
do not require an overload torque.
The advantage of choosing a normal torque
characteristic for an oversize motor is that the frequency
converter will be able constantly to yield 100% torque,
without derating as a result of a bigger motor.
NB!:
This function cannot be chosen for AKD
5001-5006, 200-240 Volts, and AKD
5001-5011, 380-500 Volts.
Internal current regulator
The AKD 5000 features an integral current limit
regulator which is activated when the motor current,
and thus the torque, is higher than the torque
limits set in parameter 221 and 222.
When AKD 5000 Series is at the current limit
during motor operation or regenerative operation,
the frequency converter will try to get below the
preset torque limits as quickly as possible without
losing control of the motor.
While the current regulator is active, the frequency
converter can only be stopped by means of terminal
27 if set to Coasting stop, inverse [0] or Reset and
coasting stop, inverse [1]. A signal on terminals
16-33 will not be active until the frequency converter
has moved away from the current limit.
Please note that the motor will not use the
ramp-down time, since terminal 27 must be
programmed for Coasting stop, inverse [0] or
Reset and coasting stop, inverse [1].

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, while at the same time activating
the external electro-mechanical brake.
The example given below illustrates the programming
of frequency converter connections.
The external brake can be connected to relay 01 or
04, see Control of mechanical brake on page 66.
Program terminal 27 to Coasting stop, inverse [0]
or Reset and coasting stop, inverse [1], as well as
terminal 42 to Torque limit and stop [27].
58
AKD 5000
Description:
If a stop command is active via terminal 18 and
the frequency converter is not at the torque limit,
the motor will ramp down to 0 Hz.
If the frequency converter is at the torque limit and
a stop command is activated, terminal 42 Output
(programmed to Torque limit and stop [27]) will be
activated. The signal to terminal 27 will change from
'logic 1' to 'logic 0' and the motor will start coasting.
- Start/stop via terminal 18.
Parameter 302 = Start [1].
- Quickstop via terminal 27.
Parameter 304 = Coasting stop, inverse [0].
- Terminal 42 Output
Parameter 319 = Torque limit and stop [27].
- Terminal 01 Relay output
Parameter 323 = Mechanical brake control [32].
MG.50.R3.02 -