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Honeywell HVAC232 Series Applications Manual page 98


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Torque boost
When this parameter has been activated, the voltage to the motor changes
automatically with high load torque which makes the motor produce suffi-
cient torque to start and run at low frequencies. The voltage increase de-
pends on the motor type and power. Automatic torque boost can be used in
applications with high load torque, in conveyors.
0 = Disabled
1 = Enabled
In high torque - low speed applications - it is likely that the motor
will overheat. If the motor has to run a prolonged time under
these conditions, special attention must be paid to cooling the
motor. Use external cooling for the motor if the temperature
tends to rise too high.
The best performance can be reached by running motor
identification, see „Motor identification" on page 98
Switching frequency
Motor noise can be minimised using a high switching frequency. Increasing
the switching frequency reduces the capacity of the frequency converter
Switching frequency for HVAC232/402: 1.5...16 kHz.
Application manual HVAC232/402 | Document 27-652 | Issue ENG06 | 2019-08-07
Motor identification
0 = Not active
1 = Standstill identification
When Standstill identification is selected, the drive will perform an ID-run
when it is started from selected control place. Drive has to be started within
20 seconds, otherwise identification is aborted.
The drive does not rotate the motor during Standstill identification. When
ID run is ready the drive is stopped. Drive will start normally, when the next
start command is given.
After end the identification, the drive need stop the start command. If con-
trol place is Keypad, user need press stop button. If control place is IO,user
need put DI (Control signal) inactivate. If control place is fieldbus, user need
set the control bit to 0.
The ID run improves the torque calculations and the automatic torque boost
function. It will also result in a better slip compensation in speed control
(more accurate RPM).
The parameters below will change after ID run successfully,
P1.8 Motor control mode
P1.9 U / f ratio
P1.12 U / f mid point frequency
P1.13 U / f mid point voltage
P1.14 Zero freq voltage
P1.17 Motor identification(1
P1.18 Rs voltage drop
The nameplate data of the motor has to be set BEFORE doing ID

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