Trane TR170 - Main Menu - Special Functions - Group

3.10 Main Menu - Special Functions - Group
14
3.10.1 14-0* Inverter Switching
14-01 Switching Frequency
Option: Function:
Select the inverter switching frequency. Changing
the switching frequency can help to reduce
acoustic noise from the motor.
NOTICE
High switching frequencies increase heat
generation in the frequency converter and
may reduce its lifetime.
NOTICE
Not all options are available in all power
sizes.
NOTE: The output frequency value of the
frequency converter must never exceed 1/10 of
the switching frequency. When the motor runs,
adjust the switching frequency in
parameter 14-01 Switching Frequency until the
motor is as noiseless as possible. See also
parameter 14-00 Switching Pattern and the section
Derating.
[0] Ran3 3 kHz true random PWM (white noise
modulation).
[1] Ran5 5 kHz true random PWM (white noise
modulation).
[2] 2.0 kHz
[3] 3.0 kHz
[4] 4.0 kHz
[5] 5.0 kHz
[6] 6.0 kHz
[7] 8.0 kHz
[8] 10.0 kHz
[9] 12.0 kHz
[10] 16.0 kHz
14-03 Overmodulation
Option: Function:
[0] * O Selects no overmodulation of the output voltage to
avoid torque ripple on the motor shaft.
[1] On The overmodulation function generates an extra
voltage of up to 8% of U
max
output voltage without
overmodulation, which results in an extra torque of
10–12% in the middle of the over-synchronous range
(from 0% at nominal speed rising to approximately
12% at double nominal speed).
14-07 Dead Time Compensation Level
Range: Function:
Size
related
*
[0 -
100 ]
Level of applied dead time compensation
in percentage. A high level (>90%)
optimizes the dynamic motor response. A
level 50–90% is suitable for both motor-
torque-ripple minimization and motor
dynamics. A 0 level turns o the dead
time compensation.
14-08 Damping Gain Factor
Range: Function:
Size related * [0 -
100 %]
Set the damping factor for DC-link
voltage compensation. See
parameter 14-51 DC-Link Voltage
Compensation.
14-09 Dead Time Bias Current Level
Range: Function:
Size related * [0 - 100 %] To add to the current-sense signal for
dead time compensation for some
motors, set a bias signal (in
percentage).
3.10.2 14-1* Mains On/O
Parameters for conguring mains failure monitoring and
handling.
14-10 Mains Failure
Congure the action of the frequency converter when the mains
voltage is below the mains voltage limit congured in
parameter 14-11 Mains Voltage at Mains Fault.
Option: Function:
[0] * No function
[3] Coasting
14-11 Mains Voltage at Mains Fault
Range: Function:
Size related * [100 -
800 V]
Use this parameter to dene at which
AC voltage the function selected in
parameter 14-10 Mains Failure should
be activated.
14-12 Function at Mains Imbalance
Option: Function:
NOTICE
Selecting this option may reduce the life
time of the frequency converter.
Operation under severe mains imbalance
conditions reduces the lifetime of the motor. If
the motor is operated continuously near nominal
load, conditions are considered severe.
Parameters Programming Guide
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