Installation manual

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S1A53838 09/2011 57
tHr [Motor thermal prot.]
Motor Rated Current Overload Setting 10 to 100% of the
drive’s output cur-
rent rating
100%
Set parameter tHr to the motor’s rated current as indicated on the motor nameplate for the selected operating voltage.
If parameter [Unit value selection] (F701) is set to 1 (see page 120
), parameter tHr will be adjusted in amperes.
If parameter F701 is set to 0, parameter tHr will be adjusted in percentage. In this case, divide the motor rated current by
the drive rated current (as listed on its nameplate) and set parameter tHr to the resulting percentage.
The setting of parameter [Switch. freq. level] (F300) does not change the drive’s rated current for the sake of this calculation
(see page 85
).
FM [AO scaling]
Analog output scaling -
Parameter FM is used to match the FM terminal output signal with the input requirements of the attached panel meter by adjusting
the slope and bias of the analog output signal. Before adjusting FM, set FMSL to either 15 or 17. As you adjust the value of
FM, monitor the display on the attached panel meter. When the meter display reaches 100%, press the ENT key on the drive
display terminal. The drive will flash between FM and the adjusted value, indicating that the adjustment has been saved.
Pt [Mot cont. mode sel.]
Motor control mode 1
0
1
2
3
4
5
6
[Constant V/Hz]: Constant V/Hz
Use constant V/Hz mode for loads that require the same torque at low speeds as at rated speeds. Low speed torque can be ad-
justed manually by setting parameter [Motor Voltage Boost] (ub) (see page 68
).
[Variable Torque]: Variable torque
Use variable torque mode for loads such as centrifugal fans and pumps whose torque requirements increase as a square of the
increase in motor speed. Low speed torque can be adjusted manually by setting parameter ub.
[Cst V/Hz+Boost]: Constant V/Hz with automatic torque boost
See the diagram on page 66
.
This mode is similar to the constant V/Hz mode (for loads that require the same torque at low speeds as at rated speeds), except
it automatically increases motor voltage and torque to compensate for increases in load.
[SVC]: Sensorless vector control
Use sensorless vector control mode to increase torque at motor speeds below 3 Hz or to improve speed regulation (0.5 to 1%).
See diagram on page 66
.
[Economy]: Energy saving
In energy savings mode, the ATV212 drive monitors motor loading and automatically modulates the voltage applied to the motor
to optimize energy consumption.
If the ATV212 drive and the connected motor have the same power rating, and if the motor has a nominal 1500 rpm rating, no
motor auto-tuning is required to use this motor control mode. Otherwise, follow the steps outlined in “Motor Tuning” on page 70
.
[Do not use]: Reserved
[Do not use]: Reserved
Code Name / Description Adjustment range Factory setting
0
Motor rated voltage
Motor Voltage Boost
Motor Rated Frequency
Output Frequency (Hz)
Output Voltage (%)
0
Motor rated voltage
Motor Voltage Boost
Motor Rated Frequency
Output Frequency (Hz)
Output Voltage (%)