5-122
F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J codes
d codes
U codes
y codes
Ch
ap
. 5
FUNCTION C
O
DES
Running/stopping the motor
Under torque control, the inverter does not control the speed, so it does not perform acceleration or deceleration by
soft-start and stop (acceleration/deceleration time) at the time of startup and stop. Turning ON a run command
starts the inverter to run and output the commanded torque. Turning it OFF stops the inverter so that the motor
coasts to a stop.
At the start of torque control under the "Vector control without speed sensor," the starting operation differs
depending upon whether auto search is enabled or disabled by d67 as shown below.
Data for d67
Operation
0: Disable
1: Enable (At restart after
momentary power failure)
At startup, the inverter first starts at zero frequency. Then it accelerates
according to a torque command.
Select this operation for use in which the motor is surely stopped before
startup.
2: Enable (At normal start and
at restart after momentary
power failure)
At startup, the inverter searches for idling motor speed and restarts
running the motor at the frequency based on the searched speed. Then it
starts torque control.
H26, H27
Thermistor (for motor) (Mode selection and Level)
These function codes specify the PTC (Positive Temperature Coefficient)/NTC (Negative Temperature Coefficient)
thermistor embedded in the motor. The thermistor is used to protect the motor from overheating or output an alarm signal.
Thermistor (for motor) (Mode selection) (H26)
H26 selects the function operation mode (protection or alarm) for the PTC/NTC thermistor as shown below.
Data for H26
Action
0 Disable
1
Enable
When the voltage sensed by PTC thermistor exceeds the detection level, motor protective function
(alarm
0h4
) is triggered, causing the inverter to enter an alarm stop state.
2
Enable
When the voltage sensed by the PTC thermistor exceeds the detection level, a motor alarm signal is
output but the inverter continues running. You need to assign the "Motor overheat detected by
thermistor" signal (THM) to one of the digital output terminals beforehand, by which a temperature
alarm condition can be detected by the thermistor (PTC) (E20 to E24 and E27, data = 56).
3
Enable
When the inverter is connected with the NTC thermistor built into the motor exclusively designed
for vector control, the inverter senses the motor temperature and uses the information for control.
If the motor overheats and the temperature exceeds the protection level, the inverter issues the
Motor protection alarm 0h4 and stops the motor.
If H26 data is set to "1" or "2" (PTC thermistor), the inverter monitors the voltage sensed by PTC thermistor and protect the
motor even when any of the 2nd to 4th motors is selected. If H26 data is set to "3" (NTC thermistor) and any of the 2nd to
4th motors is selected, the inverter does not perform these functions.
Thermistor (for motor) (Level) (H27)
Data setting range: 0.00 to 5.00 (V)
H27 specifies the detection level (expressed in voltage) for the temperature sensed by the PTC thermistor.
The alarm temperature at which the overheat protection becomes activated depends on the characteristics of the PTC
thermistor. The internal resistance of the thermistor will significantly change at the alarm temperature. The detection level
(voltage) is specified based on the change of the internal resistance.
Summary of Contents for FRENIC-MEGA
Page 36: ...2 6 Unit inch mm Refer to Section 2 3 3 9...
Page 356: ...MEMO...
