Mitsubishi Electric FR-F740 EC Instruction Manual page 242

Selection and protection of a motor
When using terminal 2 as a PTC thermistor input, the input PTC thermistor resistance can be
displayed. To display the PTC thermistor resistance, set "64" in Pr. 52 "DU/PU main display data
selection", Pr. 774 "PU/DU monitor selection 1", Pr. 775 "PU/DU monitor selection 2", or Pr. 776
"PU/DU monitor selection 3" (refer to sections 6.10.2 and 6.23.4).
To monitor the PTC thermistor resistance via communication options, set as follows:
Communication option
FR-A7NC (CC-Link)
FR-A7NL (LonWorks)
FR-A7ND (DeviceNet)
CFR-A7NP (Profibus)
FR-A7NF (FL remote)
Tab. 6-10:
For details, refer to the instruction manuals of each plug-in option.
Terminal 10 calibration for PTC thermistor (Pr. 986)
When using terminal 2 as PTC thermistor input, voltage calibration of terminal 10 is available.
● If the read value of Pr. 986 is a voltage data (Pr. 986 ≠ "9999"), the calibration is not
necessary.
● If the read value of Pr. 986 is "9999", the calibration of terminal 10 is necessary. Measure
the voltage between terminal 10 and terminal 5 with a voltmeter, and set the voltage in
Pr. 986.
● If the above calibration method is unavailable (e.g because no measuring device is
available), short between terminal 10 and terminal 2, and set "8888" in Pr. 986.
NOTES
When the combination of the main circuit board and control circuit has been changed, check
the read value of Pr. 986. If the read value is "9999", calibrate the terminal 10.
Calibrate when the main circuit power is ON.
Pr. 986 is not displayed in the initial value change list (refer to page 5-19).
6 - 92
Setting
Monitor code: H40
Monitor code (nviInvMonCode): H0040
Class: 0x80, Instance: 1, Attribute: 74
PPO type support specification PNU: P1.64
(PNU number 1, Sub-Index number 64)
PPO type non-support specification IND: 0000
H1000020E
Communication options settings for monitoring the PTC thermistor resistance
Parameter
, PNU: 3F
H H