Mitsubishi Electric FR-A700 Technical Manual page 59

(3) When using terminal TH1 and TH2(FR-
A7AZ) ( )
A700
When using a dedicated motor with thermistor for vector
control (SF-V5RU
temperature detected by the motor side thermistor to the
inverter can reduce fluctuation of torque generated due to
temperature.
Torque accuracy is ±3%.
Also, when [Pr. 407 ≠ "9999"], thermal protection function
by the motor thermistor is valid.
When [Pr. 407 = "9999"] (initial value), thermal protection
function by motor thermistor is not activated.
(Electronic thermal relays operate following the current
value set in [Pr.9 Electronic thermal O/L relay].)
When the motor temperature remains at 145°C for 10s, the
inverter protection function (E.THM) activates to shut off
the inverter output.
When the motor temperature goes below -30°C during
operation, the inverter protection function (E.THM)
activates to shut off the inverter output. Motor thermal
(E.THM) does not occur during a stop.
When operation is performed with thermal protection
function valid without a thermistor or in the calibration
status, protection function activates to shut off the inverter
output.
Since a dedicated motor with thermistor has no thermal
protector, always set a value other than "9999" in [Pr. 407
Motor temperature detection filter] to make the thermal
protection function valid. When the setting remains "9999",
motor protection is not activated.
[Pr.]
Motor temperature detection
407
filter
408
Motor thermistor selection
Motor temperature detection
C29(925)
calibration (analog input)
●Thermistor calibration method [C29(Pr.925)]
Perform calibration of
(thermistor interface) before starting the motor at
installation. Calibration must be performed at installation.
1) Set the thermistor calibration status switch (SW2)
to the line to place the FR-A7AZ in the calibration
status.
T/A), feeding back the motor
Initial
Name
Value
100%
the inverter and FR-A7AZ
MCCB
Three-phase
AC power
supply
Connection diagram of the motor thermistor
dedicated for vector control with thermistor
* When calibrating the thermistor, change the thermistor
calibration status switch.
Terminal
Symbol
TH1 Thermistor input 1
TH2 Thermistor input 2
Thermistor
SW2 calibration
status switch
Setting
Range
Set the response level to detect motor temperature.
In normal condition, set it around 30s.
0 to 100s
1 If the response level is not satisfactory, decrease
the setting value.
9999 Motor thermistor input invalid
0
SF-V5RU□□□□□T
0
1
SF-V5RU□□□□□A
Calibration value for an inverter and FR-A7AZ
0 to 200%
(thermistor interface).
SW2
52
SPECIFICATIONS
Inverter
MC
U
R/L1
V
S/L2
W
T/L3
FR-A7AZ
TH1
TH2
*
SW2
Layout of terminals in FR-A7AZ
Terminal Name
Input the motor side
thermistor output signal.
When calibrating at
installation, change the
switch to place the inverter
in calibration status.
Description
SW1
SW2
Motor
IM
Thermistor
Twisted pair shielded cable
Description
FR-A7AZ