Mitsubishi Electric FR-A700 Series, Technical Manual

Page: 57 / 550

50
SPECIFICATIONS
1.4.9 External thermal relay input (OH)
(common
)
To protect the motor against overheat, use the OH signal
when using an external thermal relay or the built-in thermal
protector of the motor.
When the thermal relay operates, the inverter trips and
outputs the fault signal (E.OHT).
For the terminal used for OH signal input, assign the
function by setting 7 in any of [
Pr. 178 to Pr. 189 Input
terminal function selection ].
A thermal protector is provided for a vector control
dedicated motor (SF-V5RU).
When using the motor dedicated for vector control (SF-
V5RU) in
, assign OH (external thermal input) signal
to the CS terminal. [ Pr. 186 = 7 ]
Connect a 2W1k resistor between the terminal PC and
CS (OH).
Install the resistor pushing it against the bottom part of the
terminal block so as to avoid a contact with other cables.
Refer to page 37 for details of [
Pr. 186 CS terminal function
selection ].
1.4.10 Thermistor input (PTC)
(A700, F700)
(10, 2)
(D700)
(TH1*, TH2*)
(A700)
(1) When using PTC signal ( )
Built-in PTC thermistor output of the motor can be input to
the PTC signal (terminal AU).
For the terminal used for PTC signal input, assign the
function by setting 63 in [
Pr.184 AU terminal function
selection
] and also set the AU/PTC switchover switch to the
PTC terminal function.
When the overheat status of the motor is detected for 10s
or more by the PTC thermistor input, output from the
inverter is shut off and PTC thermal alarm signal (E.PTC) is
output.
The input specifications of the PTC thermistor are shown
below.
*1 When the PTC signal was not assigned to [
Pr. 184
] and
the AU/PTC switchover switch was set to the PTC
terminal function, the function assigned to the AU
terminal is always OFF. Reversely, when the PTC signal
was assigned to [
Pr. 184
] and the AU/PTC switchover
switch was set to the AU terminal function, a PTC
thermal error (E.PTC) occurs since the function is always
in a motor overheat state.
*2 When you want to input a current, assign the AU signal to
the other signal.
common
Inverter
U
V
W
OH
Thermal relay protector
Motor
IM
SD
External thermal relay input
connection example
A700
G1
G2
CS(OH)
SD
PC
Inverter SF-V5RU
Connection of the thermal relay
protector of the SF-V5RU
CS(OH)
PC
Control circuit
terminal block
Resistor
A700 F700 D700 A700
(*Terminal TH1, TH2 are available only in the with FR-A7AZ.)
A700
Motor Temperature
PTC Thermistor Resistance
(
Ω
)
Normal 0 to 500
Boundary 500 to 4k
Overheat 4k or higher
A700 F700
Inverter
U
AU
PTC
V
W
AU(PTC)
SD
Motor
PTC thermistor input
connection example
AU/PTC switchover switch
Factory-set to "AU".
Set to the "PTC" position to
validate the PTC signal input.
Inverter
AU
PTC