Mitsubishi Electric FR-F820-04750 Instruction Manual page 313

Parameters
External thermal relay input (OH signal, E.OHT)
External thermal relay input connection diagram
● The external thermal relay input (OH) signal is used when using an external thermal relay or a
thermal protector built into the motor to protect the motor from overheating.
● When the thermal relay function is activated, the external thermal operation (E.OHT) shuts off the
inverter output.
● For the terminal used for the OH signal input, set "7" in any of Pr. 178 to Pr. 189 (input terminal
function selection) to assign the function.
NOTE Changing the terminal assignment using Pr. 178 to Pr. 189 (input terminal function selection) may
affect the other functions. Set parameters after confirming the function of each terminal.
FR-F800
Thermal relay protector
Inverter
Motor
U
V
M
W
OH
SD
(H) Protective function parameter
Fig. 5-50:
Connection of an external thermal relay
I002582E
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