Mitsubishi Electric FR-A800 Series Instruction Manual page 421

• For the terminal used for the THP signal output, assign the function by setting "8 (positive logic) or 108 (negative logic)" in
any of Pr.190 to Pr.196 (Output terminal function selection).
Electronic thermal
relay function
operation level
Electronic thermal O/L
relay alarm (THP)
NOTE
• Changing the terminal assignment using Pr.190 to Pr.196 (Output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
 External thermal relay input (OH signal, E.OHT)
Thermal relay protector
Inverter
U
V
W
OH
SD
External thermal relay input connection diagram
• The External thermal relay input (OH) signal is used when using the external thermal relay or the thermal protector built
into the motor to protect the motor from overheating.
• When the thermal relay is activated, the inverter output is shut off by the external thermal relay (E.OHT).
• 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.
• Vector-control-dedicated motors (SF-V5RU) are equipped with thermal protectors.
Inverter
PC
2W1kΩ
OH
SD
Connecting the SF-V5RU thermal protector
*1 Connect the recommended 2 W 1 kΩ resistor between terminals PC and OH. (Refer to
• When the control terminal option (FR-A8TP) is used, valid/invalid setting of the terminal OH can be changed using Pr.876
thermal protector input.
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.
420
5. PARAMETERS
5.10 (H) Protective function parameter
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OFF ON
ON
Motor
M
SF-V5RU
∗1
G1
G2
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