Motor Overheat Protection (Electronic Thermal O/L Relay) - Mitsubishi Electric 800 Series Instruction Manual (Function

12
(H) Protective Function Parameters
Purpose
To protect the motor from overheating
To set the overheat protection
characteristics for the motor
To extend the life of the cooling fan
To detect an earth (ground) fault at start
To detect a fault on the output side of
the inverter
To initiate an inverter protective
function
To disable the I/O phase loss protective
function
To restart using the retry function when
the protective function is activated
To set the upper and lower limits of the
output frequency
To prevent the motor from
overspeeding under torque control
To avoid overdriving the motor during
speed control
To operate avoiding resonance points
To limit the output current so that the
inverter protective function does not
activate
To limit the torque during speed control Torque limit
To monitor for load faults
To shut off output if the operation panel
disconnects
To shut off output if the operation panel
disconnects
12.1
Motor overheat protection (electronic thermal O/L
relay)
Set the current of the electronic thermal relay function to protect the motor from overheating. Such settings provide the optimum
protective characteristic considering the low cooling capability of the motor during low-speed operation.
276
12. (H) Protective Function Parameters

12.1 Motor overheat protection (electronic thermal O/L relay)

Parameter to set
Electronic thermal O/L relay
Free thermal O/L relay
Cooling fan operation
selection
Earth (ground) fault detection
at start
Inverter output fault
detection enable/disable
selection
Fault initiation
I/O phase loss
Retry operation
Maximum/minimum
frequency
Speed limit
Overdriving prevention
Frequency jump
Stall prevention
Load characteristics fault
detection
Overspeed detection level
Deceleration check
P.H000, P.H006, Pr.9, Pr.51, Pr.561,
P.H010, P.H016, Pr.607, Pr.608,
P.H020, P.H021 Pr.1016
P.H001 to P.H005, Pr.600 to Pr.604,
P.H011 to P.H015 Pr.692 to Pr.696
P.H100 Pr.244
P.H101 Pr.249
P.H182 Pr.631
P.H103 Pr.997
P.H200, P.H201 Pr.251, Pr.872
P.H300 to P.H303 Pr.65, Pr.67 to Pr.69
P.H400 to P.H402 Pr.1, Pr.2, Pr.18
P.H410 to P.H412 Pr.807 to Pr.809
Pr.285, Pr.853,
P.H415 to P.H417
Pr.873
P.H420 to P.H425, Pr.31 to Pr.36,
P.H429 Pr.552
P.H500, P.H501,
Pr.22, Pr.23, Pr.48,
P.H600, P.H610,
Pr.66, Pr.154,
P.H611, P.H630,
Pr.156, Pr.157,
P.H631, P.M430,
Pr.277, Pr.858
P.T040
P.H500, P.H700 to
Pr.22, Pr.801,
P.H704, P.H710,
Pr.803, Pr.810,
P.H720, P.H721,
Pr.812 to Pr.817,
P.H730, P.T040,
Pr.858, Pr.874
P.G210
P.H520 to P.H527,
Pr.1480 to Pr.1492
P.H531 to P.H535
P.H800 Pr.374
P.H880 Pr.690
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