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

10
(H) Protective Function Parameters
Purpose
To protect the motor from overheating
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
10.1
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.
Pr.
9
Electronic thermal O/L relay
H000
51 Second electronic thermal O/L
H010 relay
*1 The initial value for the FR-E820-0050(0.75K) or lower, the FR-E840-0026(0.75K) or lower, and the FR-E860-0017(0.75K) is set to the 85% of
the inverter rated current.
 Electronic thermal O/L relay operation characteristic for induction motor
(Pr.9)
• This function detects the overload (overheat) of the motor and shut off the inverter output by stopping the operation of the
transistor at the inverter output side.
198
10. (H) Protective Function Parameters

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

Electronic 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
Name Initial value
Inverter rated
*1
current
9999
Parameter to set
P.H000, P.H010
P.H100
P.H101
P.H182
P.H103
P.H200, P.H201
P.H300 to P.H303
P.H400 to P.H402
P.H410 to P.H412
P.H416, P.H417
P.H420 to P.H425
P.H500, P.H501,
P.H600, P.H610,
P.H611, P.H630,
P.H631, P.M430,
P.T040
P.H500, P.H700 to
P.H704, P.H710,
P.H720, P.H721,
P.H730, P.T040,
P.G210
P.H520 to P.H527,
P.H531 to P.H535
P.H800
Setting range
0 to 500 A Set the rated motor current.
Enabled when the RT signal is ON.
0 to 500 A
Set the rated motor current.
9999 Second electronic thermal O/L relay invalid
Refer to page
Pr.9, Pr.51 198
Pr.244 203
Pr.249 204
Pr.631 205
Pr.997 206
Pr.251, Pr.872 207
Pr.65, Pr.67 to Pr.69 208
Pr.1, Pr.2, Pr.18 211
Pr.807 to Pr.809 120
Pr.285, Pr.853 109
Pr.31 to Pr.36 212
Pr.22, Pr.23, Pr.48,
Pr.66, Pr.154,
214
Pr.156, Pr.157,
Pr.277, Pr.858
Pr.22, Pr.801,
Pr.803, Pr.810,
100
Pr.812 to Pr.817,
Pr.858, Pr.874
Pr.1480 to Pr.1492 219
Pr.374 224
Description