H) Protective Function Parameter; Motor Overheat Protection (Electronic Thermal O/L Relay) - Mitsubishi Electric FR-CS82S-025 Instruction Manual

5.6

(H) Protective function parameter

Purpose
To protect the motor from overheating
To detect an earth (ground) fault at start
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 operate avoiding resonance points
To limit the output current so that the
inverter protective function does not
activate
5.6.1 Motor overheat protection (electronic thermal O/L
relay)
Set the current of the electronic thermal O/L 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
 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.
• Set the rated motor current (A) in
Pr.3 Base frequency
• Set "0" in to avoid activating the electronic thermal O/L relay function in cases such as when using an external thermal
Pr.9
relay for the motor.
(Note that the output transistor protection of the inverter is activated. (E.THT))
112
5. PARAMETERS
5.6 (H) Protective function parameter
Electronic thermal O/L relay
Earth (ground) fault detection
at start
I/O phase loss
Retry operation
Maximum/minimum
frequency
Frequency jump
Stall prevention
Name Initial value
Inverter
rated current
Pr.9 Electronic thermal O/L relay
is set to 60 Hz, set to 1.1 times the 60 Hz rated motor current.)
Parameter to set
P.H000
P.H101
P.H200, P.H201
P.H300 to P.H303
P.H400 to P.H402
P.H420 to P.H425
P.H500, P.H501,
P.H610, P.H611,
P.M430
Setting range
0 to 500 A Set the rated motor current.
. (If the motor has both 50 Hz and 60 Hz ratings and the
Refer to page
Pr.9 112
Pr.249 114
Pr.251, Pr.872 115
Pr.65, Pr.67 to Pr.69 115
Pr.1, Pr.2, Pr.18 117
Pr.31 to Pr.36 118
Pr.22, Pr.23, Pr.66,
119
Pr.156, Pr.157
Description