Mitsubishi Electric 800 Series Instruction Manual page 201

• Operational characteristic of the electronic thermal relay function
70
60
50
240
180
120
60
0
80 100 120 140 160 200 220 240 260 280 300
Protective function activated area: the area right of the characteristic curve
Normal operation area: the area left of the characteristic curve
*1 The % value denotes the percentage to the rated motor current.
NOTE
• The internal accumulated heat value of the electronic thermal relay function is reset to the initial value by the inverter's power
reset or reset signal input. Avoid unnecessary reset and power-OFF.
• The transistor protection thermal O/L relay is activated early when the Pr.72 PWM frequency selection setting is increased.
 Set two types of electronic thermal O/L relays (Pr.51)
MC
MC
U
V
W
RT
SD
• These settings are used when rotating two motors with different rated current separately by a single inverter. (When
rotating two motors together, use an external thermal relay.)
• Set the rated motor current for the second motor in Pr.51 Second electronic thermal O/L relay.
200
10. (H) Protective Function Parameters
10.1 Motor overheat protection (electronic thermal O/L relay)
2000r/min
(133.33Hz) or lower
3000r/min
(200Hz)
2000r/min
(133.33Hz) or lower
3000r/min
(200Hz)
Range for the
transistor
protection
Current [%]
M
M