Mitsubishi Electric 800 Series Instruction Manual page 233

 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.
• When the RT signal is ON, thermal protection is provided based on the Pr.51 setting.
Pr.450
Second applied
motor
9999
9999
Other than 9999
Other than 9999
: Values are accumulated by using the output current.
∆: Values are accumulated by assuming the output current is "0 A" (cooling processing).
: Electronic thermal O/L relay does not operate.
NOTE
• The RT signal is a second function selection signal. The RT signal also enables other second functions. (Refer to
348.)
• The RT signal is assigned to the terminal RT in the initial setting. Set "3" in any of Pr.178 to Pr.189 (Input terminal
function selection), to assign the RT signal to another terminal.
232
5. PARAMETERS
5.7 (H) Protective function parameter
M
M
Pr.9
Electronic thermal Second electronic
O/L relay thermal O/L relay
0 9999
0
0.01 to 500 (0.1 to 3600)
Other than 0 9999
0
0.01 to 500 (0.1 to 3600)
0 9999
0
0.01 to 500 (0.1 to 3600)
Other than 0 9999
0
0.01 to 500 (0.1 to 3600)
Pr.51 RT-OFF
No.1 No.2
Motor Motor
 
 

∆




 ∆
 
 

∆

∆
 

∆
RT-ON
No.1 No.2
motor motor
 
 





∆
∆ 
 
 
 

∆

∆

∆
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