Mitsubishi FR-A800

(H) Protective function parameter
334
PARAMETERS
Set two types of electronic thermal O/L relays (Pr.51)
• 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.
NOTE
• The RT signal is a second function selection signal. The RT signal also enables other second functions. (Refer to page 434.)
• 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.
Pr.450
Second applied
motor
Pr.9
Electronic
thermal O/L relay
Pr.51
Second electronic
thermal O/L relay
RT-OFF RT-ON
No.1
Motor
No.2
Motor
No.1
motor
No.2
motor
9999 0
9999 
0 
0.01 to 500 (0.1 to 3600)    
9999 Other than 0
9999    
0    
0.01 to 500 (0.1 to 3600)  
Other than 9999 0
9999 
0 
0.01 to 500 (0.1 to 3600)    
Other than 9999 Other than 0
9999  
0    
0.01 to 500 (0.1 to 3600)  
: 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.
RT
SD
MC
MC
W
V
U
IM
IM