Mitsubishi Electric 800 Series, Инструкция по эксплуатации, Страница: 320 / 727

(H) Protective function parameter
PARAMETERS
319
5
GROUP
H
 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 419 .)
• 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.
 Motor permissible load level setting (Pr.607, Pr.608)
The electronic thermal O/L relay operation characteristic can be changed by setting the permissible load level according to the
motor characteristics.
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
0
60
120
180
240
80 100 120 140 160 180 200
Thermal relay operation time (s)
Inverter output power (%)
(% to the inverter rated current)
Range for
the transistor
protection
Motor permissible
load 150% (Initial value)
Motor permissible
load 200%
Motor permissible
load 110%
Example of motor permissible load setting
(when Pr.9="100% of the inverter rating")