(H) Protective function parameter
Parameters
5 - 304
Electronic thermal O/L relay operation characteristic for induction motor (Pr. 9, E.THM)
●
This function detects the overload (overheat) of the motor and trips the inverter by stopping the
operation of the transistor at the inverter output side.
●
Set the rated current (A) of the motor in Pr. 9. (If the motor has both 50 Hz and 60 Hz ratings and
the Pr. 3 "Base frequency" is set to 60 Hz, set to 1.1 times the 60 Hz rated motor current.)
●
Set "0" in Pr. 9 to avoid activating the electronic thermal O/L relay function; for example, when
using an external thermal relay for the motor. (Note that the output transistor protection of the
inverter is activated. (E.THT))
●
When using the Mitsubishi constant-torque motor, set Pr. 71 "Applied motor" = "1, 13 to 16, 50,
53, 54". (This will set a 100% continuous torque characteristic in the low-speed range.)
When setting Pr. 9 to a value (current value) of 50% of the inverter rated current
The % value denotes the percentage to the inverter rated current. It is not the percentage to the
rated motor current.
When the electronic thermal O/L relay of the Mitsubishi constant-torque motor is set, the charac-
teristic curve is as shown in this diagram at 6 Hz or higher. (For selection of the operation
characteristic, refer to page 5-451.)
Transistor protection is activated depending on the temperature of the heatsink. The protection
may be activated even with less than 150% depending on the operating conditions.
I002579E
Fig. 5-121:
Electronic thermal relay function operation characteristic
52.5%
105%
50
100
150
230
60
120
180
240
50
60
70
Pr. 9 = 50 % setting of
inverter rating
(mi
n
) unit displa
y
in
thi
s r
e
g
io
n
Pr. 9 = 100 % setting of
inverter rating
(s) unit displa
y
in this
re
gion
Oper
a
tion time (s)
Operation time
(min)
30 Hz
or more
20 Hz
10 Hz
6 Hz
0.5 Hz
30 Hz or more
20 Hz
10 Hz
6 Hz
0.5 Hz
Operation region
Region on the right of
characteristic curve
Non-operation region
Region on the left of character-
istic curve
Characteristic when
electronic thermal relay
function for motor
protection is turned off
(When Pr. 9 setting is 0 (A))
Range for
the transistor
protection
Inverter output power (%)
(% to the inverter rated current)
Summary of Contents for FR-A820-00046 (0.4K)
Page 2: ......
Page 4: ......
Page 144: ...System configuration for Ethernet communication FR A800 E Installation and wiring 2 114 ...
Page 202: ...Basic operation procedure JOG operation Basic operation 4 32 ...
Page 1090: ...Check first when you have a trouble Protective functions 6 50 ...
Page 1189: ...Appendix EC Declarations of Conformity FR A800 A 49 ...
Page 1190: ...EC Declarations of Conformity Appendix A 50 ...
Page 1191: ...Appendix EC Declarations of Conformity FR A800 A 51 ...
Page 1192: ...EC Declarations of Conformity Appendix A 52 ...
Page 1193: ...Appendix EC Declarations of Conformity FR A800 A 53 ...
Page 1194: ...EC Declarations of Conformity Appendix A 54 ...
Page 1195: ...Appendix EC Declarations of Conformity FR A800 A 55 ...
Page 1196: ...EC Declarations of Conformity Appendix A 56 ...
Page 1197: ...Appendix EC Declarations of Conformity FR A800 A 57 ...
Page 1198: ...EC Declarations of Conformity Appendix A 58 ...
Page 1199: ...Appendix EC Declarations of Conformity FR A800 A 59 ...
Page 1200: ...EC Declarations of Conformity Appendix A 60 ...
Page 1201: ...Appendix EC Declarations of Conformity FR A800 A 61 ...
Page 1202: ...EC Declarations of Conformity Appendix A 62 ...
Page 1203: ...Appendix EC Declarations of Conformity FR A800 A 63 ...
Page 1204: ...EC Declarations of Conformity Appendix A 64 ...
Page 1205: ...Appendix EC Declarations of Conformity FR A800 A 65 ...
Page 1206: ...EC Declarations of Conformity Appendix A 66 ...
Page 1207: ...Appendix EC Declarations of Conformity FR A800 A 67 ...
Page 1208: ...EC Declarations of Conformity Appendix A 68 ...
Page 1209: ...Appendix EC Declarations of Conformity FR A800 A 69 ...
Page 1210: ...EC Declarations of Conformity Appendix A 70 ...
Page 1211: ...Appendix EC Declarations of Conformity FR A800 A 71 ...
Page 1212: ...EC Declarations of Conformity Appendix A 72 A 7 2 FR A846 series ...
Page 1213: ...Appendix EC Declarations of Conformity FR A800 A 73 ...
Page 1214: ...EC Declarations of Conformity Appendix A 74 ...
Page 1215: ...Appendix EC Declarations of Conformity FR A800 A 75 ...
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