Mitsubishi Electric FR-E720-0.1KNC Instruction Manual page 146

(2) Set two different electronic thermal O/L relays (Pr. 51)
Use this function when running two motors of different rated currents individually by a single inverter. (When running two
motors together, use external thermal relays.)
Set the rated current of the second motor to Pr. 51.
When the RT signal is ON, thermal protection is provided based on the Pr. 51 setting.
To input the RT signal to a virtual terminal of CC-Link communication, set "3" in one of Pr. 180 to Pr. 184 (input terminal
function selection) to assign the function to the terminal.
MC
MC
U
V
W
RT
SD
REMARKS
The RT signal acts as the second function selection signal and makes the other second functions valid. (Refer to page 165)
(3) Electronic thermal relay function prealarm (TH) and alarm signal (THP signal)
100%: Electronic thermal O/L relay alarm operation value
Electronic thermal
relay function
operation level
Electronic thermal
O/L relay alarm
(THP)
NOTE
Changing the assignment of the terminal Y0 or a virtual terminal of CC-Link communication with one of Pr. 190 to Pr.
192, and Pr. 313 to Pr. 315 (output terminal function selection) may affect other functions. Set parameters after confirming
the function of the terminal Y0 and virtual terminals.
Parameters referred to
Pr. 71 Applied motor
Pr. 72 PWM frequency selection
Pr. 180 to Pr. 184 (input terminal function selection)
Pr. 190 to Pr. 192, Pr. 313 to Pr. 315 (output terminal function selection)
Pr. 450
Second applied Electronic
IM
motor thermal O/L relay
9999
IM
9999 Other than 0
Other than 9999
Other than 9999 Other than 0
... Output current value is used to perform integration processing.
Δ... Output current is assumed as 0A to perform integration processing. (cooling processing)
×... Electronic thermal relay function is not activated.
100%
85%
OFF ON
ON
Refer to page 144
Refer to page 192
Refer to page 163
Selection and protection of a motor
Pr. 9 Pr.51
Second electronic
thermal O/L relay
9999
0 0
0.01 to 500
9999
0
0.01 to 500
9999
0 0
0.01 to 500
9999
0
0.01 to 500
The alarm signal (THP) is output and electronic thermal
relay function prealarm (TH) is displayed when the
electronic thermal O/L relay cumulative value reaches
85% of the level set in Pr. 9 or Pr. 51. If it reaches 100%
of the Pr. 9 Electronic thermal O/L relay setting, a motor
overload trip (E.THM/E.THT) occurs.
The inverter does not trip even when the alarm signal
(THP) is output.
To assign the THP signal to the terminal Y0 or a virtual
Time terminal of CC-Link communication, set "8 (positive
logic) or 108 (negative logic)" in one of Pr.190 to Pr.192
and Pr.313 to Pr.315 (output terminal function selection).
Refer to page 167
RT = OFF RT = ON
First Second First Second
motor motor motor motor
× × × ×
× × × ×
× Δ ×
× ×
× Δ ×
Δ Δ
× × × ×
× × × ×
× Δ ×
Δ Δ
× Δ ×
Δ Δ
143
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