Mitsubishi FR-A800

(H) Protective function parameter
PARAMETERS
335
5
GROUP
H
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.
Electronic thermal O/L relay pre-alarm (TH) and warning signal (THP
signal)
• If the accumulated electronic thermal value reaches 85% of the Pr.9 or Pr.51 setting, electronic thermal O/L relay function
pre-alarm (TH) is displayed and the electronic thermal O/L relay pre-alarm (THP) signal is output. If the value reaches
100% of the Pr.9 setting, the motor thermal protection (E.THM/E.THT) is activated to shut off the inverter output. The
inverter output is not shut off with the TH display. The inverter output is not shut off with the warning signal (THP).
• For the terminal used for THP signal output, set "8 (positive logic)" or "108 (negative logic)" in any of Pr.190 to Pr.196
(output terminal function selection) to assign the function.
• 100%: Electronic thermal O/L relay activation value
NOTE
• Changing the terminal assignment using Pr.190 to Pr.196 (output terminal function selection) may affect the other
functions. Set parameters after confirming the function of each terminal.
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")
OFF
ON
100%
85%
Time
ON
Electronic thermal
relay function
operation level
Electronic thermal O/L
relay alarm
(THP)