Motor Permissible Load Level Setting (Pr.607, Pr.608); Electronic Thermal O/L Relay Pre-Alarm (Th) And Warning Signal (Thp Signal) - Mitsubishi Electric FR-F800 Instruction Manual

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.
Motor permissible
load 110%
240
180
120
60
0
80 100 120
Inverter output power (%)
(% to the inverter rated current)
Example of motor permissible load setting
(when Pr.9="100% of the inverter rating")
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.
Electronic thermal
relay function
operation level
Electronic thermal O/L
(THP)
relay alarm
OFF
• 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.
Motor permissible
load 150% (Initial value)
Range for
the transistor
protection
140 160 180 200
100%
85%
ON
ON
Time
(H) Protective function parameter
PARAMETERS
5
GROUP
H
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