Mitsubishi Electric FR-E800, Инструкция по эксплуатации

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11. (H) Protective Function Parameters
11.1 Motor overheat protection (electronic thermal O/L relay)
• While the RT signal is ON, the setting values of Pr.51 is referred to provide thermal protection. (While the RT signal is ON,
the setting values of Pr.9 is referred to provide thermal protection under PM sensorless vector control.)
NOTE
• The RT signal is the Second function selection signal. The RT signal also enables other second functions. (Refer to page 334 .)
• For the RT signal, set "3" in any parameter from Pr.178 to Pr.189 (Input terminal function selection) to assign the function.

Motor permissible load level (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.
*1 Depending on the settings of Pr.607 and Pr.608 , this thermal protection may not be provided as set, as an inverter overload trip (electronic thermal
relay function) (E.THT) may be activated before the thermal protection.
 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.
Pr.450
Second applied
motor
Pr.9
Electronic thermal
O/L relay
Pr.51
Second electronic thermal
O/L relay
RT signal OFF RT signal ON
First motor
Second
monitor
First motor
Second
monitor
9999 0
9999 × × × ×
0 × × × ×
0.01 to 500 (0.1 to 3600) × Δ × ○
9999 Other than 0
9999 ○ × ○ ×
0 ○ × Δ ×
0.01 to 500 (0.1 to 3600) ○ Δ Δ ○
Other than 9999 0
9999 × × × ×
0 × × × ×
0.01 to 500 (0.1 to 3600) × Δ × ○
Other than 9999 Other than 0
9999 ○ Δ Δ ○
0 ○ × Δ ×
0.01 to 500 (0.1 to 3600) ○ Δ Δ ○
○ : Values are accumulated by using the output current.
Δ : Values are accumulated by assuming the output
current is 0 A (cooling processing).
×: Electronic thermal O/L relay does not operate.
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 *1
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")