Mitsubishi Electric 800 Series Instruction Manual page 236

• When the PTC thermistor protection level setting is used, use Pr.1016 PTC thermistor protection detection time to set
the time from when the resistance of the PTC thermistor reaches the protection level until the protective function (E.PTC)
is activated. If the resistance of the PTC thermistor falls below the protection level within the protection detection time, the
elapsed time count is cleared.
PTC thermistor resistance
Pr.561
setting
ALM
NOTE
• When using terminal 2 for PTC thermistor input (Pr.561 ≠ "9999"), the terminal 2 will not operate as an analog frequency
command terminal. The PID and dancer control functions assigned to the terminal 2 will be also disabled. Use Pr.133 PID
action set point to set the set point for the PID function.
• To input power to the PTC thermistor power supply, always use the terminal 10. Do not use any other terminals or an
external power supply. Otherwise, the PTC thermistor protection (E.PTC) does not operate properly.
• When E.PTC is activated, the alarm display, "External protection (AU terminal)", may appear on the parameter unit (FR-
PU07), but it is not a fault.
The elapsed time count is cleared.
Pr.1016
Time
E.PTC
5.7 (H) Protective function parameter
3
4
5
5
5
6
7
8
9
10
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5. PARAMETERS