Mitsubishi Electric FR-E 500 Instruction Manual page 116

2) Pr.254 " analog polarity reversible lower limit "
The lower limit of the analog voltage value applied across terminals 2-5 can be set.
(This setting will prevent a reversible operation (rotation) when the analog voltage
applied across terminals 2-5 drops.)
Terminal 2 input voltage is 0V = 0% and 5V (10V) = 100%.
Note: Set "10" or "11" in Pr. 73 and any value in Pr. 254 to make this function valid.
<Output frequency under the following conditions>
" When analog voltage value < Pr. 254 setting (%), output frequency of inverter is 0Hz.
" When Pr. 254 setting (%) ≤ analog
voltage value (%) ≤ Pr. 254 setting
(%) + 5.0%, output frequency is
same as when Pr. 254 setting (%) +
5.0%
Ex.) When setting "10"or "11" in
Pr. 73, 0Hz and 2.5V in
Pr. 902, and 50Hz and 5V in
Pr. 903 to give a forward
rotation command
REMARKS
A reversible operation can not be performed during PID control.
Note: If "801" is set in Pr. 77, be sure to reset it to the original setting.
Do not design the wiring and facility which will make the voltage lower
than the Pr. 902 setting suddenly.
Doing so can cause the inverter to provide reverse rotation output if the
analog signal wiring is disconnected or the speed command analog
signal turns to 0V, resulting in hazardous conditions.
Output frequency[Hz]
Pr. 254+5.0%
Pr. 903
Pr. 254
Pr. 902
0Hz
0V 2.5V
Reverse
(0V) (5V)
rotation
0% 50%
Output frequency[Hz]
WARNING
101
PARAMETERS
Forward
Input voltage
rotation
(Terminal 2)
5V
[V]
(10V)
100%
Use Pr. 73
4