Mitsubishi Electric FR-F820-00077 Instruction Manual page 434

(T) Multi-Function Input Terminal Parameters
(–10 V)
STF signal
STF signal
Fig. 5-119:
NOTE After changing the Pr. 73 setting, check the voltage/current input switch setting. Incorrect setting
may cause a fault, failure or malfunction. (For the settings, refer to page 5-255.)
Override function (Pr. 252, Pr. 253)
● Use the override function to make the main speed changed at a specified rate.
● Set Pr. 73 = "4, 5, 14, or 15" to select the override function.
● When the override function is selected, terminal 1 or 4 is used for the main speed setting, and
terminal 2 is used for the override signal. (if the main speed is not input to the terminal 1 or 4, the
compensation by terminal 2 is disabled.)
● Specify the scope of override by using Pr. 252 and Pr. 253.
● How to calculate the set frequency for override:
– Set frequency (Hz) = Main speed setting frequency [Hz] × (Compensation [%]/100 [%])
– Main speed setting frequency (Hz): Terminals 1 or 4 input, multi-speed setting
5 - 262
Output frequency
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
–5 V –2.5 V 0 +2.5 V +5 V
(–5 V) (+5 V) (+10 V)
Forward rotation
ON
Forward rotation
ON
(a) When Pr. 73 setting is 0 to 5
Auxiliary input characteristics
Forward
Inverter
rotation
STF
PC
10
Override
2
setting
5
Main
1
(+)
speed
(-)
When voltage
across terminals
2 and 5 is 0 V
Terminal 1 –5 V
(–10 V)
Reverse rotation
STF signal
ON
Reverse rotation
STF signal
ON
(b) When Pr. 73 setting is 10 to 15
Fig. 5-120:
Connection example for the override function
Parameters
Output frequency
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
When voltage
across terminals
2 and 5 is 0 V
–2.5 V 0 +2.5 V +5 V
(–5 V) (+5 V) (+10 V)
Forward rotation
Forward rotation
Terminal 1
I001187E
I002645E_G