Mitsubishi Electric FR-F820-00046, Instruction Manual

Page: 434 / 940

(T) Multi-Function Input Terminal Parameters Parameters
5 - 262
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
I001187E
Fig. 5-119: Auxiliary input characteristics
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.)
Fig. 5-120:
Connection example for the override function
I002645E_G
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
Output frequency
Terminal 1 –5 V
(–10 V)
–2.5 V
(–5 V)
+2.5 V
(+5 V)
+5 V
(+10 V)
0
STF signal
ON
Forward rotation
Forward rotation
(a) When Pr. 73 setting is 0 to 5
When voltage
across terminals
2 and 5 is 0 V
When voltage across
terminals 2 and 5 is 2.5 V
(5 V)
Output frequency
Terminal 1 –5 V
(–10 V)
–2.5 V
(–5 V)
+2.5 V
(+5 V)
+5 V
(+10 V)
0
STF signal
ON
Forward rotation
Forward rotation
(b) When Pr. 73 setting is 10 to 15
Reverse rotation
Reverse rotation
When voltage
across terminals
2 and 5 is 0 V
STF signal
ON
STF signal
ON
10
2
5
STF
PC
1
(-)
(+)
Main
speed
Override
setting
Forward
rotation
Inverter