Mitsubishi FR-A800-E - Page 36

Control circuit
INSTALLATION AND WIRING
35
2
 Set Pr.73, Pr.267, and the voltage/current input switch correctly, then input an analog signal in accordance with the setting.
Applying a voltage with the voltage/current input switch ON (current input is selected) or a current with the switch OFF (voltage input is selected)
could cause component damage of the inverter or analog circuits of output devices. (For the details, refer to the FR-A800 Instruction Manual
(Detailed).)
 Sink logic is initially set for the FM-type inverter.
 Source logic is initially set for the CA-type inverter.
Frequency setting
10E
Frequency setting
power supply
When connecting the frequency setting potentiometer at an initial
status, connect it to terminal 10.
Change the input specifications of terminal 2 using Pr.73 when
connecting it to terminal 10E.
10 VDC 0.4 V
Permissible load current
10 mA
10
5 VDC 0.5 V
Permissible load current
10 mA
2
Frequency setting
(voltage)
Inputting 0 to 5 VDC (or 0 to 10 V, 0 to 20 mA) provides the
maximum output frequency at 5 V (10 V, 20 mA) and makes input
and output proportional. Use Pr.73 to switch among input 0 to 5
VDC (initial setting), 0 to 10 VDC, and 0 to 20 mA. Set the voltage/
current input switch in the ON position to select current input (0 to
20 mA).

When voltage is input:
Input resistance 10 k1
k
Maximum permissible
voltage 20 VDC
When current is input:
Input resistance 245  5

Permissible maximum
current 30 mA
4
Frequency setting
(current)
Inputting 4 to 20 mADC (or 0 to 5 V, 0 to 10 V) provides the
maximum output frequency at 20 mA and makes input and output
proportional. This input signal is valid only when the AU signal is
ON (terminal 2 input is invalid). Use Pr.267 to switch among input 4
to 20 mA (initial setting), 0 to 5 VDC, and 0 to 10 VDC. Set the
voltage/current input switch in the OFF position to select voltage
input (0 to 5 V/0 to 10 V).

Use Pr.858 to switch terminal functions.
1
Frequency setting
auxiliary
Inputting 0 to ±5 VDC or 0 to ±10 VDC adds this signal to terminal
2 or 4 frequency setting signal. Use Pr.73 to switch between input 0
to ±5 VDC and 0 to ±10 VDC (initial setting). Use Pr.868 to switch
terminal functions.
Input resistance 10 k 1
k
Permissible maximum
voltage 20 VDC
5
Frequency setting
common
Common terminal for frequency setting signal (terminal 2, 1 or 4)
and analog output terminal AM, CA. Do not earth (ground).
—
Thermistor
10
2
PTC thermistor input
For receiving PTC thermistor outputs.
When PTC thermistor is valid (Pr.561  "9999"), terminal 2 is not
available for frequency setting.
Applicable PTC
thermistor specification
Overheat detection
resistance:
0.5 to 30 k
(Set by Pr.561)
External Power
supply input
+24
24 V external power
supply input
For connecting a 24 V external power supply.
If a 24 V external power supply is connected, power is supplied to
the control circuit while the main power circuit is OFF.
(Refer to page 43.)
Input voltage 23 to 25.5
VDC
Input current 1.4 A or less
Type
Terminal
symbol
Terminal name Terminal function description Rated specification
Voltage/current
input switch
2 4
switch1
switch2