Mitsubishi Electric FR-A872-E Instruction Manual page 46

 Input signal
Terminal
Type Terminal name
symbol
*1
Reset
RES
External thermal relay
*1
OH
input
*1
Contact input
RDI
Contact input
common (sink)
External transistor
SD common (source)
24 VDC power supply
common
External transistor
common (sink)
PC
Contact input
common (source)
24 VDC power supply Can be used as a 24 VDC 0.1 A power supply.
24 V external power
+24
supply input
*1 Terminal functions can be selected using Pr.178, Pr.187, or Pr.189 (Output terminal function selection).
 Output signal
Terminal
Type Terminal name
symbol
A1,
Relay output 1 (fault
B1,
output)
*1
C1
88R,
For manufacturer setting. Do not use.
88S
Inverter operation
*1
RDA
enable (NO contact)
Inverter operation
*1
RDB
enable (NC contact)
*1
Inverter reset
RSO
Instantaneous power
*1
IPF
failure
*1
Cooling fan fault
FAN
Open collector output
SE
common
*1 Terminal functions can be selected using Pr.190 to Pr.195 (Output terminal function selection).
Terminal function description
Use this signal to reset a fault output provided when a protective function
is activated. Turn ON the RES signal for 0.1 second or longer, then turn it
OFF.
In the initial setting, reset is always enabled. Setting Pr.75 makes reset
possible only after the occurrence of a converter unit fault. The converter
will restart about 1 second after reset.
The External thermal relay input (OH) signal is used when using the
external thermal relay or the thermal protector built into the motor to
protect the motor from overheating.
When the thermal relay is activated, the inverter output is shut off by the
external thermal relay operation (E.OHT).
Use Pr.178 to assign a function to the terminal.
Common terminal for the contact input terminal (sink logic) and terminal
FM.
Connect this terminal to the power supply common terminal of a transistor
output (open collector output) device, such as a programmable controller,
in the source logic to avoid malfunction by undesirable current.
Common terminal for the 24 VDC power supply (terminal PC, terminal
+24).
Isolated from terminals 5 and SE.
Connect this terminal to the power supply common terminal of a transistor
output (open collector output) device, such as a programmable controller,
in the sink logic to avoid malfunction by undesirable current.
Common terminal for contact input terminal (source logic).
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.
Terminal function description
1 changeover contact output that indicates that the protective function of
the converter unit has been activated and the outputs are stopped.
Fault: discontinuity across B and C (continuity across A and C), Normal:
continuity across B and C (discontinuity across A and C)
Switched to LOW when the converter unit operation is ready.
Assign the signal to the terminal MRS (X10) of the inverter.
The inverter can be started when the RDA status is LOW.
Switched to LOW when a converter unit fault occurs or the converter is
reset.
The inverter can be started when the RDB status is HIGH.
Switched to LOW when the converter is reset (RES-ON).
Assign the signal to the terminal RES of the inverter.
The inverter is reset when it is connected with the RSO status LOW.
Switched to LOW when an instantaneous power failure is detected.
Switched to LOW when a cooling fan fault occurs.
Common terminal for terminals RDA, RDB, RSO, IPF, FAN
Connect this terminal to the terminal SD (sink logic) or PC (source logic)
of the inverter.
Rated specification
Input resistance: 4.7
kΩ,
voltage when contacts
are open: 21 to 27
VDC,
current when contacts
are short-circuited: 4
to 6 mADC
—
Power supply voltage
range: 19.2 to 28.8
VDC, permissible load
current: 100 mA
Input voltage: 23 to
25.5 VDC, input
current: 1.4 A or less
Rated specification
Contact capacity: 230
VAC 0.3 A
(power factor = 0.4),
30 VDC 0.3 A
Permissible load: 24
VDC (27 VDC at
maximum) 0.1 A
(The voltage drop is
2.8 V at maximum
while the signal is ON.)
The open collector
transistor is ON
(conductive) in LOW
state.
The transistor is OFF
(not conductive) in
HIGH state.
—
2. INSTALLATION AND WIRING
2.6 Control circuit
1
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