Control Terminals - Mitsubishi Electric FR-A800 Series Beginner's Manual

Control terminals

3.2 Control terminals
In addition to the power terminals for the mains power supply and the motor there are also a large
number of additional terminals that are used for controlling the frequency inverter. The table below
only lists the most important control terminals – for complete details refer to the Instruction Manual
of your inverter.
Type
3 - 4
Terminal Function
STF Start forward
STR Start reverse
STP (STOP) Start self-holding selection
RH, RM, RL Speed selection
Jog mode selection /
JOG
Pulse train input
RT Second function selection
MRS Output stop
RES RESET input
AU Terminal 4 input selection
Automatic restart after
CS
instantaneous power failure
SD Common terminal for control inputs using sink logic
PC 24V DC output and common terminal for control inputs using source logic
Power supply for frequency
10
setting potentiometer
Input for frequency setting
2 voltage signal
(0 to 5 V or 0 to 10 V DC)
Common terminal for
5
frequency setting signal
Input for frequency setting
4
current signal (4 to 20 mA DC)
1 Frequency setting auxiliary
Description
Applying a signal to terminal
STF starts the motor with
forward rotation (clockwise).
Applying a signal to terminal
STR starts the motor with
reverse rotation
(counterclockwise).
Turn ON the STOP signal to self-hold the start signal.
Up to 15 different speeds (output frequencies) can be selected
by combining these signals (see also section 6.2.4)
Turn ON the JOG signal to enable JOG operation (initial setting)
and turn ON the start signal (STF or STR) to start JOG operation.
Terminal JOG is also used as a pulse train input terminal.
Turn ON the RT signal to enable the second function.
Applying a signal to this input for more than 20 ms switches off
the inverter output without delay.
For separated converter types connect this terminal to terminal
RDA of the converter unit FR-CC2. When RDA signal turns off,
inverter output shuts off.
Used to reset the inverter and clear the alarm state after a pro-
tective function has been triggered (see section 7.3). A signal
must be applied to RES for at least 0.1 s to execute a reset.
The terminal 4 function is available only when the AU signal is
turned ON. Turning the AU signal ON makes terminal 2 invalid.
When the CS signal is left ON, the inverter restarts automatically
at power restoration. Note that restart setting is necessary for
this operation. In the initial setting, a restart is disabled.
Output 5V DC, max current 10 mA.
Recommended potentiometer: 1 kΩ, 2 W linear, (multi-
potentiometer)
A setpoint signal of 0–5 V or 0–10 V is applied to this terminal.
The range is preset to 0–5 V. The input resistance is 10 kΩ; the
maximum permissible voltage is 20 V.
Terminal 5 is the common terminal for the analog setting sig-
nals connected to terminals 2, 1 and 4. Terminal 5 is isolated
and to prevent interference it should not be earthed.
Input for frequency setting current signal (4 to 20 mA DC). If a
current signal (0 to 20 mA or 4 to 20 mA DC) is used as the
frequency setting signal it is connected to this terminal. The
input resistance is 245 Ω, the maximum permissible current is
30mA.
The factory default setting is 0 Hz at 4 mA and 50 Hz at 20 mA.
Note that a signal must be applied to control input AU at the
same time to activate this terminal.
Inputting 0 to ±5 V DC or 0 to ±10 V DC adds this signal to
terminal 2 or 4 frequency setting signal. Use Pr. 73 to switch
between input 0 to ±5 V DC and 0 to ±10 V DC (initial setting).
The input resistance is 10 kΩ, the maximum permissible voltage
is 20 V DC.
Connections
Applying signals to STF and
STR simultaneously stops the
motor.