Mitsubishi Electric FATEC FR-A800 Manual page 132

7
REVIEW OF INSTALLATION ENVIRONMENT
(3) Connection of the control circuit
The following table lists the formats of the I/O terminals in the inverter and common terminals.
Terminal
Contact (or open collector)
Input
terminal
Analog
Contact
Open collector
Output
terminal
Pulse train
Analog
(a) Connection to input terminals
1) Contact or open collector input terminal (insulated from the inverter internal circuit)
Each terminal functions by short-circuiting with the common terminal SD. Since the
power distribution current is the micro-current (4 to 6 mADC), use the micro-current (such
as twin contacts) for switches or relays to prevent a contact faults.
Pay attention to contact faults!
(STF)
Micro-current
SD (common)
2) Analog input terminal (It is not
insulated from the inverter internal
circuit.)
Separate the cables from the high-
voltage circuit cables of 200 V (400 V)
not to band them together.
Always use the shielded cable as a
countermeasure against the external
noise.
Format
Start signal (STF, STR)
Selection signal (RH, RM, RL, AU, etc)
Frequency setting signal
(such as 2, 1, and 4)
Fault output (A, B)
Running signal
(RUN, SU, OL, IPF, FU)
For an indicator (frequency meter) (FM)
For analog voltage output (AM)
Programmable
controller, etc.
RA
(STF)
SD
Contact input (relay)
Fig. 7.36 Connection of input signals
7.3 Problems and measures when using inverter
Example of terminal
Programmable controller, etc.
(Transistor output)
(STF)
SD
Open collector
Induction noise
Power
supply
Do not band
them together.
Exogenous noise
Fig. 7.37 Connection example of the frequency
setting input terminal
Common terminal
SD or PC (power
supply common)
＋
5
C
SE
SD
5
STF
PC
DC
24V
Open collector
(External power supply)
R
S
T
10
2
5
Shielded cable
127
1
2
3
4
5
6
7
8