Mitsubishi Electric FR-A820-00046 Instruction Manual page 101

Installation and wiring
To use a terminal as the terminal OH, assign the OH (external thermal O/L relay input) signal to an
input terminal. (Set "7" in any of Pr. 178 to Pr. 189. For details, refer to page 5-422.)
When OH signal is assigned to terminal RH
(Pr.182 = "7")
Resistor (2 W 1 kΩ)
Assign the function using Pr. 178 to Pr. 184, Pr. 187 to Pr. 189 (input terminal function selection).
When position control is selected, terminal JOG function is invalid and simple position pulse train
input terminal becomes valid.
Assign the function using Pr. 190 to Pr. 194 (output terminal function selection).
Instructions for encoder cable wiring
● Use shielded twisted pair cables (0.2 mm
terminals PG and SD, use several cables in parallel or use a thick cable, according to the wiring
length.
To protect the cables from noise, run them away from any source of noise (such as the main circuit
and power supply voltage).
Wiring length
100 m
Tab. 2-35:
When differential line driver is set and a wiring length is 30 m or more.
The wiring length can be extended to 100 m by increasing the 5 V power supply (approximately
to 5.5 V) while using six or more 0.2 mm
cable. The voltage applied must be within power supply specifications of encoder.
FR-A800
RH (OH)
PC
Insulate
Insulate
Example of parallel connection
with two cables
(with complementary encoder output)
FR-A800
(FR-A8AP)
PA1
PA2
FB1
FB2
PZ1
PZ2
PG
SD
2
2 mm
10 m At least two cables in parallel
20 m At least four cables in parallel
At least six cables in parallel
Cable gauges and number of parallel cables
Connection of motor with encoder (vector control)
Fig. 2-53:
Connection of the resistor
2-wire blade terminal
To thermal protector
2
or larger) to connect the FR-A8AP. For the wiring to the
Fig. 2-54:
Example of parallel connection with two cables
Encoder
PLG
A
B
C
D
F
G
S
R
Parallel connection
Cable gauge 0.2 mm
2
gauge cables in parallel or a 1.25 mm
Larger-size cable
2
0.4 mm
2 2
0.75 mm
2
1.25 mm
2
or larger gauge
I002806E
I002395E
2 - 71