Mitsubishi Electric FR-A800, Instruction Manual

Page: 101 / 1042

Installation and wiring Connection of motor with encoder (vector control)
FR-A800 2 - 71
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.)
+
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
2
or larger) to connect the FR-A8AP. For the wiring to the
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).
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
2
gauge cables in parallel or a 1.25 mm
2
or larger gauge
cable. The voltage applied must be within power supply specifications of encoder.
Fig. 2-53:
Connection of the resistor
I002806E
Fig. 2-54:
Example of parallel connection with two cables
I002395E
Wiring length Parallel connection Larger-size cable
10 m At least two cables in parallel
Cable gauge 0.2 mm
2
0.4 mm
2
20 m At least four cables in parallel
0.75 mm
2
100 m
At least six cables in parallel
1.25 mm
2
Tab. 2-35: Cable gauges and number of parallel cables
PC
RH (OH)
When OH signal is assigned to terminal RH
(Pr.182 = "7")
Resistor (2 W 1 k
Ω
)
2-wire blade terminal
To thermal protector
Insulate
Insulate
PZ2
PZ1
PA1
PA2
FB1
FB2
SD
PG
G
F
D
C
B
A
R
S
PLG
FR-A800
(FR-A8AP)
Example of parallel connection
with two cables
(with complementary encoder output)
2 mm
2
Encoder