Mitsubishi Electric FR-A800 Instruction Manual page 57

Connection of motor with encoder (vector control)
Instructions for encoder cable wiring
• Use shielded twisted pair cables (0.2 mm
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
Within 10 m At least two cables in parallel
Within 20 m At least four cables in parallel
Within 100 m At least six cables in parallel


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
cables in parallel or a 1.25 mm
• To reduce noise of the encoder cable, earth (ground) the encoder's shielded cable to the metal fitting for earthing
(grounding) with a metal P-clip or U-clip. Refer to the following figure.
• When one encoder is shared between FR-A8AP and CNC (computerized numerical controller), its output signal should be
connected as shown below. In this case, the wiring length between FR-A8AP and CNC should be as short as possible,
within 5 m.
NOTE
• For the details of the optional encoder dedicated cable (FR-JCBL/FR-V7CBL), refer to
• The FR-V7CBL is provided with a P-clip for earthing (grounding) shielded cables.
56
INSTALLATION AND WIRING
2
or larger) to connect the FR-A8AP. For the wiring to the terminals PG and SD,
Example of parallel connection
with two cables
(with complementary encoder output)
FR-A800
(FR-A8AP)
PA1
PA2
FB1
FB2
PZ1
PZ2
PG
SD
2 mm
Parallel connection
Cable gauge 0.2 mm
2
or larger gauge cable. The voltage applied must be within power supply specifications of encoder.
Earthing (grounding) example using a P-clip
Metal fitting for earthing (grounding)
Inverter
(FR-A8AP)
Maximum 5 m
(two parallel cables)
PLG
A
B
C
D
F
G
S
R
2
Larger-size cable
2
0.4 mm or larger
2 2
0.75 mm or larger
2
1.25 mm or larger
Encoder cable
Shield
P-clip
Shield
Position detector
Encoder
CNC
page 53.
2
gauge