Mitsubishi Electric A800 Plus Instruction Manual page 65

Connection of motor with encoder (vector control)
Instructions for encoder cable wiring
• Use shielded twisted pair cables (0.2 mm
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
∗1
∗1
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 enclosure
(as close as possible to the inverter) with a P-clip or U-clip made of metal.
• 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.
Inverter
(FR-A8AP)
(two parallel cables)
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.
64
INSTALLATION AND WIRING
∗1
The pin number differs according to the encoder used.
The control works properly with or without the Z-phase being connected.
∗2
Connect the encoder so that there is no looseness between the motor and motor shaft. Speed ratio must be 1:1.
∗3
Earth (ground) the shield of the encoder cable to the enclosure using a tool such as a P-clip. (Refer to
∗4 For the complementary, set the terminating resistor selection switch to OFF position. (Refer to
∗5
A separate power supply of 5 V / 12 V / 15 V / 24 V is necessary according to the encoder power specification.
When the encoder output is the differential line driver type, only 5 V can be input.
Make the voltage of the external power supply the same as the encoder output voltage, and connect the external
power supply between PG and SD.
∗6 For terminal compatibility of the FR-JCBL, FR-V7CBL, and FR-A8AP, refer to
2
or larger) to connect the FR-A8AP. For the wiring to terminals PG and SD, use
Example of parallel connection
(with complementary encoder output)
FR-A800
(FR-A8AP)
PA1
PA2
FB1
FB2
PZ1
PZ2
PG
SD
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
Encoder
NC
Maximum 5 m
with two cables
Encoder
A
B
C
D
F
G
S
R
2
2 mm
Larger-size cable
2
0.4 mm or larger
2 2
0.75 mm
2
1.25 mm
Encoder cable
Shield
P-clip
page
page 63.
or larger
or larger
page 62.
page 64.)
61.)
2
gauge