Instructions For Wiring Pulse Generator - Mitsubishi AJ65BT-D62 User Manual

4. INSTALLATION AND PRE-OPERATION SETTING PROCEDURE

4.6.2 Instructions for wiring pulse generator

High-speed
counter
module
Inverter
Terminal Terminal
block block
Separate more than 150mm
(5.91inch)from high-power
equipment such as inverters,
etc.
(Also take care of wiring
inside the panel.)
V W E
AC motor
Power supply for encoder
To phase A
To phase B
To high-speed counter module
When connecting a pulse generator to the high-speed counter module, take the
following precautions.
(1) When using high speed pulse inputs, take the following precautions against noise
(a) Always use shielded twisted cables. Also provide Class 3 grounding.
(b) Do not run a twisted pair cable in parallel with any power line, I/O line, etc.
which may generate noise. It is necessary to run the twisted pair cable at least
150mm(5.91inch) away from the above lines and over the shortest possible
distance
(2) For a 1-phase input, always connect the count input pulse to phase A.
(3) If the high-speed counter module picks up noise, it will count incorrectly.
(4) The diagram below indicates the type of precautions required to prevent the wiring
from picking up noise.
In metal piping, never run solenoid or inductive wiring through the same piping.
If sufficient distance cannot be provided between the high current line and input
wiring in a conduit, use shielded cable such as CVVS for the high current line.
Carrier
· Ground the twisted shield cable on the encoder side (joint box). (This is a connection
example for 24V sink load.)
+24V
0V
A
B
24V
E
The distance between the encoder and joint box should be as
Joint box
short as possible.
If the distance from the high-speed counter module to the encoder
is too long, an excessive voltage drop will occur.Therefore, measure
voltages with a tester or the like during operation and stop of the
encoder, and check that the voltages are within the rated voltage
of the encoder. If the voltage drop is large, increase the size of
wiring or use an encoder of 24VDC with less current consumption.
Encoder
To encoder
Connect the encoder shield wire to the shield wire of the twisted
cable inside the joint box. If the shield wire of the encoder is not
grounded in the encoder, ground it inside the joint box as indicated
by the dotted line.
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MELSEC-A