D Table 7.3 Cable (4) Remedy for Radio Frequency Interference
Type of Lead Allowable Conductor (R.F.I)
Temperature SERVOPACK may interfere with radio reception. If the
Vinyl Cable (PVC) -- controller interferes with radio reception, connect a
600 V Vinyl Cable (IV) 60 noise filter to power supply.
Special Heat-ResistantCable (HIV) 75 (5) The signal line uses cables whose core is extremely
fine (0.2 to 0.3m_]). Avoid using excessive force which
Notes:
1.For main circuits, use cablesof 600V or more. may damage these cables.
2.Where cables are bundled or run through a duct (unplasticized
polyvinyl chloride conduit or metalic conduit), select the larger 7.3.3 Power LQSS "
cable size than listed considering the current drop rate of the ca-
bles. The power.loss of SERVOPACK is shown in
3.Where the ambient (panel inside) temperature is high (40_; to Table 7.4.
60°(2), use heat-resistant cables.
7.3.2 Wiring Precautions Table 7.4 Power Loss st Rated Output
Power Loss
SERVOPACK is a device for speed control of 3000:1, SERVOPACK Output
and signal level of several milli-volts or less. Type Current Main Regenerative Control Total
D The following precautions should be taken for wiring. CACR, A Circuit Resistance Circuit
W W W W
(1) For signal lines and PG feedback lines, use twisted SR03BB 3.0 20 90
cables or multi-core shielded twisted-pair cables 10
(YASKAWA Drawing No. DP8409123 or DE8400093). SR05BB 4.2 4O 110
Cable length is a maximum of 3m for reference input SR07BB 5.8 60 140
lines and a maximum of 20m for PC- feedback lines. SR10BB 7.6 70 20 150
Use the shortest possible length. SR15BB 11.7 80 60 160
(2) For ground line, cable should be as heavy as possi- SR20BB 18.8 100 40 200
ble to provide class 3 ground (ground resistance 101_ or
D less). Use central grounding point. If the motor and SR30BB 26.0 160 80 300
machine are insulated, ground the motor. SR44BB 33.0 210 100 370
(3) To prevent malfunction due to noise, take the fol- SR60BB 45.0 300 120 480
lowing precautions:
• Place the noise filter, SERVOPACK and I/O refer- Note: The regenerative resistor causespower losswhen the motor is
ence as near as possible to each other, decelerated, but is negligibleif the motor is not started and stopped
frequently.
• Make sure to mount a surge absorbing circuit into
the relay, electromagnetic contact, and solenoid coils.
D • Run the power line and signal line, holding the dis-
tance to 30cm or more; do not run them in the same
duct or in a bundle.
• When the same power is used for SERVOPACK, as
for an electric welder or electrical discharge machine
or when a high-frequency noise source is present in
the vicinity, use filters in the power and input cir-
cuits.
• The SERVOPACK uses a switching amplifier, and
electrical noise may be present in the signal line.
Never leave the termination of the analog input wir-
ing open.
-49 -
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