3.8 Control Circuit Wiring
82 YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
Equipment Hazard. Do not connect control circuit ground terminals to the drive enclosure. Improper drive grounding can
cause control circuit malfunction.
NOTICE: Equipment Hazard. Insulate shields with heat shrink tubing or tape to prevent contact with other signal lines and equipment.
Improper wiring practices could result in drive or equipment malfunction due to short circuit.
NOTICE: Equipment Hazard. Use twisted-pair or shielded twisted-pair cables for control circuits. Improper wiring practices could result
in drive or equipment malfunction or nuisance trips.
NOTICE: Connect the shield of shielded cable to the appropriate ground terminal. Improper equipment grounding could result in drive
or equipment malfunction or nuisance trips.
NOTICE: Separate wiring for output terminals MA, MB, MC, M1 and M2 from wiring to other control circuit lines. Improper wiring
practices could result in drive or equipment malfunction or nuisance trips.
NOTICE: Separate control circuit wiring from main circuit wiring (terminals R/L1, S/L2, T/L3, B1, B2, U/T1, V/T2, W/T3, -, +1, +2) and
other high-power lines. Improper wiring practices could result in drive malfunction due to electrical interference.
NOTICE: Use a class 2 power supply (UL standard) when connecting to the control terminals. Improper application of peripheral
devices could result in drive performance degradation due to improper power supply.
NOTICE: Do not exceed 50 meters (164 ft.) for the control line between the drive and the operator when using an analog signal from a
remote source to supply the frequency reference. Failure to comply could result in poor system performance.
NOTICE: Do not use unshielded cable for control wiring. Failure to comply may cause electrical interference resulting in poor system
performance. Use shielded, twisted-pair wires, and ground the shield to the ground terminal of the drive.
NOTICE: Insulate shields with tape or shrink tubing to prevent contact with other signal lines and equipment. Improper wiring practices
could result in drive or equipment malfunction due to short circuit.
Wire the control circuit only after terminals have been properly grounded and main circuit wiring is complete. Refer to
Figure 3.22 for details. Prepare the ends of the control circuit wiring as shown in Figure 3.23. Refer to Wire Size and
Torque Specifications on page 81.
WARNING! Do not tighten screws beyond the specified tightening torque. Failure to comply may result in erroneous operation, damage
the terminal block, or cause injury due to fire from overheating of loose electrical connections.
NOTICE: Use shielded twisted-pair cables as indicated to prevent operating faults. Improper wiring practices could result in drive or
equipment malfunction due to electrical interference.
Connect control wires as shown in Figure 3.22.
Figure 3. 21
Figure 3.22 Terminal Board Wiring Guide
A – Loosen screw to insert wire C – Avoid fraying wire strands when stripping
insulation from wire. Strip length 5.5 mm (0.22 in.)
B – Single wire or stranded wire D – Blade depth of 0.4 mm (0.02 in.) or less
Blade width of 2.5 mm (0.10 in.) or less
A
B
C
D
Preparing wire
terminal ends
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