YASKAWA HV600 Technical Reference page 88

3.3 Main Circuit Wiring
WARNING! Sudden Movement Hazard. Make sure that you align the phase order for the bypass and motor when you connect the
motor to output terminals U/T1, V/T2, and W/T3. If the phase order is incorrect, it can cause the motor to run in reverse. If the motor
accidentally runs in reverse, it can cause serious injury or death.
NOTICE: Do not connect phase-advancing capacitors, LC/RC noise filters, or leakage breakers (GFCI) to the motor circuit. If you
connect these devices to the output circuits, it can cause damage to the bypass and connected equipment.
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Cable Length Between Bypass and Motor
When the wiring between the bypass and the motor is too long, voltage drop along the motor cable can decrease
motor torque, usually at low frequency output. If you use a long motor cable to connect motors in parallel, this is also
a problem. Output current increases when the leakage current from the cable increases. An increase in leakage current
can cause overcurrent and decrease the precision of current detection.
If the system configuration makes the motor wiring distance more than 100 m (328 ft), do not use metal conduits or
use isolated cables for each phase to decrease stray capacitance.
Table 3.11 Carrier Frequency against Cable Length Between Drive and Motor
Wiring Distance between the Bypass and Motor
Carrier Frequency
Note:
• For bypass models D004 to D016, A002 to A015, and B001 to B014:
–Shorter than 10 m: No carrier frequency derating from default setting (5 kHz) is necessary.
–10 m to 50 m: 5 kHz to 2 kHz is necessary.
–50 m and longer: 2 kHz
• To set the carrier frequency in a bypass that is operating more than one motor, calculate the cable length as the total distance of wiring to all
connected motors.
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Ground Wiring
Follow these precautions to wire the ground for one bypass or a series of bypasses.
WARNING! Electrical Shock Hazard. Make sure that the protective ground wire conforms to technical standards and local safety
regulations. The IEC/EN 61800-5-1:2007 standard specifies that you must wire the power supply to automatically de-energize when
the protective ground wire disconnects. You can also connect a protective ground wire that has a minimum cross-sectional area of
2
10 mm (copper wire) or 16 mm
death. The leakage current of the bypass will be more than 3.5 mA.
WARNING! Electrical Shock Hazard. Ground the neutral point on the power supply of the bypass to comply with the EMC Directive
before you turn on the EMC filter. If you turn ON the EMC filter, but you do not ground the neutral point, it can cause serious injury or
death.
WARNING! Electrical Shock Hazard. Use a ground wire that complies with technical standards on electrical equipment and use the
minimum length of ground wire. Incorrect equipment grounding can cause serious injury or death from dangerous electrical
potentials on the equipment chassis.
Note:
• Only use the bypass grounding wire to ground the bypass. Do not share the ground wire with other devices, for example, welding machines
or large-current electrical equipment. Incorrect equipment grounding can cause incorrect operation of equipment.
• To connect more than one bypass to the same grounding circuit, use the instructions in the manual. Incorrect equipment grounding can
cause incorrect operation of equipment.
When you install more than one bypass, refer to
88
2
(aluminum wire). If you do not obey the standards and regulations, it can cause serious injury or
Figure
Figure 3.5 Wiring More than One Bypass
100 m (328 ft) Maximum
3.5. Do not loop the grounding wire.
YASKAWA SIEPYAIH6B01A HV600 AC Drive Bypass Technical Reference
2 kHz or less