Main Circuit Terminal And Motor Wiring - YASKAWA L1000A Technical Manual

3.7 Main Circuit Wiring

◆ Main Circuit Terminal and Motor Wiring

This section outlines the various steps, precautions, and checkpoints for wiring the main circuit terminals and motor
terminals.
WARNING! Electrical Shock Hazard. Before servicing, disconnect all power to the equipment and lock out the power source. Failure to
comply may result in injury from electrical shock. Wait at least five minutes after all indicators are OFF and measure the DC bus voltage
level and main circuit terminals to confirm the circuit is safe before wiring.
WARNING! Electrical Shock Hazard. Verify motor wiring bare wire ends do not contact the drive chassis or enclosure when wiring drive
terminals U/T1, V/T2, W/T3. Failure to comply may result in serious injury or death due to electrical shock.
WARNING! Electrical Shock Hazard. Improper equipment grounding could result in death or serious injury by contacting the motor
case. Always properly ground the motor-side grounding terminal.
WARNING! Fire Hazard. Tighten all terminal screws to the specified tightening torque. Loose electrical connections could result in
death or serious injury by fire due to overheating of electrical connections. Improperly tightened terminal screws can also cause
erroneous equipment operation.
WARNING! Fire Hazard. Do not use an improper voltage source. Failure to comply could result in death or serious injury by fire. Verify
that the rated voltage of the drive matches the voltage of the incoming power supply before applying power.
WARNING! Do not connect the AC power line to the output motor terminals of the drive. Failure to comply could result in death or
serious injury by fire as a result of drive damage from line voltage application to output terminals.
NOTICE: Equipment Hazard. Separate motor and/or braking circuit wiring (terminals, U/T1, V/T2, W/T3, +3, +2, +1,(-), B1, B2, from all
other wiring. Place motor wiring within its own conduit or cable tray with appropriate divider, and use shielded motor cable where
appropriate. Improper wiring practices could result in malfunction of drive due to electrical interference.
NOTICE: Equipment Hazard. Comply with proper wiring practices. The motor may run in reverse if the phase order is backward,
causing incorrect elevator direction movement and injury to personnel. Connect motor input terminals U/T1, V/T2, and W/T3 to drive
output terminals U/T1,V/T2, and W/T3. The phase order for the drive and motor should match.
NOTICE: Equipment Hazard. Improper equipment sequencing could shorten useful life of the electrolytic capacitors and circuit relays
of the drive. Refrain from switching an input contactor more often than once every 30 minutes. Normally the drive I/O should be used to
stop and start the motor.
NOTICE: Equipment Hazard. Standard motors used with PWM drives may experience winding failures due to surge voltages, when
input line voltage is greater than 480 V or motor wire distance is greater than 100 meters. Select a motor design with insulation tolerant
of surge voltages and drive-rated motor for use with PWM drives. Failure to comply could lead to motor winding failure.
NOTICE: Do not use the negative DC bus terminal "-" as a ground terminal. This terminal is at high DC voltage potential. Improper
wiring connections could damage the drive.
NOTICE: Improper application of devices on drive output circuits can damage the drive. Do not connect unapproved LC or RC
interference suppression filters, capacitors, ground fault circuits, or overvoltage protection devices to the output of the drive.
NOTICE: Do not connect phase-advancing capacitors or LC/RC noise filters to the output circuits. Failure to comply could result in
damage to the drive, phase-advancing capacitors, LC/RC noise filters or ground fault circuit interrupters.
NOTICE: Properly integrate auxiliary contacts into the control logic circuit to avoid unnecessary fault displays caused by contactors or
output switches placed between drive and motor. Improper installation of input and output contactors could result in damage to the
drive.
NOTICE: Before applying power to the drive, use power-off resistance checks to check for short-circuits between (R/L1, S/L2, and
T/L3) or between main circuit terminals and ground. Failure to comply may result in damage to the drive.
Cable Length Between Drive and Motor
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Voltage drop along the motor cable may cause reduced motor torque when the wiring between the drive and the motor is
too long, especially at low frequency output. This can also be a problem when motors are connected in parallel with a
fairly long motor cable. Drive output current will increase as the leakage current from the cable increases. An increase in
leakage current may trigger an overcurrent situation and weaken the accuracy of the current detection.
Adjust the drive carrier frequency according to
the system configuration, reduce the ground currents.
NOTICE: Equipment Hazard. Separate motor and/or braking circuit wiring (terminals, U/T1, V/T2, W/T3, +3, +2, +1,(-), B1, B2, from all
other wiring. Place motor wiring within its own conduit or cable tray with appropriate divider, and use shielded motor cable where
appropriate. Improper wiring practices could result in malfunction of drive due to electrical interference.
Cable Length
Carrier Frequency
Note: When setting carrier frequency for drives running multiple motors, calculate cable length as the total wiring distance to all
connected motors.
76
Table 3.5. If the motor wiring distance exceeds 100 m (328 ft.) because of
Refer to C6-03: Carrier Frequency on page
Table 3.5 Cable Length Between Drive and Motor
50 m (164 ft.) or less
15 kHz or less
YASKAWA ELECTRIC SIEP C710616 38F YASKAWA AC Drive - L1000A Technical Manual
100 m (328 ft.) or less
5 kHz or less
182.
Greater than 100 m (328 ft.)
2 kHz or less