Yaskawa AC Drive-L1000E Safety Precautions User Manual
Page 17
5 Electrical Installation
YASKAWA TOEP YAIL1E 02A YASKAWA AC Drive - L1000E Safety Precautions
17
Wire Gauges and Tightening Torque
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! 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.
Use the tables in this section to select the appropriate wires and crimp terminals.
Gauges listed in the tables are for use in the United States.
Note: 1. Wire gauge recommendations based on drive continuous current ratings using 75°C (167°F) 600 Vac vinyl-sheathed wire assuming
ambient temperature within 40°C (104°F) and wiring distance less than 100 m (328 ft.).
2. Terminals B1, B2, -, +1, +2, and +3, are for connecting a DC link choke, braking resistor or DC power supply. Do not connect other
nonspecific devices to these terminals.
• Consider the amount of voltage drop when selecting wire gauges. Increase the wire gauge when the voltage drop is
greater than 2% of motor rated voltage. Ensure the wire gauge is suitable for the terminal block. Use the following
formula to calculate the amount of voltage drop:
Line drop voltage (V) =
× wire resistance (Ω/km) × wire length (m) × current (A) × 10
-3
• Refer to instruction manual TOBP C720600 0 for braking transistor option or braking resistor option wire gauges.
• Use terminal +1 and the negative terminal when connecting a regenerative converter or a regen unit.
• Use terminal B1 and - when installing the braking unit to the drives with built-in braking transistor (2A0018 to 2A0144,
4A0009 to 4A0075).
•
Refer to UL Standards Compliance on page 42
for information on UL compliance.
Yaskawa recommends using closed-loop crimp terminals on all drive models. UL/cUL approval requires the use of
closed-loop crimp terminals when wiring the drive main circuit terminals on models 2A0106 to 2A0432 and 4A0056 to
4A0260. Use only the tools recommended by the terminal manufacturer for crimping. Refer to
for closed-loop crimp terminal recommendations.
The wire gauges listed in the following tables are Yaskawa recommendations. Refer to local codes for proper wire gauge
selections.
Note: The mark indicates the terminals for protective ground connection. (as defined in IEC60417-5019)
Grounding impedance;
200 V: 100
Ω or less
400 V: 10
Ω or less
3