LS ELECTRIC L7NHF Series, User Manual

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2. Wiring and Connection
2-8
2.4
Power Supply Wiring

Ensure that the input power voltage is within the acceptable range.
Caution
Excessive voltage damages the drive.

If a commercial power supply is connected to U, V and W terminals of the drive, the drive may be
damaged. Be sure to connect power to L1, L2, L3 terminals.

Connect short-circuit pins to the B and BI terminals. For external regeneration brake resistors,
remove the short-circuit pins and use standard resistors for the B+ and B terminals.
Models
Resistance
Values
Standard
Capacity
* Notes
L7NHFA010U
40[Ω]
Built-in 100 W
Caution
For information about resistance during regenerative
capacity expansion, refer to Section 2.4.4,
"Regenerative Resistor Options.”
L7NHFA035U
13[Ω]
Built-in 150 W
L7NHFA050U
6.8[Ω]
Built-in 120 W
L7NHFA075U
6.8[Ω]
Built-in 240 W

Configure the system so that the main power (L1, L2, L3) is supplied after the control power (C1,
C2). (Refer to section 2.4.1, “Power Supply Wiring Diagram.”)

High voltages may remain in the device for sometime even after the main power is disconnected.
Be careful.
Warning
Before resuming wiring, make sure to disconnect the main power and that the charge lamp is
completely turned off. Failure to do so may result in electric shock.

Always ground the device using the shortest possible ground wire. Long ground wires are easily
influenced by noise, which causes malfunctions.