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Chapter 1 - Receiving & Installation
Wiring
may trip.
· Thermal Overload Relay
An Underwriter's Laboratory (UL) recognized electronic overload protective function is incorpo-
rated into the inverter. However, when driving several motors with one inverter, or when switching
between multiple windings of a multiple winding motor, connect an external thermal overload relay.
In this case, disable the inverter motor overload feature by setting parameter L1-01 to "0".
· Wiring Distance Between Inverter and Motor
If the total wiring distance between inverter and motor is excessively long and the inverter carrier
frequency (IGBT switching frequency) is high, harmonic leakage current from the wiring may
adversely affect the inverter and peripheral devices. If the wiring distance is long, reduce the inverter
carrier frequency as described below. Carrier frequency can be set by parameter C6-01. Please note
that motor audible noise may increase when lowering the carrier frequency.
Wiring Distance Between Inverter and Motor
Wiring Distance between
(Set value of parameter C6-01)
Grounding
· Ground Resistance
230V class: 100 or less, 460V class: 10 or less, 575V class: 10 or less.
· Never ground the VG5 in common with welding machines, motors, or other high-current elec-
trical equipment. Run all ground wiring in a separate conduit.
· Use ground wiring as specified in "Wire and Terminal Screw Sizes" on page 31, and keep the length
as short as possible.
· When using several VG5 units side by side, ground the units as shown in Figure 12, (a) or (b).
Do not loop the wires as shown in (c).
28
Up to 164 ft.
Inverter and Motor
Carrier Frequency
15kHz or less
(a) Acceptable
Figure 12 Grounding Example of 3 VG5 Inverters
Up to 328 ft.
(50m)
(100m)
10kHz or less
(b) Acceptable
(c) Not Acceptable
VG5 Installation & Quick-Start Manual
More than 328 ft.
(100m)
5kHz or less
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