IND-SFC Series
Wiring Precaution
Whether the capacity of the frequency converter in accordance with your loads.
Whether the frequency converter damaged during transportation, if so, do not connect it to power source.
Shut down power before wiring, check the input voltage before installation.
Make sure the specification of the cable in accordance with the frequency converter before wiring. The
cable diameter should follow the voltage level and capacity of the frequency converter.
Please refer to electrician wiring regulations, or following the "Cable Diameter Reference" table.
Avoid sharing the power switch of the frequency converter with other appliances.
Use O-type wiring terminals, make sure it's well-wired, tighten screws to avoid poor contact and prevent
electric shock.
Make sure the power source is correct to match single phase or three phase frequency converter.
For grounding, refer to the next page.
Make sure all switches on "OFF" status before connecting the frequency converter to power source.
Make sure the power source, frequency converter and loads are matching before power on.
Internal semiconductor components are sensitive to static electricity, be careful in touching the metal
control panel.
Larson Electronics, LLC
Phone: (877) 348-9680
Fax: (903) 498-3364
www.larsonelectronics.com
Grounding System
In addition to safety consideration, well-grounded system also can avoid the power system interferes
equipment normal operation.
Ground Cable should be separated with Neutral Cable, unless special applications.
Ground Cable should be 8AWG cable at least or the diameter is basically the same.
Ground Cable is for specified frequency converter only, poor ground will cause interference to other
machines.
Use ground rods in grounding for the best.
Ground Types:
tem Applica
tion
Item
Resistance value
1
Low voltage power supply system or high voltage electrical
equipment of three-phase four-wire multi-grounded systems
grounding
10
Ω
or less
2
Ungrounded high-voltage electrical equipment grounding
system.
25
Ω
or less
3
Low voltage power supply system of three-phase three-wire
ungrounded system.
50
Ω
or less
4
1.. round voltage less than 150V is 100
Ω
or less.
2.. round voltage 151V to 300V is 50
Ω
or less.
3.. round voltage higher than 301V is 10
Ω
or less.
1.
Low voltage electrical equipment grounding
2.
Inner system grounding
3.
Frequency converter secondary grounding
4.
Low voltage electrical equipment metal body
grounding.
