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Gemini GT Hardware Installation Guide
Step 2 – Connecting AC Power
GT-L5 and GT-L8 can be operated only at 120VAC.
GT-U5 and GT-U8 can be operated at 120VAC or single phase 240VAC.
Acceptable ranges of AC input voltage are listed below:
Drive AC Input Range
GT-L5 95VAC – 132VAC
GT-L8 95VAC – 132VAC
GT-U5 95VAC – 132VAC and 190VAC – 264VAC
GT-U8 95VAC – 132VAC and 190VAC – 264VAC
CAUTION
You must connect V DBL to L2/N on GT-U5 and GT-U8 to enable the voltage
doubler for 120VAC operation.
WARNING
You must connect the drive’s protective conductor terminal, marked with the
symbol, to a reliable system safety earth. Make the connection directly, by means
of a low impedance path less than or equal to 0.1 ohm (no fuses, etc.). Under
normal operation, no current should flow through the safety earth connection.
WARNING
The drive’s barrier strip terminals are at hazardous voltages when power is applied
to the drive, and up to 30 seconds after power is removed. Reinstall the clear
plastic terminal cover after you make connections.
Fuse Information
Gemini drives have no internal fuses. For safety, you must provide a fuse in each
of the AC input lines. Recommended fuse types and sizes are:
GT-L5/GT-L8 (120VAC) GT-U5/GT-U8 (120VAC) GT-U5/GT-U8 (240VAC)
125VAC Time Delay 125VAC Time Delay 125VAC Time Delay
10 amp 10 amp 10 amp
Type RK5 or better Type RK5 or better Type RK5 or better
The next table lists part numbers for suitable fuses, from several manufacturers:
Amps: Bussman: Gould: Littelfuse: Grainger:
10 FRNR10 TR10R FLNR10 1A693
GT-L5 and GT-L8 AC Power Connections
Connections are illustrated in the next drawing, on the left.
CAUTION
Do not operate GT-L5/8 above 132VAC, or the drive will be permanently damaged.
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