C
HAPTER
3 – S
ITE
P
REPARATION
23
Connecting a Transformer
It is important that proper grounding procedures be followed when hooking up machines
to power. Please review the following pages. They explain proper transformer
connections and checks to ensure proper connections. Refer to the autotransformer
diagram provided to verify that your connections are suitable.
** Spindle and axis drive damage results from incorrect transformer connection.**
Cautions!
1.
Arc flash and shock hazard.
Follow ALL requirements in NFPA 70E for safe
work practices and for Personal Protective Equipment before opening electrical
cabinet or performing adjustments or diagnostic measurements while energized.
2. Be sure to turn off all power to the transformer prior to making connections or
resistance readings. Disconnect the transformer completely from power.
3. Always measure voltage from line to line and from line to ground before applying
power to the machine electrics. Do this with or without the addition of a
transformer.
4. With or without a transformer any power leg of the three phase incoming power
to the machine should not exceed 240 VAC to ground, or from leg to leg. At least
two of the legs when measured between the leg and chassis ground should
measure the same voltage.
5. The grounding wire going into the machine must be connected to a neutral point
within the transformer windings and to earth ground. This is provided as a tap on
the transformer.
6. When a green wire appears to go to the transformer housing, never assume that
it is grounded properly. Follow the green wire to verify it is not merely a case
ground but instead is tied to a neutral point in the transformer windings.
Always call the factory if in doubt concerning transformer connections as serious
damage can result if the machine or transformers are not properly connected.
Summary of Contents for ML Series
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Page 23: ...CHAPTER 2 SPECIFICATION ML14 26 Series Machine Layout 17 ...
Page 24: ...ML35 40 Series Machine Layouts ML35 Series ML40 Series 18 ...
Page 33: ...CHAPTER 3 SITE PREPARATION 27 ML22 ML26 Lifting device drawing ...
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