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EDM Support

Q: We moved our CHMER G64 Wire EDM machine to a
new location in the shop. Everything seems fine, except

there is no water flowing through the filter unit. Do you

have any ideas?
A: : It sounds like you did not check the pump rotation!
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Most 3-phase pumps will only work if they rotate in the
direction noted on the pump motor label.

The pump on the left is for flushing, and the pump on the
right is for cooling and work tank water circulation - see
Figure 2B
Figure 2A
Figure 1. These vertically mounted pumps will not lose
prime because the pump section is submerged.
simply reversing two of the three power wires (Not
including the ground wire)
If your machine has a horizontally mounted pump, you
must also ensure the pump is primed – see Figure 3.

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Figure 1
Figures 2A and 2B show the label on the top of the pumps
indicating the correct pump rotation direction.
These pumps operate in different directions. Be sure to
Figure 3
check the rotation label on each pump.

Turn off the pump, remove the hex-shaped plug, fill the
There are various ways of checking rotation. Some people
reservoir slowly with water until full, then reinstall the plug
start the pump, and the direction can be observed when
it begins to turn. Normally, in a case where the machine
If you find that no matter how much water you put in, it

was moved, you only need to check the direction of one

does not fill, you could have a bad check valve on the
pump. If the pump is rotating in the wrong direction, you and turn it on -see Figure 4.
can reverse it by completely powering down the machine bottom of the intake tube for the pump.
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down, turning off the main power to the machine, and then
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