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ppr fittings-NF-4011-Newsun Industry Co., Ltd
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Coolant pump runs automatically

Coolant pump runs automatically


It is a retrofitted used CNC lathe, the problem is the coolant pump runs as soon as the machine power turn on, and could not turned off by any way.


1-      Check if there is any wrong wiring of the coolant pump.

2-      The relay is broken or not?

3-      Check the I/O board of the CNC controller.


In this case we found the relay contactor for the coolant pump was stuck, change it then back to normal.

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