Whenever my home phone rings in the early hours of the morning it usually means one thing, trouble!
It was a call from the Sawmills. There pump and servo valve had gone down.
The system drives a carriage complete with log attached, back and forth through a huge band saw. Without the pump and servo the plant comes to a standstill.
The piston pump with servo valve is part of a closed circuit and coupled to a fixed displacement piston motor.
My customer had already decided to replace the hydraulic drive with an electric motor and inverter but delivery one still some weeks away. So was there anything we could do meantime?
Repair was out of the question, the pump was obsolete and repair would take weeks.
I decided to use an 11kw power-pack in storage and couple the motor open circuit. We installed a simple hand valve for the operator and by lunchtime the next day they were cutting wood.
I hope that if they have future problems with the inverter drive they will be able to get the same response?
Very Best
Bob
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