Vestil PPI-90 - Manual (Page 9)

9
Troubleshooting
Fault Reason Remedy
Not enough voltage
Check the motor potential at work. The voltage may fluctuate
in 10%
Motor do not work Check the motor and electric circuit
Motor turn reverse Change two phases in three freely
Motor lack phase (motor can not
turn and make noise)
Check the fuse and wire connection
restrict-speed valve has been open
Check the restrict-speed valve with voltmeter (the switch
“down” must be loosed). If voltage do not exist, check
the electric circuit. Otherwise, clean the restrict-speed
valve or change it.
Not enough pressure Regulate the overflow valve under the full load
Not enough hydraulic oil Fill the oil-tank with hydraulic oil
Filter tip has been blocked up Clean the filter tip
There is air in oil pipe
Check the oil pipe and joint. Twist the joint firmly or change
it if necessary
The platform
can not rise
Overload Reduce the load
One-direction valve leak oil Clean the one-direction valve or change it if necessary
Restrict-speed valve has not been
sealed
Check whether voltage exist on the restrict-speed valve. If
exist, clean the restrict-speed valve or change it.
Platform
self-descend
Cylinder leak oil Change the seal unit in the cylinder or change the cylinder
Restrict-speed valve lose efficacy
Check whether voltage exist on the restrict-speed valve. If
exist, clean the restrict-speed valve or change it.
Platform can not
descend
Restrict-speed valve dislocation
Regulate the restrict-speed valve, if regulation has not use ,
change the valve
Vestil Manufacturing Corp. www.vestil.com 800-348-0868