4-4
(9) Before restarting the pump, confirm that the pump has stopped completely.
Caution
Before restarting the pump, be sure to check that the pump has stopped
completely. Turning on the power while the pump is still rotating causes an
excessive torque on the pump and may cause a failure.
(10) Avoid sudden pressure fluctuations during the operation of the pump.
(11) Check for any abnormal pressure, electric current, vibration, noise, and other abnormal conditions.
If you find any abnormal conditions, take appropriate actions after consulting the Section “0.
(12)
Troubleshooting
(page 6-1).”
Refer to the following chart for vibration vs. rotation speed.
Rotation speed (min
-1
)
Standard vibration value at the bearing section
[For reference only]
Relation between the total amplitude (a)
and the vibration velocity (V)
a =
V×4×10
4
π
×n
a: Total amplitude (
μ
m)
V: Vibration velocity (mm/s)
n: Equipment rotation speed (min
-1
)
(13) Do not allow a large amount of cutting powder from entering the pump. Otherwise, it may clog the
pump strainer, damage the pump, or significantly deteriorate the performance. If you use the
pump in processes such as grinding, milling, or end milling in which a large amount of cutting
powder is discharged, select the pump carefully.
(14) Stop the pump.
Caution
Keep the cocks of the pressure gauges, compound pressure gauges, and
other parts closed all the time except when they are used for
measurement. Otherwise, they are more prone to fail.
Caution
Do not run the pump using the power beyond the allowable current value.
Otherwise, the motor may burn out. For the allowable current value, see
the characteristic curve.
Warning
Do not put your fingers or other objects into the opening of the motor.
Otherwise, it may lead to an electrical shock or injury.
80
60
40
20
10
600 800 1000
1500 2000
3000 4000
6000 8000
100
T
ot
al
am
pl
it
ud
e
(1
/1
0
0
0
mm)
