Hitachi E-U Series, Instruction Manual, Page: 17 / 24

5. START UP
Follow the steps below during start up of the Vortex Blower.
1. Power Supply Check
Check:
• Switch Capacity
• Ground
• Power Supply Connections
• Contact Defect In A Switch
If current does not flow through the
wire because of a break in the power
supply or a contact defect in a
switch, the Vortex Blower operation
will single phase. This may cause
the motor burnout.
2.
Rotation Direction Check
Inspect the Vortex Blower for proper
rotation direction as shown on the
nameplate. Rotation direction can be
checked using the following two (2)
procedures:
• Insert a rod through the hole in the
end cover and rotating the outer fan.
• Confirm whether the air flow of the
Vortex Blower suction/discharge ports
coincides with the IN or OUT
directional stickers.
If the rotation direction is reversed,
change the connections of two of the
three power supply cables.
(The rotation direction does not
reverse on the 1 phase Vortex
Blower.)
3.
Operating Static Pressure and Amperage Current Check
Provide a bypass hole that will allow
air to escape if the static pressure is
greater than the maximum
operating static pressure.
Use a pressure gauge and ammeter to verify
that the operating static pressure and
amperage current are less than the
maximum ratings.
4. Operating Conditions Check
Inspect:
• Is there an unbalanced
voltage on the power supply?
• Is there excessive vibration or noise?
• Current unbalance:
Less than ± 5%
• Voltage fluctuation:
Less than ± 10%
If these values are not within the
operating ranges, the Vortex Blower
motor may fail.
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