Operation And Daily Inspection - Hitachi E-U Series Instruction Manual

6. OPERATION AND DAILY INSPECTION

1. Continuous Operation Limitations
• Continuous operation should be maintained on or within the solid line of the performance
curve.
• Maximum operating pressure is indicated on the Vortex Blower nameplate.
• Check the maximum operating pressure by using a pressure gauge.
• For continuous operation at low air volume (close to zero (0) volume or on the dotted portion of
performance curve), provide a bypass hole in the piping and operate at a pressure lower than
maximum operating pressure.
2. Temperature Rise
• The motor is a NEMA class B insulation system.
• Maximum winding temperature is 266
• If the thermal protector, or thermal relay, activates due to an excessive motor temperature rise
to the motor, the following items should be researched:
Vortex Blower has a phase unbalance (must be within than ±5%).
o
Vortex Blower has a voltage fluctuation (must be within than ±10% of the rated
o
voltage).
Vortex Blower is operating in a dusty environment that may impair impeller
o
performance.
Vortex Blower's operating pressure is higher than the maximum operating pressure.
o
Vortex Blower is operating at no flow or on the dotted portion of performance curve
o
Vortex Blower has single phased (this only applies with a 3 phase motor)
o
1. Verify that the operating static pressure is below the maximum operating static pressure using a
pressure gauge.
2. Verify that the amperage current is below the maximum amperage current using an ammeter.
3. Inspect for excessive vibration and noise.
• Vibration in the motor unit should be less than 40μm (double amplitude).
• Vibration in the blower unit should be less than 100μm (double amplitude).
4. Inspect for dust accumulation on the outer surface of the motor and Vortex Blower. To prevent
dust from interfering with the cooling function, clean the outer surface of the motor and Vortex
Blower periodically.
5. During a power failure shut off the power supply to the Vortex Blower.
6. Turn off the power supply to the Vortex Blower before performing any disassembly work.
OPERATION
F (130 C).
o o
DAILY INSPECTION
- 18 -