Gasboy Atlas Start-up - Manual (Page 182)

Page 6-62 MDE-4334D Atlas™ Start-up and Service Manual · July 2013
Hydraulic/Mechanical Components Pump Motor
Pump Motor
About Electric Motor for Self-contained Pump Units
This section explains about the electric motor for self-contained pump units.
Motor Loads
Following chart shows the maximum running amperage that can be expected for the pump
motor, unless noted otherwise:
Model Motor Rating
115 V
50/60 Hz
1PH
230V 50/60 Hz 1PH
230V 50/60 Hz
3PH 380V 50/60 Hz
3PH
8X5XK, 9X52K, 9X53K 13 A 6.5 A 3.4 A 2.3 A
9X40K 13.0 A per
motor 6.5 A per motor 3/4 A per motor 2.3 A per motor
9850K 13.0 A 6.5 A 3.4 A 2.3 A
Thermal Overload
Most motors have a thermal overload switch to open the circuit automatically if the motor is
overheated or drawing excessive current. When the switch cools, it activates and turns the
motor back on. Motors do not require a manual reset. The 220/380 VAC motors do not have a
thermal overload switch.
If overload shut-off occurs frequently:
• Check the voltage switch for proper voltage selection (110/230/240/380).
• Check for free pump and motor shaft rotation.
• Check the Pump Bypass Valve and relief pressure setting.
• Check the belt tension.
• Check the line voltage during operation with the nozzle closed and then with the nozzle
open. Low or high voltages (greater than +/- 10%) can cause overheating or premature
failure.
• NFPA requires explosion-proof motors. Only use an Atlas-specified explosion-proof
motor for replacement.
Service Tips
• Frequently, low voltages during operation can result when the PRV is set to too high a
pressure, or wiring to the motor is inadequately sized for the motor load.
• Premature motor failures are usually caused by continuous operation at too low a voltage
or high pressure setting at the PRV.