SH-110 Dry Scroll Vacuum Pump
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Troubleshooting
Use the Troubleshooting chart in Table 5 to assist in defining a problem, determining a possible cause, and defining action
steps to remedy the situation.
Table 5 Troubleshooting Chart
Problem Possible Causes Corrective Actions
Will not start One or both fuses blown Replace fuses.
Identify cause of overload.
Check the line voltage and the voltage configuration of the pump.
Motor thermal protector open Allow motor to cool.
Identify cause of overload.
Excessive voltage drop Check size and length of cable.
Defective motor Inspect. Contact Agilent.
Poor ultimate
pressure
System leak Locate and repair leak.
Water in pump Flush pump with air or dry nitrogen.
Gas ballast plugged Replace breather vent. Contact Agilent.
Solvent in pump Flush pump with air or dry nitrogen.
Install trap or filter.
Seals worn out Rebuild pump.
Poor conductance to pump Replumb with shorter and/or larger diameter tubing.
Hammering noise Pump overheated Check ventilation to pump.
Check ambient temperature.
Debris in pump Check intake screen.
Flush pump.
Disassemble pump and inspect.
Pump runs
intermittently
Motor thermal protector is
cycling open and closed.*
Allow the motor to cool.
Identify the cause of the overload.
*
The SH-110 is equipped with an auto-reset thermal motor protector. This protector will automatically shut down the
pump when it detects an overload condition, and will automatically restart the pump when the motor has cooled to
within an acceptable temperature range.
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