STP-301/451 Series Instruction Manual
11-1
Troubleshooting
11 Troubleshooting, Maintenance and Inspection
The STP pump is provided with safety functions for various abnormalities/errors.
When an abnormality occurs in the STP pump or STP control unit, a safety function operates
with the "FAILURE" lamp lit, and an alarm signal is output from remote output terminals.
Also, the LCD displays an error message.
If an abnormality/error is found when using the STP pump, check it and take measures in
accordance with the following procedures.
If you cannot trace it or if the STP pump does not function normally after the
troubleshooting, fill in the necessary information in the "Malfunction Information" and fax it
to Service office.
◇ After confirming that the STP pump stops thoroughly, turn OFF the primary power
(switch the breaker "OFF"), check probable causes and remove them.
11.1 Troubleshooting Immediately After an Abnormality/Error Occurs
11.1.1 In Case of a Power Failure:
Establish a sequence so that the power can be supplied to the STP control unit immediately
after a power recovery.
11.1.2 In Other Cases
1) After confirming the "BRAKE" lamp distinguishes and the STP pump stops, remove the
probable cause of the abnormality.
2) Perform the RESET operation according to turn off the "FAILURE" lamp.
3) Perform the START operation. Check if the STP pump operates correctly.
◇ When disconnecting cables from the STP pump and/or the STP control unit to
perform troubleshooting and take the necessary action, confirm that the STP pump
stops, switch OFF the primary power (breaker "OFF"), then disconnect the cables.
◇ If the RESET operation does not turn off the "FAILURE" lamp, confirm that the STP
pump stops, switch OFF the primary power (breaker "OFF"), then switch "ON" the
primary power again (breaker "ON").
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