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STP-301/451 Series Instruction Manual
10-6
Abnormality
/Error
Operation state
of safety
functions
Lamp
indication
LCD
REMOTE
output signal
State of the STP pump
Probable causes of an
abnormality/error
Reset by
RESET
operation
Overload of
motor driver
Excessive
current flows
in the motor.
"FAILURE"
"OVERLOAD"
"ALARM"
The STP pump
decelerates and stops.
Leakage from the
vacuum equipment or
piping.
Insufficient pressure at
inlet and outlet port
sides.
Failure of starting of the
backing pump.
Possible
Overheating
inside the
STP pump
Temperature of
the STP pump
motor: 110
℃
or more.
"FAILURE" "PUMP
OVERTEMP"
"ALARM"
The STP pump
decelerates and stops.
Abnormal baking
temperature.
Insufficient cooling.
Leakage of vacuum
equipment or piping.
Continuous repetition of
startup/stop.
Extraordinarily-high
temperature.
Possible
Overheating
inside the
STP control
unit
70
℃
or more
inside the STP
control unit.
"FAILURE" "CONTROLLER
OT"
"ALARM"
The STP pump
decelerates and stops.
Failure in the cooling fan.
Shielding of cooling air
inlet and ventilation port.
Extraordinarily-high
temperature.
Possible
Overspeed Rotational
speed of the
STP pump:
51,400 rpm or
more.
"FAILURE" "OVERSPEED"
or
"DRIVER RA"
"ALARM" Breaker
OFF.
Power failure state.
The STP pump stops.
Failure in the motor
driver.
Impossible