Seiko Instruments MT-17E-003-D instruction manual Abnormality

STP-H600/H1000 Series Instruction Manual

Table 6.3 Safety Functions

[E.V. used herein is the abbreviation for Emergency Vent.]

Abnormality	Operation state of safety	Lamp indication	REMOTE	State of the STP pump	Probable causes of an
/Error	functions		output signal		abnormality/error
Power failure	Failure time: 2 seconds or	"BATTERY	"ALARM"	Levitation continues by battery.	Power failure.
	more (for details, refer to	OPERATION"	"E.V. valve	The STP pump stops.	Power cable breakage.
	Section 6.1.1, "Power	"EMERGENCY	OPEN	The E.V. valve functions at	Power cable disconnection
	Failure").	OPERATION"	signal"	approx. 7000 rpm.
				The rotor lands on the touch down
				bearing at approx. 2000 rpm.
Abnormal	Rotor descends onto the	"EMERGENCY	"ALARM"	The E.V. valve is opened.	STP connection cable breakage.
magnetic	touch down bearing.	OPERATION"	"E.V. valve	The STP pump stops.	STP connection cable
bearing			OPEN		disconnection.
			signal"		Abnormal control circuit.
Excessive	Rotor vibration:	"EMERGENCY	"ALARM"	The E.V. valve is opened.	External vibration, and impact.
vibration	100 ￿m p-p or more.	OPERATION"	"E.V. valve	The STP pump stops.	Intrusion of atmospheric air.
			OPEN		Intrusion of foreign materials.
			signal"
Overload of	Current of more than 40A	"FAILURE"	"ALARM"	The inverter stops.	Leakage from the vacuum
inverter	flows into the inverter			The STP pump continues to rotate	equipment or piping.
	momentarily or current of			by inertia.	Insufficient pressure at inlet
	more than 11.5A flows into				and outlet port sides.
	the inverter continuously				Failure of starting of the
	for 15 minutes.				auxiliary pump.

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