TDK 750W HALF RACK technical manual Bit, Service Request Enable and Event Registers

7.11.2Conditional Registers (continued) Table 7-8: Fault Condition Register

BIT	Fault name	Fault symbol	Bit Set condition	Bit Reset condition
0 (LSB)	Spare bit	SPARE	Fixed to zero	Fixed to zero
1	AC Fail	AC	AC fail has occurred.	The AC input returns to normal.
2	Over	OTP	OTP shutdown has	The power supply cools down.
	temperature		occurred.
3	Foldback	FOLD	Foldback shutdown	The supply output is turned On by front
			has occurred	panel button or OUT 1 command.
4	Over volt-	OVP	OVP shutdown has	The supply output is turned ON by
	age		occurred.	front panel button or OUT 1 command.
5	Shut Off	SO	Rear panel J1 “Shut	Rear panel J1 “Shut Off” condition has
			Off” condition has oc-	been removed.
			curred.
6	Output Off	OFF	Front panel OUT but-	The supply output is turned On by front
			ton pressed to Off.	panel button or OUT 1 command.
7(MSB)	Enable	ENA	Rear panel J1 Enable	Rear panel J1 Enable terminals
			terminal (J1-1&J1-14)	closed.
			opened.
Table 7-9: Status Condition Register

BIT	Fault name	Fault symbol	Bit Set condition	Bit Reset condition
0 (LSB)	Constant	CV	Output is On and the	Output is ON and the supply is not in
	Voltage		supply in CV.	CV.
1	Constant	CC	Output is ON and the	Output is ON and the supply is not in
	Current		supply in CC.	CC.
2	No Fault	NFLT	The power supply is	One or more faults are active and fault
			operating normally or	reporting is enabled (using “FENAxx”).
			fault reporting is not
			enabled.
			See “OUT n” com-
			mand in Section 7.7.5.
3	Fault active	FLT	One or more faults	Fault Event Register cleared (FEVE?).
			are enabled and oc-
			cur.
4	Auto-Restart	AST	Supply is in Auto-	Supply is in Safe-Start mode (from
	Enabled		Restart mode (from	Front Panel or serial command).
			Front Panel or serial
			command).
5	Fold	FDE	Fold protection is	Fold protection disabled (from Front
	Enabled		enabled (from Front	Panel or serial command).
			Panel or serial
			command).
6	Spare bit	SPARE	Fixed to zero.	Fixed to zero.
7(MSB)	Local Mode	LCL	Supply in Local mode.	Supply in Remote mode or Local-
				Lockout mode.

7.11.3 Service Request: Enable and Event Registers

The conditional Registers are continuously monitored. When a change is detected in a register bit which is enabled, the power supply will generate an SRQ message.

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83-507-5002 Rev. B