TDK 750W HALF RACK technical manual Oup

SYMPTOM	CHECK	ACTION	REF
Output is present	Is the power supply	Check if the positive or	3.9.6
momentarily but shuts off	configured to Remote	negative load wire is loose.	3.9.8
quickly.The display indicates	sense?
“OUP”.
Output Voltage will not	Is the unit in constant	Check Output Current	5.2.1
adjust. Front panel CC LED	current mode?	setting and load current.	5.2.2
is On.
Output Voltage will not	Check if output voltage is	Set OVP or UVL so they will	5.3
adjust Front panel CV Led is	adjusted above OVP	not limit the output.	5.4
On.	setting or below UVL
	setting.
Output Current will not	Is the unit in constant	Check Output Current and	5.2
adjust. Front panel CV LED	voltage mode?	voltage setting
is on.
Large ripple present in	Is the power supply in	Check load and sense wires	3.9.4
output.	remote sense?	connection for noise and	3.9.8
	Is the voltage drop on the	impedance effects. Minimize
	load wire high?	the drop on the load wires.
No output. Display indicates	Overvoltage Protection	Turn off the AC power	5.3
“OUP”	circuit is tripped.	switch. Check load
		connections. If Analog
		Programming is used, check
		if the OVP is set lower than
		the output.
No output. Front panel	Display indicates “ENA”	Check rear panel J1	5.8
ALARM LED is blinking.		ENABLE connection.
		Setup switch SW1 setting.	4.4
	Display indicates “SO”	Check rear panel J1 Output	5.7
		Shut-Off connection.
	Display indicates “OTP”	Check if air intake or
		exhaust are blocked. Check
		if the unit is installed
		adjacent to heat generating
		equipment.
	Display indicates “Fb”	Check Foldback setting and	5.5
		load current.
Poor Load regulation.	Are sensing wires	Connect the sense wires	3.9.8
Front panel CV LED is on.	connected properly?	according to User’s Manual
		instructions.
The front panel controls are	Is the power supply in	Turn Off the AC power and	7.2.5
non-functional.	Local-Lockout mode?	wait until the display turns
		off. Turn on the AC power
		and press front panel
		REM/LOC button.

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83-507-5002 Rev. B