Minuteman UPS MBK-E SERIES user manual Symptom Possible Cause What To Do

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Symptom	Possible Cause	What To Do
UPS will not turn on	On/Off/Test button not	Press and release the On/Off/
	pushed	Test button to start UPS
UPS operates in	Input AC circuit breaker is	Reset circuit breaker by
battery mode only,	tripped	pressing the plunger back in.
even though there is		If the AC circuit breaker trips
normal AC present		after UPS starts up, reduce
		the load on the UPS
Fault LED is	UPS has detected an	Call for service
illuminated	internal fault
Site Wiring Fault	Incorrect service wiring	Have a Qualified Electrician
LED is illuminated		correct the service wiring
The On-line/On-	The UPS is being	Disconnect the computer
Battery LED is	controlled via its	cable from the UPS and press
illuminated, but	communications port	the On button. If UPS works
there is no output		normally, the software has
		control of the UPS
UPS does not	The batteries may be weak	Charge the batteries for 8
provide expected	or at the end of useful	hours and retest. If the runtime
runtime	service life	is still less than expected, the
		batteries may need to be
		replaced, even though the
		Weak/Bad Battery LED is not
		illuminated
Weak/Bad Battery	Weak/bad batteries or bad	Check battery connections,
LED is illuminated	connections at the battery	charge the batteries for 8
		hours, replace the batteries
UPS occasionally	Normal operation	The UPS is performing its
emits a beep		intended function
Overload LED is	The load has exceeded the	Check the specifications (see
illuminated and a	UPS's capacity	section 8). Remove part of the
constant alarm		load
The On-Line LED is	The UPS is in the Boost	The UPS is performing its
blinking and the au-	mode	intended function
dible alarm is silent

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