American Power Conversion Redundant Switch operation manual

	Troubleshooting
Troubleshooting	With the high availability system, the attached UPSs are polled
communications	continuously for capability to carry a load and ability to
and lost	communicate with the management software (PowerChute
redundancy	plus). When a problem with one of the UPSs occurs, power to
	the load is not interrupted and polling continues, and
	PowerChute plus responds by displaying the message, “Self
	test failed: invalid test.”
	Communications Problems. If the message “Self test failed:
	invalid test.” occurs repeatedly:
	1. Check the communications path between the UPSs and
	the Redundant Switch.
	2. Check the front panel of the Redundant Switch.
	– If the Status Select LEDs are flashing in any sequence,
	the Redundant Switch has failed. See “Basic
	troubleshooting” on page 18.
	– If the front panel appears normal, there may be a UPS
	or server communications problem, See the
	troubleshooting and service sections of your UPS
	manuals.
	– If you need more help, contact APC Worldwide
	Customer Support.
	Loss of Redundancy. If the Redundant Switch LED for UPS-B
	is off, UPS-B has lost the ability to provide power to the
	equipment load when engaged. If the LED for UPS-A is off,
	UPS-A has failed, and power is now provided by UPS-B. See
	the troubleshooting and service sections of your UPS manuals.

If PowerChute plus displays the message “self test failed: invalid test” briefly or several times, the output voltage of UPS-A has dropped. Perform a UPS self-test through PowerChute plus.

•If the self test fails, see the troubleshooting and service sections of your UPS manuals.

•If you need more help, contact APC Worldwide Customer Support.

APC Redundant Switch: Installation and Operation Manual 19