Troubleshooting Redundant Switch

Note:

Only APC Support Personnel should open the Redundant Switch for repair.

Problem	Possible Cause	Corrective Action

Redundant Switch will not turn on.	Very low or no utility voltage.	Check the AC power supply to the Redundant
		Switch with a table lamp. If very dim, have the
		utility voltage checked.
		Check that AC plugs are properly connected
		between Redundant Switch and the UPSs.

Server cannot communicate with	Cabling problem or internal	Check the cable connections. If they are tight and
attached UPS through Redundant Switch.	Redundant Switch fault.	there is still no communication, connect the
		server directly to a UPS. If there is now
		communication, there is an internal Redundant
		Switch fault. In any case, Contact APC customer
		service (see Service section).

All Redundant Switch LEDs are flashing.	Internal, automated self-test failure:	See Service section, below.
	defective unit

For Computer	Interface Port Specifications, see the APC Website (www.apcc.com).

Troubleshooting the High Availability System

With the High Availability System, the attached UPSs are polled continuously for capability to carry a load and ability to communicate with the management software (PowerChute plus®). When a problem with one of the UPSs in the High Availability System occurs, the load is not interrupted and polling continues, but PowerChute plus® is alerted immediately.

PowerChute plus® responds by displaying the message: “self test failed: invalid test”.

Communications Problems

If there is a communications problem with either UPS; i.e., the above message is reported continually, first diagnose the communications path between the UPSs and the Redundant Switch. If the communications path appears to be good, check the front panel of the Redundant Switch. If the Status Select LEDs are flashing in any sequence, the Redundant Switch has failed. In this case, troubleshoot the Redundant Switch using the Troubleshooting instructions above. If you need further assistance, follow the instructions in the Service section below.

If this is a UPS or server communications problem, the front panel may look normal. In this case, troubleshoot the UPS using the Troubleshooting instructions in the Smart-UPS Quick Reference Guide included with the UPSs. If you need further assistance, follow the instructions in the Service section of the User’s Manual.

Loss of Redundancy Problems

If the Redundant Switch LED for UPS-B is dark, UPS-B has lost the ability to deliver a load when engaged. Similarly, if the LED for UPS-A is dark, it has failed and power is now coming from UPS-B. Troubleshoot the UPS using the Troubleshooting instructions in the Smart-UPS Quick Reference Guide included with the UPSs. If you need further assistance, follow the instructions in the Service section of the User’s Manual.

If PowerChute plus® displays the message “self test failed: invalid test” for a short time or several times. UPS-A has dropped output voltage. Initiate a self test through PowerChute plus®. If the self test fails, troubleshoot the UPS using the Troubleshooting instructions in the Smart-UPS Quick Reference Guide included with the UPSs. If you need further assistance, follow the instructions in the Service section of the User’s Manual.

990-0253A, Revision 2 6/99

SU042-1 3000 VA, SU42-2 3000 VA, SU041 1400 VA, SU043 1400 VA specifications

The APC SU042-1, SU043, SU041, and SU42-2 are reliable uninterruptible power supply (UPS) systems designed to provide consistent power protection for essential electronic equipment. This range of UPS models is ideal for homes, small offices, and critical servers, ensuring peace of mind through a reliable power backup solution.

The APC SU042-1 is a high-capacity 3000 VA model that combines robust performance with smart technologies. It is equipped with a pure sine wave output, ensuring that sensitive electronics, such as servers and networking equipment, receive clean and stable power. With a compact design, this UPS easily fits into various environments while providing extended runtime options through additional battery packs. The LCD display offers real-time information on battery status, load, and input/output voltage, allowing for quick monitoring and management.

In the mid-range category, the APC SU043 and SU041 models stand out with their 1400 VA capacity. These units are perfect for desktop setups and small servers, offering essential features to protect equipment from power disturbances. Both models feature automatic voltage regulation (AVR), which stabilizes incoming voltage and minimizes the risk of damage from power surges. They also come with multiple output sockets, accommodating a variety of devices while ensuring maximum efficiency.

The SU42-2, another 3000 VA model, provides a higher capacity for businesses looking to safeguard critical infrastructure. Similar to the SU042-1, this unit boasts pure sine wave output and advanced LCD displays for monitoring. Additionally, the SU42-2 features customizable settings that allow users to tailor performance based on specific power needs, such as setting alarms and adjusting sensitivity to voltage fluctuations.

All four models utilize advanced battery management systems to enhance battery life and performance. User-friendly, they come with USB and serial connectivity options, allowing seamless integration with network monitoring software, enabling administrators to manage and monitor power status remotely. In conclusion, the APC SU042-1, SU043, SU041, and SU42-2 UPS models represent a versatile range of solutions designed to protect vital equipment against power disturbances, making them an essential investment for anyone reliant on a steady power supply.