SMT1500RM2U - Output Off by: Local Display

[JAUMBSOP]

We have a SMT1500RM2U in a rack of AV gear.  On power-up, the unit fires up, shows battery at 100%, and as load goes up to 10%, the unit shuts off with the message "Output Off by: Local Display".

This UPS is not connected to a network switch and doesn't seem to have any other method to connect for diags.  I went through all menus and all health/operating conditions show as normal.  Health is good on the battery.  I don't see anywhere in the menu to access logs, but will be glad to provide if someone can point me in the right direction to access/export them.

Thanks.

[Teken]

I’m not quite sure what you’re saying so will make a few assumptions. Either you’re saying the unit was operating just fine and now the unit turns off the outputs when there is ONLY 10% connected load?!?

If so remove all connected loads from the unit. Use the LCD to confirm the output state of on / off. If it’s off turn it back on and confirm it remains on and the system doesn’t change state or declare a fault.

If the output was (On) cycle the output from On-Off-On and observe how the system operates. If there are no active faults displayed on the LCD and it doesn’t turn off the outputs.

Your next step is to complete a static test of the UPS. Remove AC Mains from the wall. Disconnect the battery cartridge. 

Wait 30 seconds and reconnect everything besides the loads. Let the unit complete its self test which should pass. If  it does confirm what the output state is from on vs off.

If the output is off you need to program the unit to restore the output to (On) when AC Mains is restored. This is easier done using Power Chute Business Edition software (PCBE) via USB or through the network if a NMC if present. 

Regardless, once you have confirmed the output is programmed to come on or (IF) it’s already programmed to be on. The next step is to complete a dynamic tests to see how the unit behaves.

Remove AC Mains from the wall outlet. Does the unit beep and declare a loss of power? Does it continue to operate fine on battery? If no call out what happens and the active faults / errors. 

If the battery is weak or bad the unit will shut down immediately or offer a very short runtime. Assuming it’s not the battery and it operates fine and the output remains on.

Move forward to connecting the loads. Repeat the dynamic load test and observe what happens to the unit and output when AC Mains is again removed than restored. 

Logs: You can use the LCD to view the past faults / errors. Best to have PCBE connected via USB to record, track, and view live conditions of the system. 

You may have to enable the (Advanced View) for some options to be seen on the LCD. 👍

Report back what you see and observe.