Bypass procedure SL20KHB2

Test outlet power by switching the unit to manual bypass and breakers off.
If power is supplied OK and the filter board repaired OK then restart the unit starting with the breakers supply to unit,battery confirm the display is on and static bypass led also on then switch back the bypass knob to normal and press the on button to switch the unit to normal.
Give the batteries time to charge 12hours then you can test the unit on backup mode.

You will have very little benefit from a schedule.
All UPS are structured similarly.
A rectifier, an inverter.
A battery charger, a bypass ...

You should start with Rotary switch on "Maintenance Bypass" position and Qf1 open.
Turn Rotary Sw to "Test" position and wait for self test to execute and UPS to turn on.
Once you get the Yellow lamp lit, it is asking for QF1 to close
Once closng QF1, if green LED is lit, turn UPS off by pressing gray button until it ask for confirmation, select Yes and press Return.
Turn Rotary Sw to Normal position, press On button and the green LED will illuminate.
If, after closing QF1, the green LED didn`t lit, turn Rotary Sw to Normal, press On button and wait for green LED to lit.

Thats`it...
if anything is not working well.. please let me know.

Place UPS into internal Bypass (Static Bypass) via the display. Then place unit back to Normal from Internal Bypass(Static Bypass). See if that helps. Or shut the unit down completely by placing UPS into Static Bypass first and then place UPS into external bypass mode, switch is located on the bottom front of the UPS. Please follow the UPS Manual to help you understand the procedures. Also recommend doing this after hours, not during business hours.

Abdul,

What is the fault? Because these systems are somewhat modular it could be something very simple -or- not so much.

Let me know.

Daniel • [email protected] • Power & Systems Innovations • 800.260.2259 • www.psihq.com

Bypass failure is the same as your input unless you have a dual input. You lost power and the UPS did not hold the load because the batteries are bad. Replace the batteries and you will be ok.

The internal automatic battery test is picking up some differences between the actual value of the battery to the mathematical calculation used in the software. Normally if you do a battery impedance test you would find that the batteries would be consistent and therefore replacing the batteries may not be the solution. Once you transfer the UPS on BYPASS and then recycle the power you would clear the alarm. However on the next internal automatic battery you would be getting the same alarm again.

At times this may be a software issue or an SNMP problem. Normally to refresh the battery data for the UPS monitoring software we carry out a battery discharge test. Please consult with the supplier if an annually battery discharge test is mandatory for the battery monitoring circuit to work well. Please let me know of the outcome

First calculate the total load of the UPS and then calculate the total load. One of the Intel Module is Primary and one is Secondary. I can't remember exactly which one is primary. Q1. There will be a LED on the INTELI MODULE flashing RED. That identifies the bad MODULE. Q2. You can remove the MODULE, but I recommend you place the UPS in Static Bypass first through the Display Menu. Also make sure the UPS is in NORMAL MODE or already in STATIC BYPASS, the LED's on the Display should indicate what mode its in. Q3. You can remove the display from the Inteli Module with out harming the load. You just can't do anything with the UPS, as to tell it to Go to Bypass (Static Bypass) or get out of Bypass, check voltages, etc. So order the part first by getting part number on the sticker off the Module, then schedule your shutdown and perform the you maintenance after hours this way you don't affect anything during business. Also don't do the repair on a Friday due to the fact its weekend and APC/Third party UPS companies will charge you a lot to come out in the weekends. FIRST DO THIS PLEASE- GET THE MANUAL FOR THIS UNIT!!!! And READ IT FIRST!! Find in the manual where it walks you through putting the UPS In bypass (Static Bypass). Follow the manual, My way of doing is to READ TWICE, OPERATE UPS ONCE!! This has help me not dump any loads. My suggestion to you is to check if unit is in Bypass (static Bypass due to the faulty module. If it is on Bypass then all you need to do is follow the procedures to place UPS in External Maintenance Bypass. If UPS is in Normal mode but with Alarms and Beeping, then Navigate through the display and find the BYPASS Mode. Then hit enter Yes on the BYPASS MODE, it will ask you again if you want to "Place UPS INTO BYPASS. Hit YES. You will hear it click. Your LED on the display should Light UPS Solid "BYPASS LED ON" AGAIN Please keep referring to the MANUAL. Once your in bypass mode (Static Bypass) then you can operate the External Bypass Switch on the bottom of the UPS. That is the Maintenance Bypass Switch. This isolate the UPS completely and your load never see's the transfer from Static Bypass to External Bypass, Because its a MAKE BEFORE BREAK System. (Make the power before Breaking the Power) Sorry to get down to simple terms, but when I work on a UPS its personal due to the fact you are responsible for the all that is on the OUTPUT of that UPS. Once on External Bypass, You can now do you module swap. Turning the UPS back on, Please follow place UPS back On Line in the UPS Manual. Also in the Diagnostics, off the display of the unit, it also identifies what module is bad including the Power Modules to the Battery Modules.

You definitely want to follow the manual procedure to avoid a possible load loss:

http://powerquality.eaton.com/Products-services/Backup-Power-UPS/9390.aspx?cx=3

9.1.4 Transfer from Normal to Bypass Mode
To transfer the critical load to Bypass mode:
C A U T I O N
In Bypass mode, the critical load is not protected from commercial power interruptions and abnormalities.
1. Press the CONTROLS pushbutton on the main menu bar. The System Controls
screen appears.
2. Press the BYPASS pushbutton on the System Controls menu bar.
The UPS transfers to Bypass mode and the critical load is immediately supplied
by the bypass source. If the bypass source is not available, the power processor
remains on and an alarm sounds.
3. The UPS is now operating in Bypass mode and the BYPASS status indicator is
illuminated.
The power module (PM) status indicates READY. The system is now on bypass
and the UPS power processor remains on.


At this point, you can operate an external bypass switch to get to maintenance bypass if needed.

This an excerpt from the UPS's manual:
The Bypass LED illuminates indicating that the UPS is in bypass mode. Utility power is sent directly to connected equipment during bypass mode operation. Bypass mode operation is the result of an internal UPS fault, an overload condition, or a user initiated command through an accessory. Battery operation is not available when the UPS is in bypass mode.