APC Smart-UPS VT 400 Technical Information download pdf (Page 21)

Operation – Parallel System

990-2282C-001 Smart-UPS® VT 10-40 kVA 400V, 208V, 200V – Operation 15

 From the external MBP: Check that all the output lamps (H2) at Q2 are lit.

 From the external MBP: Turn all output switches (

Q2) to position “O” (OFF).

 From the external MBP: Turn all input switches (

Q5) (if available) to position “O” (OFF).

 From the external MBP: Turn all input switches (

Q1) to position “O” (OFF).

 From the XR Enclosure(s) (if available): Set the DC disconnect switch(es) to position

OFF.

 From the UPS: Disconnect the batteries by pulling them out to the red disconnect line shown on

each battery unit.

 From the XR Enclosure(s) (if available): Disconnect the batteries by pulling them out to the red

disconnect line shown on each battery unit.

How to turn into normal operation from external maintenance bypass

Caution: Never attempt to turn the UPS into normal operation till you have verified that there

are no intenal UPS faults.



If the UPS units have been completely turned OFF, proceed with steps 2–16. If the UPS units have

not been completely turned

OFF, proceed with step 13–16.



From the UPS: Connect the batteries in each UPS by pushing them in.



From the XR Enclosure(s) (if available): Connect the batteries in each UPS by pushing them in.



From the XR Enclosure(s) (if available): Set the DC disconnect switch(es) to position ON.



From the external MBP: Turn all input switches (Q1) to position “|” (ON).



From the external MBP: Check that all the input lamps (H5) at Q5 (if available) are lit.



From the external MBP: Turn all input switches (Q5) (if available) to position “|” (ON).



From the external MBP: Check that all the output lamps (H2) at Q2 are lit.



From the external MBP: Turn all output switches (Q2) to position “|” (ON). The lamp indicator of the

output isolation breaker

(Q4) is still lit.



From the UPS: Turn ON all UPS units from each display via Control–Turn Load ON–Yes, Turn

Load ON. The green online LEDs are lit on each UPS unit.



From the external MBP: Check that all the output lamps (H2) at Q2 are unlit and that all the input

lamps (

H5) at Q5 (if available) are unlit (continues on the next page).

 From the UPS: Turn the UPS units into bypass from one UPS display via Control–UPS into

bypass–Yes, UPS into bypass. Check that the UPS units are in bypass. The green (

LOAD ON) and

the yellow (

BYPASS) LEDs are lit.

 From the external MBP: Check that the lamp indicator of the output isolation breaker (

H4) is lit.

 From the external MBP: Turn the output isolation breaker (

Q4) to position “|” (ON). Now the lamps

H3 + H4 are lit.

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APC Smart-UPS VT 400 Technical Information Page 21

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