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3.2.1 Redundant Parallel Mode
At this mode if one of the UPS’s fails the other UPS continues to supply the load.
Assume that UPS1 on figure 3-1 is failed, SB1 and SB2 static switches will turn off and the UPS 1 is isolated
from load. The SB4 static switch of the UPS 2 will stay in conducted position and it continues to supply the
load.
If UPS 1 is okay after a delay this UPS will join the system.
If two UPS’s are in failure SB1 and SB3 static switches will turn on and load is transferred to bypass
This is a 3 level redundancy UPS1+UPS2, UPS2, mains
Current sharing is active in this mode.
In this mode the power of load must be lower than 1 UPS power.
3.3 Parallel Operation Mode Fault Codes
A23 MODE FAILURE
The modes of the two UPS’s are different, change the modes.
The SLAVE UPS always requires to be in the same mode with MASTER UPS.
Change the mode of SLAVE UPS to be the same as the MASTER’s mode.
Do not forget to press ENTER key.
Turn off the SLAVE UPS and then turn on.
A24 P.FAILURE 10
RS485 failure between parallel UPS’s.
A25 PAR. PSP. FAIL
Parallel board failure.
A26 4 CABLE FAIL
Parallel digital cable failure.
A27 P.FAILURE 13
Another ON-LINE UPS exists.
A28 PLUG IN DIG
Socket unplugged,
A31 DUBL UPS NR.
The same UPS number is selected for SLAVE UPS, you must assign different
UPS numbers to each one in parallel systems.
Go to SETTINGS menu and change the UPS number.
Do not forget to press ENTER key.
Turn off the SLAVE UPS and then turn on.
A40 CANT FIND PR
Parallel mode was selected from the front panel but the main controller couldn’t
find parallel control board.
Select ONLINE mode from SETTINGS menu (ENTER key for 3 Sec.)
Turn off then on.
A41 P.BAL.FAILURE
Current sharing failed in parallel operation.
A43 P.SYNC.FAIL
In parallel system SLAVE UPS is not synchronized to MASTER UPS
3.4 Parallel System Accessories
At standard HP-200P series there is no installed parallel components but they can install. For parallel
operation the following parts are necessary:
•
Parallel control board
•
Digital connection cable (PCC04)
•
Parallel interface board
During order, the customer should give information about any options and accessories, to factory.
IMPORTANT NOTE: Parallel system installation is much more complex from stand-alone UPS installation, it
needs qualified service personnel.
You have to keep 2 m distance between two UPS’s for service purposes.
Add 20% tolerance to power cable sizes, fuses and circuit breakers in parallel connection.
In figure 3-2, the connections of 2 parallel UPS’s and load distribution panel are shown.
