Tescom T-300P Series, User Manual, Page: 23 / 45

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3.2.3 Hot Standby Mode
If current sharing is active, two UPS’s are operating continuously and lifetime of some parts will be shorten. Hot
standby mode is a solution for increased UPS lifetime.
In this mode, UPS 1 supplies the load and the UPS 2 waits as spare. It is in standby mode but it is ready to work.
If a failure occurs in UPS 1, static switch system will isolate UPS 1 from the load and activates the UPS 2. This is a
very fast response; the load doesn’t sense the replacement.
Current sharing is not active in this mode.
In this mode, on the LCD panel of both UPS’s you will see the message “HOT STANDBY”.
3.3 Parallel Operation Mode Fault Codes
FAULT
DESCRIPTION
A23 MODE FAILURE
SLAVE ups search for the same operating mode with MASTER UPS, if they are
different this message locates on LCD panel.
Change the operation mode of SLAVE ups from SETTINGS MENU.
Don’t forget to press ENTER key for 3 seconds
Turn off the SLAVE UPS and turn on again.
A24 P.FAILURE 17 Parallel Controller Board Failure
A25 P.FAILURE 18 Parallel Controller Board Failure
A26 P.FAILURE 19 Parallel Controller Board Failure
A27 P.FAILURE 20 Parallel Controller Board Failure
A28 P.FAILURE 21 Parallel Controller Board Failure
A29 P.TEST MODE Parallel control board is in test position
A30 P FAILURE 23 Parallel Controller Board Failure
A31 DUBL UPS NR.
The same UPS number is selected for SLAVE UPS. You must give separate UPS
number to each UPS in parallel system.
Goto SETTINGS MENU and change UPS number.
Don’t forget to press ENTER key for 3 seconds.
Turn off the SLAVE UPS and turn it on again.
A40 CANT FIND PR
Parallel mode is selected but main controller could not find parallel control board.
Select ONLINE mode from SETTING MENU.
Turn off the UPS and turn it on again.
A41 P.BAL.FAILURE Current sharing failed in parallel operation. After a delay sharing will be tried again.
A43 P.SYNC.FAIL
In parallel system SLAVE UPS is not synchronized to MASTER UPS
After a delay SLAVE UPS will try to be syncron again.
A48 STATIC BYP In parallel system static bypass switch (S6) is in “ON” position.
3.4 Parallel System Accessories
At standart T300P series there is no installed parallel components but they can install. For parallel operation the
following parts are necessary:
•
Parallel control board
•
Current transformers
•
Digital connection cable
•
Analog connection cable
•
Fully static bypass system
During order, the customer should give information about any options and accessories, to factory.