Tescom T-3250, User Manual

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III. PARALLEL OPERATION
3.1 Introduction
Two of T-300P UPS can be used in parallel mode, the purpose of parallel use:
•
Increasing security
•
Redundancy
•
Power increment purpose
3.1.1 Security
At stand alone UPS systems mains voltage is spare energy in case of UPS failure, but some critical loads don’t
works with mains tolerances. Cause of this a second spare UPS is a better solution.
3.1.2 Redundancy
UPS designs are perfect but they takes all mains risks, sometimes some failures is possible, the lifetime of
batteries and some parts is limited. In such a case the second UPS installed on system will be work on.
3.1.3 Power Increment
Some load systems always develops and the power need increases, the cheepest solution is to install one more
UPS to the system.
3.2 Parallel Operation Modes
NOTE:
Parallel control board and some accessories are not installed to standart T-300P series UPS, but
parallel operation is available at this models.
Parallel operation is in 3 modes:
•
SYMETRIC PARALLEL operation
•
REDUNDANT parallel operation
•
HOT STANDBY operation
User can select one of the operation modes according to purpose. If parallel control board is installed to UPS
You can select operation mode from SETTINGS MENU, in this chapter you can find parallel operation mode
informations.
3.4.1 Symetric Parallel Mode
On UPS panel shortly PARALLEL MODE word is used. This mode is usefull at power increment, mains power is
spare energy, in case of UPS failure static bypass sytem of all UPS go to bypass together. And if everything is
okay go to inverter together.
Current sharing is active, current is %50-50 shared two UPS. During bypass sharing is active.