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| Off-line UPS |
| A UPS type which feeds power to the load directly
from the utility and then transfers to battery power via an
inverter after utility drops below a specified voltage. The
delay between utility power loss and inverter startup can be
long enough to disrupt the operation of some sensitive loads.
Also called a standby UPS. |
| Online UPS |
| A UPS in which the inverter is on during normal
operating conditions supplying conditioned power to the load
through an inverter or converter that constantly controls the
AC output of the UPS regardless of the utility line input. In
the event of a utility power failure, there is no delay or transfer
time to backup power. |
| Outlet |
| Any point on a wiring system where current is
taken to supply electrical power for a load.] |
| Output Enable Delay |
| The delay between the start of primary side switching
and the start of output current walk in. this is in two part:
a fixed hardware delay controlled by the secondary side control
circuits and an adjustable delay controlled by the microprocessor.
During this period the output voltage is at the minimum off
approximately 40 V. |
| Overload |
| A condition in which the load wants more from
the power source (such as a UPS) than the power source has been
designed to supply. |
| Over voltage Shutdown ( OVSD) |
| A protection method that will shutdown any rectifier
module with an output voltage over a preset maximum value. |
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| Parallel Online UPS |
| Online UPS technology that provides redundant
sources of conditioned backup power so that the critical load
is protected even in the event of UPS component failure. |
| Parameter |
| A configuration value that the user can set in
the SM50 configuration database. This value is stored in non-volatile
Flash memory. For example: System Float Voltage. |
| Power Factor (PF) |
| The ration of total real power, (W) to the total
apparent power in volt-amperes (VA) ; W/VA. |
| Power Management Software |
| Provides monitoring and shutdown for UPS and connected
load. |
| Power System |
| A rack module, single rack or several parallel
connected racks, providing DC power to a single DC bus. |
| Preset System Voltage |
| The preset voltage is normally defined by the
customer according to the nominal system voltage and the ambient
temperature of the battery. This is the output voltage the rectifier
uses in the event of a communications failure with the SM50.
It is set to the system voltage specified by the customer during
systems final test but may be changed via the SM50 or the rectifier
front panel (if fitted) |
| Preset Voltage |
| The voltage that a rectifier will default to if
communications with the Supervisory Module is lost. Generally,
this is set to the float voltage by the Supervisory Module. |
| PSTN |
| Public Switched Telephone Network |
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