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6. Special Function
The series UPS has some special functions, which could satisfy some
special application of user. And the functions have own features,
please contact your local distributor for further information before
using the function.
6.1 HE Function
6.1.1 Brief Introduction of HE Function
If HE function is set to enable, after the UPS is turned on, the power
used by the load is directly supplied from the utility power via internal
filter while the utility power is in normal range, so the high efficiency
could be gained in HE mode. It is also called economy mode. Once the
mains is loss or abnormal, the UPS would transfer to Line mode or
Battery mode and the load is supplied continuously.
The great virtue is overall high efficiency >0.97 of UPS, to save power
for user.
But the disadvantage is 1) the load can not be protected as well as in
Line mode, for the load is directly supplied from the utility; 2) the
transfer time of UPS output from HE mode to Battery mode is about
10ms.
So the function is not suitable to some sensitive loads, and the region
where the utility power is unstable.
6.2 Converter Function
6.2.1 Brief introduction of Converter function
In converter mode, the UPS would free run with fixed output
frequency (50Hz or 60Hz). Once the mains is loss or abnormal, the
UPS would transfer to Battery mode and the load is supplied
continuously.
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The great virtue is the output frequency is fixed, which is required by
some very sensitive loads.
But the load should be derated to 60% when running in converter
mode with single phase input, and there is no derating with three
phases input.
6.3 Parallel Function
6.3.1 Brief introduction of the redundancy
N+X is currently the most reliable power supply structure. N
represents the minimum UPS number that the total load needs, X
represents the redundant UPS number, i.e. the fault UPS number that
the system can handle simultaneously. When the X is larger, the
reliability of the power system is higher. For occasions where reliability
is highly depended on, N+X is the optimal mode.
As long as the UPS is equipped with parallel cables, up to 4 UPSs can
be connected in parallel to realize output power sharing and power
redundancy.
6.3.2 Parallel installation and operation
How to install a new parallel UPS system:
1)
Before installing a new parallel UPS system, user need to prepare
the input and output wires, the output breaker, and the parallel
cable.
2)
Users need to use a standard 25-pin communication cable, which
should have 25 cores, corresponding stitches and shield, as the
UPS parallel cable. The length of the parallel cable is appropriate to
be less than 3m. And there is one standard parallel cable in the
accessories of every UPS.
3)
Remove the cover plate of the parallel port on the UPS, connect
each UPS one by one with the parallel cable, and re-screw the
Parallel port cover which is supplied in the accessories.
