Vertiv™ NetSure™ Control Unit (NCU) User Manual
1.3.5 Energy Management
Energy Management consists of an Energy Optimization Mode.
Energy Optimization Mode
The NCU provides an Energy Optimization Mode (ECO) function. Energy Optimization permits an installation to only operate
rectifiers as needed to maintain the load and keep batteries in a fully charged condition. As load increases, Energy Optimization turns
on additional rectifiers as needed to maintain the load. As load decreases, Energy Optimization places rectifiers in standby to
conserve energy usage. Rectifiers which are always operating to maintain any load requirements are cycled through the group of
rectifiers controlled by this feature to provide uniform operating times for each rectifier.
ALERT! The Energy Optimization Mode should NOT be used in systems that operate without batteries.
NOTE!
If the battery is ever disconnected, disable Energy Optimization Mode until the battery is reconnected.
The following operating conditions apply:
1. The ECO mode is only enabled upon normal system operation. If any of the following alarms occurs, the system cannot enter
or will exit the ECO mode.
a) Current imbalance (only when imbalance current protection is enabled).
b) AC fail.
c) Any one rectifier over temp.
d) Any one rectifier AC fail.
e) Any one rectifier fault.
f) Any one rectifier over voltage.
g) Any one rectifier fan fault.
h) Any one rectifier no response.
i) Any one battery fuse open.
j) Any one LVD disconnect.
k) Battery is in charge or discharge, as defined below:
- Battery current > [battery rated capacity × 0.005], or battery current > 5A means battery in charge.
- Battery current < [battery rated capacity × -0.003], or battery current < -2A means battery in discharge.
l) Under voltage.
m) Any one rectifier in current limit mode.
2. The system load cannot exceed the system energy saving point (default value is 45%). Otherwise the system cannot enter or
will exit the ECO mode.
3. When the rectifier load exceeds its optimal operating point, the system will exit the ECO mode and the controller will
recalculate and then turn off any unnecessary rectifiers. After that, the system can enter the ECO mode again.
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