Vertiv™ NetSure™ Control Unit (NCU) User Manual
Auto Equalize looks for two (2) specific conditions for activation.
1. Has the recharge current (provided either by the rectifiers or solar converters) exceeded a User settable Equalize Start
Current value for three (3) minutes or
2. Has the battery capacity decreased to a User settable value.
If either of the above conditions are reached, Auto Equalize activates and the NCU controller tells the rectifiers and solar converters (if
present) to provide their respective output equalize voltages. Auto Equalize will deactivate once the battery recharge current reaches
the Equalize Stop current level and the Equalize Stop Delay has been satisfied. Once equalize has finished, the generator will also
shut off if it is running.
In addition to the automatic features above, this Generator Function will provide a way to manually run the generator when necessary.
Although not necessary for operation, the function will also have the capability for recognizing a digital input signal that can be used
to send feedback to the controller that the generator is running.
See “AC Generator Function:” starting on page 144.
1.3.8 Diesel Management Feature
The Diesel Management feature is available when an SM-AC supervisory module is connected to the NCU. The Diesel Management
feature consists of a Diesel Test. The Diesel Test can be performed at specific intervals or a User can manually start the Diesel Test.
The NCU records the test results.
1.3.9 Hybrid Control Function (Supporting Generator, Solar and Wind Energy Input, and
Optimization)
Hybrid Control is designed for use in new installations or as an upgrade of existing sites powered by a diesel generator(s) when grid
power is not available. The Hybrid control is also applicable to sites with highly unreliable or frequently unavailable grid power
connection. The primary power source is still considered to be the diesel generator(s). Since grid power is always given priority, the
primary power source is still considered to be the grid power.
NOTE!
The Hybrid Control function requires a specific configuration. Hybrid Control menus will not normally be displayed
unless your NCU has been configured by Vertiv for this function. Contact Vertiv for a Hybrid Control configuration.
General
Hybrid Control allows the option of selecting one of the following: Fixed Daily Time based operation or Capacity Discharge based
operation.
Fixed Daily Time based operation is intended to be used with a combination of AC powered active cooling (air conditioners) and DC
powered cooling (heat exchangers, etc.). The cycle period is synchronized to the 24hrs day-night cycle. It makes optimum use of the
different temperature conditions during the day and the night in order to facilitate Hybrid fuel saving operation.
Capacity Discharge based operation is intended for sites utilizing only DC powered cooling (heat exchangers, etc.). The cycle period
is determined by User selectable depth of discharge (DOD) of the batteries per cycle, and associated recharge time. It provides
optimum Hybrid fuel saving operation.
Operation from Grid Power is performed with both Fixed Daily Time and Capacity Discharge modes of operation. Grid power is
always given priority when available.
As the two types of control are specific to the hardware configuration of the site, the Fixed Daily Time or Capacity Discharge is a User
selectable option on installation.
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