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User Manual 10H52267UM60 - Rev. 1 - 09/2018
EXS
Frequency converter mode
The UPS may be operated as a frequency converter, providing a stable output at a frequency of 50 or 60 Hz. The input
frequency may vary between 40Hz and 70Hz. If this operating mode is selected, the maintenance bypass switch is
opened in order to disable bypass operation, while the battery is used only if it is necessary to operate the UPS in
battery mode.
LBS mode
A dual bus system consists of two independent UPS systems, each containing one or more parallel UPS modules. The
dual bus system provides high reliability, which makes it suitable for use with loads having multiple input terminals. In
the case of single-input loads, an STS may be installed to power the load. For the LBS mode operation principle
diagram, see Figure 6-5 and Figure 6-6.
1.5
Battery Management
The following battery management functions are set-up by the service engineer using the Vertiv configuration
software.
1.5.1
Normal Function
1. Constant current boost charge
Uses a constant current (within battery charging limit) to charge the battery. This function can be used for fast battery
capacity recovery. It is also possible to set-up the charging current.
2. Constant voltage boost charge
Uses a constant voltage to charge the battery. This function can be used for fast battery capacity recovery. In the case
of VRLA batteries, the maximum boost charge voltage should not exceed 2.4V/cell.
3. Float charge
This charging method is used for maintaining the battery at full capacity. The float charge voltage is generally low. This
function can be used to compensate for capacity loss due to battery self-discharging, and to recover battery capacity.
In the case of VRLA batteries, the float charge voltage should be between 2.2V/cell and 2.3V/cell.
4. Automatic transfer to float charge
When the charge current is less than the 'Threshold of Equalize Charge to Float Charge’ value, or 0.5 A, the charger will
transfer automatically from boost charge to float charge. When the boost charge time exceeds the 'Equalize Charge
Protect Time Limit', the charger will be forcibly transferred to float charge in order to protect the battery.
5. Float charge temperature compensation (optional)
This function must be used together with the battery temperature detection device. The VERTIV battery temperature
sensor is a standard option.
6. EOD protection
When the battery voltage falls to the EOD level, the the battery converter shuts down automatically and the battery is
inhibited in order to avoid further battery discharge. The EOD voltage may be set to between 1.60V/cell and 1.90V/cell
(VRLA).
7. Battery low pre-warning time
The battery low pre-warning time may be set to between 3min and 60min. The default setting is 5min.
8. Maximum battery discharge time
When the battery is discharged at low current levels for extended periods, it will result in excessive discharge and may
even cause irreparable damage, for this reason it is essential to set-up a maximum battery discharge time in order to
protect it. The time limit value is set-up by the service engineer using the VERTIV setting software.
9. Maximum boost charge protection time
To protect against the battery overcharge damage caused by long time boost charge, it is essential to set-up a
protection time a protect time limit The time limit value is set-up by the service engineer using the VERTIV setting
software.
