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3.2.20 USVI (Not for U.S.)

Introduction

An interruptible power supply (USVI) for Hicom 150 E OfficePro consists of the following components (Figure 3-18):

USVI cabinet (room for two battery managers and two battery sets)
Battery manager board (charging and control electronics)
Battery set board (four maintenance-free, 12 V lead storage batteries).

Two fully compatible battery managers from two different manufacturers are used. The two types can be used simultaneously in one USVI cabinet.

The battery manager is connected to the PSUI via a connecting cable. A separate battery manager with a battery set is required for each PSUI. A port for connecting an external charging rectifier or 48 V DC network system is provided on the back of the battery manager.

For information on how to operate the USVI in connection with an external 48 V DC network system and on how to use an uninterruptible power supply provided by the customer, refer to Section 6.1.1.

Part Numbers

USVI cabinet: S30777-U710-X
Connecting cable between PSUI and USVI (battery manager):
C31043-Z1200-B5
Battery manager: S30122-K5083-L302 or S30122-K5083-X302
Battery set: S30122-X5083-X303

Distribution frame (for connecting an existing external battery):
C39165-A7200-B10

Specifications for the USVI

PSUI in normal mode
Input voltage (from PSUI): Approx. 380 Vdc (0.27 A maximum)
Output voltage (charging voltage for batteries): 54 or 55.2 Vdc (1.6 A maximum)
Power failure mode
Input voltage (from battery): 42 V to 56 Vdc
Output voltage (to PSUI): Approx. 340 Vdc (1.1 A maximum)
Battery set rating: 12 Ah or 7 Ah
Bridging time (see page 3-60)

Front and Rear Views of the USV

Figure 3-18 Front and Rear Views of the USVI (Not for U.S.)

 
Batteries manufactured by Sonnenschein and Yuasa require a setting of 2.3 V per cell.  

Calculating the Bridging Time

The bridging time during a power failure depends on the system configuration, the number of analog and/or digital telephones, the uninterruptible power supply connected, and the rating of the batteries.

The consumption values and diagrams below were determined by measuring one board each. The power consumption for the boards in the field may differ slightly from the measured values due to board-specific tolerances.

The following conditions apply for the discharge rates in Figure 3-19:

New batteries
Ambient temperature. Approximately 23 ºC (73 ºF)
(Low temperatures and deviations in temperature reduce capacity.)
Constant load conditions
Charging voltage: 55.2 Vdc

Discharge Rates for Battery Pack: Hicom 150 E OfficePro

Figure 3-19 Discharge Rates for Battery Pack-OfficePro (Not for U.S.)

The bridging time for a system cabinet is determined by adding together all the currents of the boards and the power requirements of the connected telephones (determined based on Figure 3-20).

Battery Current Drain of Telephones

Figure 3-20 Battery Current Drain of Telephones-OfficePro

Formula for Calculating Battery Power Requirements

The bridging time is determined on the basis of Figure 3-19.
 
In the case of multi-cabinet systems, the cabinet with the greatest load determines the overall system bridging time.  
Any additional external loads (such as an NT 1) that are fed by the USVI must be assessed at 0.04 A per Watt for each load.  

Table 3-16 Hicom 150 E OfficePro-Board Power Requirements (Not for U.S.)

Board 
Power
requirements 
CBMOD 
-Q2960- 
0.80 A 
SLA16 
-Q2702- 
0.10 A 
SLMC8 
-Q2911- 
0.10 A 
SLMO24 
-Q2901- 
0.08 A 
STMD8 
-Q2558- 
0.06 A 
TML8W 
-Q626- 
0.04 A 
TMS2 
-Q2915- 
Not yet known 

Sample Calculation (Worst Case System Configuration) for a System Cabinet (Not for U.S.)

Based on the discharge rates in Figure 3-19, the following are the bridging times for the battery packs:

YUASA NP 12 V/12 Ah - Approximately 2 hours 15 minutes
YUASA NP 12 V/7 Ah - Approximately 1 hour 15 minutes

Extending the Bridging Time

The backup time can be doubled by connecting two battery packs in parallel using proper cabling.
 
Caution 
Battery packs connected in parallel must contain batteries of the same type from the same manufacturer.  

Disadvantages:

Longer battery recharging time. (The battery manager must recharge two battery packs. The charging current of the battery manager is divided between the two battery packs.)
One USVI cabinet is required per system cabinet.

Other ways of increasing bridging time are to provide an external power supply of 48 V using a separate charging rectifier with external batteries or to connect the system to an external 48 V DC network system.

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