APC MX06 50 User Manual download pdf (Page 23)

MX06 Power Plant User’s Manual Page 19

User Inputs

t) Temperature Probe: Provides input for battery voltage temperature compensation. This

feature operates only when the probe is attached.

u) User Alarm Inputs: Four inputs are provided for user alarm inputs. The inputs are

designed for isolated contacts tied from the alarm input to a corresponding “-BAT” pin on

the same connector. The input can be defined as “Normally Open” or “Normally Closed”

through dipswitch settings on Control Board (Factory default: Normally open).

4.3. Load Management

Distribution is included for up to 2 circuit breakers or 12 GMT fuses per 50 Amp shelf. The

circuit breakers can be 2 X 30 Amps or 1 X 60 Amps in each shelf. The GMT fuses are 8 X ¼ to

15 Amps in each shelf. When a circuit breaker trips, a normally open switch closes and the

controller reports a CB alarm. Alarms are reported when a breaker is tripped or is manually

turned off.

When a GMT fuse trips, a fuse element burns out allowing the indicator to connect DC power to

the alarm contact and the controller reports a fuse alarm.

4.4. Battery Management

Battery Charging

Battery charging and protection are integrated into the DC power system to support the primary

function of providing power to the load.

Battery Temperature Compensation

The Battery Float Voltage is based on the value recommended by the battery manufacturer in

order to maintain correct battery charge at 25ºC. As temperature rises, electrochemical activity

in a battery increases. Similarly, as temperature falls, electrochemical activity in a battery

decreases. As temperature rises, charging voltage should be reduced to prevent overcharge

and increased as temperature falls to prevent undercharge. The DC power system uses Battery

Temperature compensation to change output voltage to compensate for temperature changes.

The circuitry is designed to produce a temperature compensation slope of -3.1 mV / °C / cell,

(-1.7 mV / °F / cell) which is typical for most lead acid batteries used for industrial purposes.

The operational range on the compensation circuit is from about 4 °F to about 150 °F. Below 2

to 4 °F, the probe detection circuit is non-operational and the float voltage goes to the value set

for 25 °C (77 °F).

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APC MX06 50 User Manual Page 23