APC VS 100, VS 50 Load Management, System Current Monitor, System Status and Alarm Reporting

System Current Monitor

The controller monitors individual rectifier currents and displays total system current as a sum of rectifier currents. Load current can be found by adding battery current to system current. Battery Current is positive when the battery is discharging.

Sys Current + Batt current = Load Current

For example, if the battery is charging the Batt Current reading could be (–) 10 A, Sys Current reading could be 50 A. Load Current would be:

Sys Current + Batt current = Load Current 50 A + (-) 10 A = 40 A.

If the battery is discharging the Batt Current reading could be 10 A, Sys Current reading could be 30 A. Load current would be:

Sys Current + Batt current = Load Current 30 A + 10 A = 40 A.

System Status and Alarm Reporting

The controller will monitor system, temperature. The controller reports system high and low temperature alarms.

5.3. Load Management

Circuit Breakers

Distribution is included for up to 2 circuit breakers or eight GMT fuses per 50-A shelf. The circuit breakers can be 2 X 30 A or 1 X 60 A in each shelf. The GMT fuses are 8 X ¼ to 15 A in each shelf. When a circuit breaker trips, a normally open switch closes and the controller reports a CB alarm. Alarms are reported only when a breaker is tripped. When a breaker is turned off, no alarm is generated. Circuit Breaker Alm 1 or 2 are reported when a circuit breaker in the top shelf trips. Circuit Breaker Alm 3 or 4 are reported when a circuit breaker in the bottom shelf trips. Because of this, if a Magnum VS 100 has GMT fuses in the top shelf and 2 circuit breakers in the bottom shelf, the circuit breakers will be labeled CB1 & CB2 on the front panel, but Circuit Breaker Alarm 3 & 4 will be reported. If a Magnum VS 100 has GMT fuses in the top shelf and 1 circuit breaker in the bottom shelf, the circuit breaker will be labeled CB1 on the front panel, Circuit Breaker Alarm 3 will be reported. If a Magnum VS 100 has 1 circuit breaker in the top shelf and 1 circuit breaker in the bottom shelf, the circuit breakers in the bottom shelf will be labeled CB2 on the front panel, but Circuit Breaker Alarm 3 will be reported. To disconnect a load attached to a circuit breaker, move the lever down to the “OFF” position.

Magnum VS –48 Vdc User’s Manual Page 21