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Installing the Network Gateway Unit (Continued)
NGU Electrical Specifications
NGU Electrical Specifications
Input Rating when used with external PSU:
Input Rating when used with external PSU:
Input voltage:
Input voltage:
Maximum current consumption: 100mA
Maximum current consumption: 100mA
Input Rating when used with PSU3A:
Input Rating when used with PSU3A:
Voltage, frequency:
Voltage, frequency:
Maximum current consumption: 1.6A (Protection by 2A mains supply fuse in terminal block)
Maximum current consumption: 1.6A (Protection by 2A mains supply fuse in terminal block)
Output Rating when used with PSU3A:
Output Rating when used with PSU3A:
Output voltage:
Output voltage:
Maximum output current:
Maximum output current:
Battery Charger Output Ratings (PSU3A):
Battery Charger Output Ratings (PSU3A):
Battery voltage when charged:
Battery voltage when charged:
Temperature compensation:
Temperature compensation:
Battery fuse rating:
Battery fuse rating:
Final end battery voltage:
Final end battery voltage:
Charger ripple voltage:
Charger ripple voltage:
Low Voltage Shut Down
Low Voltage Shut Down
If the battery voltage drops below 21V, then the batteries are disconnected automatically to avoid system
If the battery voltage drops below 21V, then the batteries are disconnected automatically to avoid system
malfunction and deep discharge causing permanent damage. Battery capacity should be selected to ensure
malfunction and deep discharge causing permanent damage. Battery capacity should be selected to ensure
sufficient backup time in the event of mains power failure.
sufficient backup time in the event of mains power failure.
Battery Capacity
Battery Capacity
Sealed valve regulated lead-acid battery types MUST be used. Battery lifetime depends on the ambient
Sealed valve regulated lead-acid battery types MUST be used. Battery lifetime depends on the ambient
temperature. Refer to the battery manufacturer's technical specification for guidance. When using multiple
temperature. Refer to the battery manufacturer's technical specification for guidance. When using multiple
batteries, all batteries should be from the same Manufacturer, of the same type and date code and be mounted
batteries, all batteries should be from the same Manufacturer, of the same type and date code and be mounted
in the same cabinet.
in the same cabinet.
Two 12V batteries must be connected in series.
Two 12V batteries must be connected in series.
22V - 28Vdc
22V - 28Vdc
230Vac, ±15%, 50/60Hz
230Vac, ±15%, 50/60Hz
26V - 28Vdc
26V - 28Vdc
500mA (with battery charger available) or 2A (without
500mA (with battery charger available) or 2A (without
battery charger), dependent upon the fuse fitted
battery charger), dependent upon the fuse fitted
27.3V at 20°C (Charge float voltage)
27.3V at 20°C (Charge float voltage)
-3mV/°C/cell
-3mV/°C/cell
T 6.3A H 250V
T 6.3A H 250V
21V
21V
140mV RMS
140mV RMS
9
997-451, Issue 6 July 2006
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