Radio Modem Box
5 / 29
User Manual
Rev. 1.0 - 24/06/04
4.1 Description of version with external UPS
Both Radio Modem Box and UPS (Uninterruptible Power Supply) unit are powered
from the power mains (220V AC) through the "Mains In" connectors.
The UPS output powers the PTX LCD or SCM-TLC as well as the Radio Modem
Box through the "UPS Out" connectors. This ensures proper operation and alarm
signalling in the event of mains failure.
System runtime depends on UPS capacity and the following specifications must be
complied with in order to ensure correct alarm signalling for 5-7 minutes as a minimum:
TECHNICAL SPECIFICATIONS OF A TYPICAL RVR UPS
Rated capacity (VA)
600
INPUT
Rated voltage
230V
Voltage range
160-290V
Frequency
47/63 Hz autorange
OUTPUT
Rated capacity (VA/W)
600/360
Rated voltage
230V
Voltage in battery mode
230V ± 10%
Waveform
Pseudo-sine waveform
Frequency from battery
50/60 Hz autorange ± 1 Hz
SYSTEM
Operation time
3 ms
AC-AC efficiency
98%
Battery and runtime
Lead battery, maintenance-free, 10 min. runtime at
half load
Protections
Excessive discharge from accumulators,
over-current, short circuit, temperature
There are several different UPS types available in the market to meet specific
application requirements.
-
Stand-by
In normal operation, the system is powered by the mains. In the event of an interruption,
load is switched onto the battery. Proper operation depends on the power mains: if
the power mains is poor quality or is affected by noise, the load will be switched onto
the battery frequently.
-
Active Stand-by
In normal operation, the system is powered by the mains. In the event of an interruption,
load is switched onto the battery. Output voltage is regulated to ensure more efficient
battery usage. Power supply quality in battery mode depends on product
specifications, as certain products provide a sinusoidal signal, whereas other products
provide a pseudo-sinusoidal signal.
