Nautel XR6, Preinstallation Manual

Page: 40 / 90

XR6/XR3 Pre-installation Manual Electrical requirements
Page 5-2 Issue 3.0 2009-07-15
Voltage stability
The ac power source nominal voltage must be stable to within plus or minus 10% under all loading
conditions. The transmitter contains circuitry that maintains the RF output at the preset carrier level
for voltage variations within the specified range, provided the correct transformer tap is chosen.
Power consumption
When operating at 6 kW (XR6) or 3 kW (XR3) with 100% modulation by a continuous sine wave,
power consumption is approximately 10.8 kW (XR6) or 5.4 kW (XR3). When operating at 6 kW
(XR6) or 3 kW (XR3) with no modulation, power consumption is 7.2 kW (XR6) or 3.6 kW (XR3).
Power consumption for a specific station will depend on the programming format and the level of
audio processing. Nautel recommends the ac power source have a 25% over-capacity to ensure
adequate regulation.
Ac power switch
Install an external ac power disconnect between the ac power source and the transmitter. (Nautel can
provide a suitable ac power disconnect, if required.) For safety, place the ac disconnect close to the
transmitter and label it
TRANSMITTER EMERGENCY ON/OFF SWITCH
.
Ac transient power protection
Protect all conductors from the ac power source by connecting bi-directional surge protection
devices between each conductor and the station reference ground. In addition, pass all the
conductors, as a group, through a ferrite toroid. Install a ferrite toroid on the ac feed between the
transmitter and the bi-directional surge protector.)
• The ferrite toroid included in the ancillary kit, provided by Nautel with the transmitter, can
be used for most ac supply cables. For larger diameters, contact Nautel support for recom-
mendations (see
page 11-3 ), or consult additional, outside suppliers.
Table 5.2: Voltage Stability
Ac Power
Source
Transformer Voltage Range
Minimum Maximum
3-phase LV 188 263
HV 325 459
1-phase - 180 286