*
In any system, prevent hot exhaust air from recirculating to the air inlet,
otherwise the inlet air temperature will increase, resulting in potential thermal
runaway. This is a prime consideration when designing common ducting
systems for multiple amplifiers.
3.3.4
Commissioning the Installation
When commissioning the installation, the temperature difference across each
amplifier should be checked to assess the suitability of the cooling system.
Temperature measurements should be taken as follows:
*
Under the worst case operating conditions; with the amplifier in XMIT mode,
with no RF drive applied (beam only), and after the amplifier has thermally
stabilised (typically 2 hours after XMIT has been selected).
*
As close to the amplifier inlet and exhaust cowls as possible (to reduce the
effects of inaccuracies caused by radiation from duct walls).
*
As an average across the cross sectional area of the aperture/duct (to avoid
inaccuracies caused by uneven temperature distribution).
3.4
Mains Supply Connection
The safety notes at the start of this manual should be read before connecting the
amplifier to the mains supply.
The amplifier can be operated from mains supplies of 99 to 265 V ac without any user
adjustments. Both the live and the neutral connections on the amplifier are fully rated
and isolated for maximum line voltage, full transient and noise immunity.
The amplifier is supplied with one mains plug but no cable. Additional mains plugs are
available from e2v technologies, please contact your distributor. The connector
details are shown in figure 5. If the amplifier is to be used in applications where it is
exposed to rain or subjected to condensation, all attempts must be made to prevent
moisture ingress into the mains connector. The mains connector is supplied with a
range of cable retention bungs, these should be selected to suit the size of cable
chosen (see section 3.4.1). The cable bungs, if correctly selected, will seal to the
cable and prevent moisture ingress.
Figure 5
The mains connector pin identification
3.4.1
Mains Supply Cable Selection
Cable size and distribution protection must be determined by the user, and will
depend on the mains supply voltage to be applied to the amplifier.
If the amplifier is always used in an environment with a 240 V mains supply, then a
cable capable of carrying at least 15 A can be fitted.
A:
NEUTRAL
B:
EARTH
C:
LIVE
A
B
C
HBN63xx-1, Issue 8, Page 13
