HRK3-HB-7
V
IA
L
ITE
HD
3U
CHASSIS
H
ANDBOOK
16
5
ViaLiteHD power supplies
5.1
6HP Chassis Power Supplies
The HPS series power supplies provide DC power to all plug-
in modules in the 19” chassis. Two versions are offered, HPS with universal
mains input and HPS-DC with wide range DC input. Either one or two HPS modules can be fitted. Two HPS modules will provide dual
redundant operation. Separate supply inputs mean that they can be operated from different supplies for even higher levels of availability.
During normal operation, the supplies current share to maximise reliability. In the event of a failure all the chassis current will be provided by
the remaining operational module. The front panel LED provides a visual indication of failure, and a power good alarm output is available for
use at the
“Alarm Concentrator” connector.
The modules are fan-cooled for maximum reliability and each PSU offers an MTBF of 270,000 hours at an ambient temperature of 40
C.
The HPS power supply has a wide range alternating current (AC) input and can operate from 110V and 230V nominal mains supplies. Mains
power is applied at the rear of the chassis via an earthed IEC60320 connector, and regulated direct current (DC) power is supplied to the
chassis backplane PCB for distribution to the plug-in modules. This connector is also used for reporting PSU alarm status.
For DC versions HPS-DC, power is applied at the rear of the chassis via a 2-pole screw terminal connector; it will operate from a wide range
DC input 20-72Vdc.
Both types of power supply are internally fused; this fuse is only expected to fail under fault conditions. The fuse is located internally
underneath the earthed safety cover; this is not user serviceable and must be returned to
ViaLite Communications
for replacement.
On the front panel the module has a single LED indicator. This reports the status of the module. IF the LED is
GREEN
the module is
operating in its normal non-alarm state. If the LED is OFF, the power supply is not supplying 12V and has either failed or is in standby mode,
see section 4.7.
