User's Manual

SBS-900 Shore Based Radar Systems
Chapter 10: Corrective maintenance
KH-1602-2 issue 1: Standard SBS900 Systems Operator & Maintenance Handbook
Page 191 of 240
10.8.7.2 PSU removal
Power supply fail warning: If a PSU failure warning is received on the RDU, optional service display
or command and display system, first check that AC power is present at the RDU
input and at the power supply. If AC power is available at the unit the PSU will need to
be changed.
Removal: The power supply unit is retained within nb_ Q[^[l Ccmnlc\oncih Thcn \s nqi e_s_^
locating posts and two bolts.
WARNING: High earth leakage current devices are fitted to the dual power
supply. Do not operate the power unit when mechanically or electrically
disconnected from the RDU chassis or with SK1 of the MISM backplane
disconnected.
WARNING: Prior to commencing any maintenance procedure, users must
familiarise themselves with the health & safety warnings noted in the
planned maintenance and health and safety sections of the system
handbooks.
AC supplies: Prior to carrying out any maintenance, the system must be
fully isolated and disconnected from all single and 3-phase AC supplies.
See system isolation in the planned maintenance section of the system
handbook.
UPS (Uninterruptable Power Supply): Where connected, ensure that
UPS supplies to the RDU are fully isolated prior to carrying out any
maintenance task on the system.
Prior to removal, the following connections will need to be removed:
- ORT @ [h^ A @B chjonm
- DC connections to backplane
- Signal outputs to backplane
- Earth connection to PSU mounting pillar (pink cable marked PSU)
Locating post
Main securing bolt
Main securing Bolt
Obscured in drawing
Locating post
DC connections to
backplane
Signal outputs (x2) to
backplane
ORT A @B chjonORT @ @B chjon