ST950S Plus+ Installation and Commissioning Manual
10.4.2. General Requirements
When replacing cards, the original card should be inspected and the following points checked:
•
Check the connectors on the card. Are any pins bent, broken or damaged in any way? If there
are, make a note of the card and pin number in the Controller Visit Logbook as the backplane
may have been damaged.
•
Check any ICs that are mounted in sockets and ensure they are securely fitted.
•
A problem with a loose-fitting IC or use of an incorrect one can usually be rectified easily without
having to fit a replacement card.
•
Do not forget to record the replacement in the Controller Visit Logbook.
•
Complete a fault label and return the faulty card for repair.
10.4.3. Access to Cards in ST950 Plus
+
19” Controller Rack
Most cards in the rack have connectors at their rear edge linked to various parts of the system. In
order to gain access to the rear of the cards, first swing out the ST950 Rack Assembly. Release this by
undoing the two screws at the right hand edge of the frame. Having done this there is room to reach the
back of the cards to deal with the ribbon cables.
The cards are held in the rack by retaining strips at the front, which must be moved clear after first
loosening the strip clamping screws.
Exercise care when withdrawing cards so as not to damage the ribbon cables as they pass across the
rear edge of the rack.
I/O cards are located on the back panel of the controller. The swing frame should be swung out of the
way first, then the I/O card(s) can be reached.
Intelligent Detector Backplane cards are fitted to the rear of the separate 3U detector rack.
10.4.4. Replacement of 48V PSU
Important:
The 48V PSU can be changed without the need to switch off the controller, assuming
redundant configuration. The redundancy unit will manage the load sharing accordingly.
The 48V PSU should be disconnected at the mains voltage side using the 2-part in-line mains
connector below the PSU. Thereafter the 48V cables can be unscrewed and removed from the PSU
terminals.
The DIN rail latch can be released, by using a flat screwdriver to lever up the small protrusion at the top
of the PSU, and then lifting the PSU upwards.
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