4 23050—010-000 Rev A.
EXTRACTING MODULE FROM RACK
Turn power switch OFF on front panel before removing a module. Make sure that none of the
relay contacts are carrying large amounts of power (Fail is normally energized and will switch
when power is turned off). Arcing when breaking contact can damage the connectors at the
back of the board.
The QAS-51000 controller module is held in the rack on card guides and secured by captive
screws through the top and bottom of the front panel. These screws must be loosened before
removing the module. The module is held firmly in a card-edge socket at the back. Pull firmly
but carefully on the handle after making certain that the retaining screws are no longer
screwed into the rack frame, and slide the module out along the card guides.
Replacement is the reverse of this, sliding the module circuit board along the card guide and
carefully pressing it into the socket at the back before securing with the screws.
ON-BOARD SWITCHES – User switched functions
There are three on-board switch blocks enabling the user to select certain functions
as required. The switch blocks are referred to as, for instance, SB1(3) - the third switch
on switch block 1.
AUDIO
.
Switching SB1(2) on enables the buzzer to sound on fail and high alarms. When the controller
is specified to be used for oxygen with deficiency and excess alarms or when otherwise
specified the buzzer will sound for the low alarm condition as well.
LATCHING ALARMS
Relays/alarms may be nonlatching or latching depending upon switches off or on respectively.
SB1 (1) Fail Relay
SB1 (3) Low Relay
SB1 (4) High Relay
