MDO16GNS October 2005 – Issue 2
15
Triguard
SC300E MDO16GNS 16-Channel D/O Module 48Vdc
SINGLE-SLOT HOT REPAIR
1.
Operate the On/Off Line Request switch on the faulty module. The three On Line LEDs
should all extinguish to indicate that the main processors have recognised the request
and taken the module off-line. The last read data input from the module will be
maintained until the new module is on-line.
2.
Slacken the two module securing screws and use the black ejection levers (top and
bottom) to draw the module from its slot.
3.
Insert the new module ensuring that it engages properly in the upper and lower guides
in the chassis. The top and bottom chassis rails carry alignment marks to assist. Pull
out the ejection levers and as the module is pushed back engage the levers on the
chassis rails. The levers should then be used to draw the module into position, some
resistance will be felt as the rear connector pins engage. The module should be fixed
in position with the securing screws.
4.
Operate the On/Off Line Request switch and check that the three On Line LEDs
illuminate for one second, extinguish for one second and then illuminate permanently
to indicate that the module has been put on-line. If the LEDs do not illuminate either
the first or second time or fail to remain illuminated, then the module must be
considered faulty.
DUAL-SLOT HOT REPAIR
1.
Insert the new module into the vacant hot repair slot ensuring that it engages properly
in the upper and lower guides in the chassis. The top and bottom chassis rails carry
alignment marks to assist. Pull out the ejection levers and as the module is pushed
back engage the levers on the chassis rails. The levers should then be used to draw
the module into position, some resistance will be felt as the rear connector pins
engage. The module should be fixed in position with the securing screws.
2.
Operate the On/Off Line Request switch on the new module. Ascertain that the three
On Line LEDs on the new module illuminate for one second, extinguish for one second
and then illuminate permanently as the LEDs on the old module extinguish. This
sequence indicates that the new module has been put on line and the old module
taken off-line. If the LEDs on the new module do not illuminate either the first or second
time or fail to remain illuminated, the new module must be regarded as faulty. The old
module’s LEDs should remain illuminated indicating that it is still on-line.
3.
If the new module is serviceable slacken the screws on the old module and use its
ejection levers to remove it from the chassis.
PREVENTIVE MAINTENANCE
No preventive maintenance is necessary.
