Operating instructions

6 | MCO-5211
3.2 Jumpers
3.2.1 PP1 - Audio
Beeper
The audible alarm can be programmed to three different functional modes using jumper PP1.
Jumper position Status Description
Center (factory default) OFF No connection
Front FOLLOWS ALARM The beeper follows the alarm function and is reset together with
this function from the front of the instrument
Back FOLLOWS FAULT The beeper follows the fault indicators on the front of the MCO-
5211. The fault indicators are directly controlled by the error
signals from the MSG-5300s. Whenever an error is detected in
any of the MSG-5300s, the beeper will sound.
3.2.2 PP2 - Change Over
Jumper PP2 enables the "one time switching only” function in AUTO mode.
When multiple switching is selected and a short circuit appears downstream from the changeover, the error cannot be
corrected and the changeover will start switching back and forth between the two sync generators. This can be overcome
by use of the "one-time switching only" function.
When an error is detected in the primary sync generator, the changeover switches to the backup unit. The changeover
will then switch back to the primary if the error flag from the primary disappears as long as "multiple switching" is
selected. The changeover will not switch back when this happens if "one-time switching only" is selected.
Jumper position Status Description
Front (factory default) One-time switching only Switch to backup, but do not return to primary when error flag
disappears.
Back Multi-time switching Switch back to primary when error flag disappears
3.2.3 PP3 - Alarm
The triggering of the alarm relay with contacts connected to the remote connector is programmed using this jumper.
Jumper position Status Description
Front (factory default) Auto and manual modes Close the alarm relay contacts on the remote interface when a
sync generator error is detected while the changeover is
operating in either Auto or Manual mode.
Back Auto mode only Close the relay contacts on the remote interface only when a
sync generator error is detected while the changeover is
operating in Auto mode.
Once triggered, the alarm relay is latched, and must be reset by selecting MANUAL, or by designating one of the
generators as primary, using the front panel controls.