Scientific Atlanta PowerVu D9228, Installation And Operation Manual

Page: 71 / 110

707-161 Rev. 3 Using the Menus 3-25
R34
- Misc Diagnostics Menu
(continued)
Ref Description
C
Alarm mask 1 : displays the current trigger criteria for Alarm 1 relay on
the back panel. There are 32 bars in this field, each corresponding to one of
the 32 predefined alarm conditions.
Under no-alarm conditions, terminals C and NC on the relay Alarm 1 are
electrically open. However, if you enable an alarm condition (Ref. F) for
this relay and the alarm occurs, terminals C and NC on the relay close and
C and NO become electrically open. When you enable an alarm condition,
its corresponding bar is displayed in yellow in this field.
Note: C-NC is electrically closed when a-c power to the MDR is removed.
This occurrence can be used to trigger an alarm-monitoring device.
D
Alarm mask 2 : displays the current settings for Alarm 2 relay on the back
panel. There are 32 bars in this field, each corresponding to one of the 32
predefined alarm conditions.
Under no-alarm conditions, terminals C and NC on the relay Alarm 2 are
electrically open. However, if you enable an alarm condition (Ref. G) for
this relay and the alarm occurs, terminals C and NC on the relay close and
C and NO become electrically open. When you enable an alarm condition,
its corresponding bar is displayed in yellow in this field.
Note: C-NC is electrically closed when a-c power to the MDR is removed.
This occurrence can be used to trigger an alarm-monitoring device.
E Left and right arrows: click these buttons to move the pointer to a different
alarm position.
F Toggle mask 1 button: click this button to toggle alarm conditions in the
Alarm Mask 1 field (Ref. C) between enabled and disabled states. The
toggle applies to the alarm currently pointed to.
You can enable or disable as many alarm conditions as you like. If an
enabled alarm occurs, Alarm 1 relay reacts (Ref. C).
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