Alpha Technologies CXPS-E3 19, Техническое руководство

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9400016-J0 Rev D 18
4.7 LVD Override
For systems with LVBD an over-ride interface is provided, see Figure 12. This interface board includes 3 LEDs indica-
tors to provide visual status indication, and two customer connections for remote control/monitoring:
LEDs
• BUS (Green) Lit when the bus connected to the LVD has power connected.
• COIL (Green) Lit when the LVD coil is energized. This requires the BUS to have power and one of the controls
(L-ADIO, REMOTE, or LVD Over-ride) to be active
• O/R (Yellow) Lit when the override switch is in the over-ride position. This should only be on during maintenance.
Connections
• OVERRIDE 48V/5mA signal, active when over-ride switch is in over-ride position.
x COIL CTRL Control input for LVBD coil, can be configured for remote control or remote disable:
When configured for remote control (default), a dry contact connected to the coil control input can turn
on the LVBD independently of the LVD or the automatic control.
x When configured for remote disable, the coil control input must be shorted by a dry contact for either
the automatic control or the LVD override to operate.
The LVBD override interface is configured for remote control by default for most systems.
Figure 12 — LVD Override
Figure 13 — LVD Override Interface