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64
RELAY CHECK. When the selected channel is a HREF relay channel, select this
menu item and press the left (◄) or right (►) arrow button to enable or disable
the Relay Check function for the selected channel. Press the ENTER button to
implement the selection.
The HREF (Relay) channels rely exclusively on relays for signal switching. On
rare occasions after long periods of inactivity, the relay contacts can build up a
nonconductive coating on the relay contacts. This coating can create a condition
so that when a fault occurs and the ECO switches primary/backup sources, the
sync signal will not get through the ECO to the load.
When enabled, the Relay Check function measures the signal level on each HREF
input before and after every changeover switch. If the signal level indicates
that the channel is not connected to a load, then it is possible that the relay is
not properly closed for that channel. In that case, the instrument will cycle the
relay 20 times to attempt to wear through the layer of nonconductive coating to
restore the connection.
CAUTION.
Do not enable the Relay Check function on channels that are not
terminated, since the unterminated output looks similar to an open relay and will
cause unfounded Relay Check events.
LABEL. Select this menu item and press the ENTER button to access the edit
mode for the channel label. Use the channel label to help identify channels. For
example, you could label a channel "Master Sync" if that channel was carrying
the master sync signal for your video system. The channel labels can be up to
16 characters in length.
Press the left (◄) or right (►) arrow button to select a label digit and then press
the up (▲) or down (▼) arrow button to change the value of the selected digit.
After you edit the channel label, press the ENTER button to implement the change.
Press the BACK button to exit the label edit mode without saving any changes.
NOTE.
It is easier to enter the channel labels using the Web Interface. (See
page 95, How to use the Web Interface.)
ECO8000 Series Automatic Changeover Unit User Manual
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