What happens if there is a bad input on the backup side and the primary then fails on an ECO422/D?

Question:

What happens if there is a bad input on the backup side and the primary then fails on an ECO422/D?

Answer:

The behavioral logic of the ECO422D is described in table 2-3 on page 2-8 of the ECO422D user manual (also shown below). One general rule of thumb is that the unit will NEVER automatically switch to a bad signal; it can only switch to a bad signal if told to do so by the user.

As shown on line 1 of the table below, if the backup is bad and the primary fails in normal operation mode then no switch will take place and the unit will remain passing through the primary signals.

Ln. #PowerUser Config ModeSwitch ButtonPrimary is…Backup is…Output (auto mode)Output (manual mode)
1OnNormalNo SwitchBadBadNo SwitchNo Switch
2OnNormalNo SwitchBadGoodBackupNo Switch
3OnNormalNo SwitchGoodBadPrimaryNo Switch
4OnNormalNo SwitchGoodGoodNo SwitchNo Switch
5OnNormalSwitchBadBadSwitchSwitch
6OnNormalSwitchBadGoodBackupBackup
7OnNormalSwitchGoodBadPrimaryPrimary
8OnNormalSwitchGoodGoodSwitchSwitch
9OnOverrideNo SwitchBadBadNo SwitchNo Switch
10OnOverrideNo SwitchBadGoodBackupNo Switch
11OnOverrideNo SwitchGoodBadPrimaryNo Switch
12OnOverrideNo SwitchGoodGoodNo SwitchNo Switch
13OnOverrideSwitchBadBadSwitchSwitch
14OnOverrideSwitchBadGoodBackupSwitch
15OnOverrideSwitchGoodBadPrimarySwitch
16OnOverrideSwitchGoodGoodSwitchSwitch
17Offn/an/an/an/aPrimaryPrimary

This FAQ Applies to:

Product Series: Sync Pulse Generator

Product: ECO422D

FAQ ID : 64086

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