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D400 Substation Data Manager User's Manual 69
5.3 Power Supply Alarms
The D400 includes connections for two power supply alarms:
• Power Fail to indicate one of the two power supplies or one of the two power feeds
has failed
• System Fail to indicate system operation status
Terminal block TB2 on the rear panel of the D400 provides contact closure outputs for
connection to an external circuit, for example, to connect an external LED indicator or
audible alarm.
The contact closure used for alarm outputs is a solid-state photo-MOS device. Contact
closure output ratings at maximum ambient temperature are:
• Continuous current: 0.1 A continuous at 300 VAC / 300 VDC
• Peak current: 0.28 A peak for 10 ms
• Maximum on resistance: 35 ohm
Power Fail Alarm
The Power Fail contact closure provides for an external LED indicator (lamp) or audible
alarm upon loss of power.
The indicator or audible alarm can be wired to operate as follows:
• ON when power is present
• ON when a power failure has occurred
The Power Fail contact closure provides three contacts (terminals 1, 2 and 3) on terminal
block TB2.
Caution: Contact closure rated for 0.1 A @ 300 V maximum.
» To connect the Power Fail contact closure:
1. Remove the terminal block protective plastic cover.
2. Wire a lamp or audible alarm to terminals 1, 2 or 3 on terminal block TB2 as follows
(see figure):
To enable the indicator when power is… Wire the lamp between…
Present Terminals 1 and 2
Absent Terminals 2 and 3
For proper connection, the recommended tool torque settings for power terminal
screws are 10.8 in-lb [1.22 Nm].
3. Replace the terminal block protective plastic cover.
!