KEPCO RA 19-1U Operator Manual - Manual (Page 36)

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RA 19-1U 020413
2.4.4.2 N.C. ALARM LINE (OPEN ON FAILURE)
The N.C and COM line of each 1U HSF supply provide an open contact (open circuit) upon fail-
ure. To configure multiple power supplies so that a failure of any supply produces a failure indi-
cation, it is necessary to connect the N.C. line of one, with the COM line of the next power
supply, so the alarm line is connected in series.
2.4.4.2.1 OPEN ON FAILURE USING REAR PANEL DIP SWITCHES
The open on failure alarm for multiple power supplies is accomplished by setting the associated
DIP switch, position 8, to ON (closed) for each slot included in the alarm circuit as indicated in
Figure 2-14. Setting DIP switch position 8 to ON (closed) connects the N.C. line to the COM line
of the adjacent power supply. Figure 2-14 illustrates an open on failure alarm configuration for
four power supplies using rear panel DIP switch settings.
CAUTION: The user is responsible for ensuring that the alarm circuit does not exceed
DIP switch specifications: 100mA, 50V d-c, maximum.
To configure PS1, PS2, PS3 and PS4 as open on failure, set position 8 of DIP switches DIP 2,
DIP 3, and DIP 4 to ON (closed). The failure indication (open circuit) will be present across
N.C.4 and COM 1.
FIGURE 2-14. OPEN ON FAILURE ALARM CONFIGURATION USING REAR PANEL
DIP SWITCHES, SIMPLIFIED DIAGRAM