Npaq® Hardware Manual
Installation and Configuration
2.4. Soft Start / Voltage Selection Overview
The Soft Start / Voltage Selection Board is used to limit AC inrush current during turn-on (
) and
provides the user with the means to configure the Npaq for different AC line voltages (
). This
board is normally accessible only by removing the top cover of the Npaq. If the -LineSel option is present; the
chassis cover will have access holes and labels indicating the switch settings.
For fuse information, refer to
.
2.4.1. Soft-Start Operation
Soft-Start circuitry automatically limits the inrush current to the Bus supply to approximately 10 A for
100/115 VAC operation and 20 A for 200/230 VAC operation. Inrush current limiting is only activated during
initial power-up or when AC power interruptions last longer than .3 seconds. Short power interruptions (less
than about .3 seconds) will not trigger the soft-start circuitry. This prevents the possibility of soft-start
induced nuisance circuit breaker trips during normal operation.
W A R N I N G : The Soft-Start circuit re24 VDC for proper operation (provided
internally). Damage to the Soft-Start circuit may result if +24 VDC is not connected.
Figure 2-5:
Soft-Start / Voltage Board
Table 2-3:
AC Input Power Connector (J1) Pin Assignment
Pin
Description
Wire Color
1
AC LO
Blue
2
AC LO
Blue
3
AC HI
Brown
4
AC HI
Brown
36
Chapter 2
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