NPS2400
User’s Manual
Rev. 3.0
– 17.02.2015
Page 15/38
4.3.7
Remote shutdown input
Figure 14 Remote shutdown input connection with external signal
Figure 15 Remote shutdown input connection by using the AUX power supply
The device includes an opto-isolated input used to remotely shutdown or enabling the device output without the need for
disconnecting the mains input. This input can be used in 2 ways:
a)
External signal
: when applying an external DC voltage as shown on Figure 14 from 5VDC to 24VDC to the
SHUTDOWN inputs the NPS2400 output will be turned ON or OFF depending on the programmed shutdown polarity
(see §6.4.9).
b)
External switch or relay contact
: by connecting an external switch or relay contact as indicated in Figure 15 the
NPS2400 output can be switched ON or OFF by only acting on the switch or relay contact.
4.3.8
Auxiliary 12V/100mA output
The NPS2400 provides an
auxiliary power supply rated 12V/100mA
(max.). This supply is available on the
+12V AUX/ GND
AUX
terminals of the auxiliary connector. The auxiliary supply is floating (isolated) with respect to the SMPS output. Take care
when using the 12V auxiliary output in conjunction with remote output current measurement to avoid ground loops.
The 12V auxiliary output is short circuit protected by an active circuit.
4.3.9
Auxiliary relay dry contacts
NPS2400 provides an SPDT relay with normally open (NO) and normally closed (NC) dry contacts. They normally indicate that
the output voltage is present and regulated (DCOK). Other functions are available for the relay, see chapter 6.4.18, 6.4.19,
6.4.20 and 6.4.21 for details. When the device is operating in battery charger mode (
only on “-24” and “-48” models) the relay is
excited when the battery charging process is terminated, overriding all the other functions.
