Alpha Technologies CXPS 48-1.8-i, 48V Pos Gnd - Manual (Page 34)

Argus Technologies Ltd. 053-990-C0 Rev A WC
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5.10.2 Digital Inputs for CXCI
The digital input channels (factory-installed) are used to monitor various alarm and control signals. All input
channels are voltage activated and accept a bipolar (i.e. negative or positive) DC signal directly.
For the CXCI option, only D1 and D2 are available.
5.10.2.1 Connection Method
Typical Argus systems use the “reset with Hot and trigger with Ground” connection. The digital
input is wired in such a way that the Hot is wired directly into one of the input terminals; e.g.,
negative input for -48V systems. The other input terminal is wired to the Ground (common) of
the system through a relay (dry contact – usually located on the equipment requiring
monitoring). This method (see Figure 14) allows the digital input to receive (or not receive) a
Ground signal on an alarm.
Figure 14–Showing digital input connection method
5.10.2.2 Programming the Digital Input
The digital input channels can be programmed for “active high” or “active low.” Active high
indicates “alarm on the presence of a ground signal” and active low indicates “alarm on the
removal of a ground signal.” See CXC Software manual for detailed instruction on
programming.
Voltage Range (VDC)
Voltage Level (VDC)
Considered As “0” (Off) Voltage Level (VDC)
Considered As “1” (On)
0—60
(system voltage setting)
0—3 18—60
Table C–Voltage level definitions for digital inputs
5.10.3 Analog Inputs
CAUTION: Ensure the correct polarity is used for all input cable terminations.
The analog input channels are used to monitor various types of electrical signals. Some of the analog channels
are reserved for specific signals, while others are designated as general-purpose inputs, which accommodate
various types of analog signals.
For the CXCI option, Battery Hot input on the I/O board is factory wired to the battery system voltage terminal for
CXCI reference when a battery disconnect device is used. It is critical to CXCI operation as it ensures a
source of power to the CXCI should the disconnect device open the circuit.
5.10.3.1 Voltage
Voltage Input #1 (load voltage per CXC software) terminals (V1) on the shelf provide
connections to an optional secondary voltage input. For example, this can be terminated to the
load side of an LVD contactor to monitor load voltage.
Voltage Input #2 (battery voltage per CXC software) is wired internally (V2) to the rectifier output
voltage of the shelf. This is used as the reference for system alarming (such as high voltage)
and control (such as low voltage disconnect).