Alpha Technologies Cordex 48-1.2kW - Manual (Page 31)

030-834-J0 Rev A Page 25 of 34
Voltage Input #2 (battery voltage per CXC software) is wired internally 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 LVD).
The Battery -48V should be connected at the battery system voltage terminal for CXCM1 reference when a
battery disconnect device is used. It is critical to CXCM1 operation as it ensures a source of power to the
CXCM1 should the disconnect device open the circuit.
Current
Current input #1 is wired internally to the system current shunt.
Temperature Sensor
Temperature Probe input channels provide connections for up to two temperature sensors. A voltage is
supplied to these terminals for sensor measurements.
5.11.2 Digital Inputs for CXCM1
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.
D1 is wired internally for CB/fuse trip. D2 is available for customer connections as required.
Connection Method
Typical Alpha 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 13) allows the
digital input to receive (or not receive) a Ground signal on an alarm.
Figure 13–Showing digital input connection method
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 9—60
Table B–Voltage level definitions for digital inputs