Alpha Technologies CXPS-HD 48-1.2-225 - Manual (Page 29)

0530082-J0 Rev B Page 21 of 31
5.10.2.2 Programming the digital input
The digital input channels can be programmed for “active high” or “active low”. Active high indicates an alarm
when a ground signal is present. Active low indicates an alarm when the ground signal is removed. See the
controller software manual.
Voltage range (VDC)
Voltage level (VDC)
considered 0 or off Voltage level (VDC)
considered 1 or 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 that 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 that accommodate
various types of analog signals.
The Battery Hot input terminal on the I/O board is factory wired to the battery system terminal. This is done so that
the batteries will provide power to the controller when the main power circuit is disconnected from the batteries.
5.10.3.1 Voltage
The Voltage Input #1 (V1) terminal is located on the shelf to provide connections to an optional secondary voltage
input. For example, this input can be terminated to the load side of an LVD contactor to monitor the load voltage.
The Voltage Input #2 (V2) is wired internally to the rectifier output voltage of the shelf. This input is used as a
reference for system alarms such as a high voltage, and for controls such as a low voltage disconnect.
5.10.3.2 Temperature sensor
The Temperature Probe input channels (T1 and T2) provide connections for temperature sensors. A voltage is
supplied to these terminals for sensor measurements.
5.10.3.3 Current
The Current Input #1 terminal (I1) is factory wired to the battery shunt.