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9400000-J0 Rev E
Voltage level definitions for digital inputs
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 HP Soft-
ware 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)
-1 to +1*
(-60 to -5) or (+5 to +60)
*NOTE: The range 1 – 5 +/- is undefined.
7.7.3 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.
The Battery -48V should be connected at the battery system voltage terminal for CXC HP reference when a battery
disconnect device is used. It is critical to CXC HP operation as it ensures a source of power to the CXC HP should
the disconnect device open the circuit.
Voltage
Voltage Input #1 (load voltage per CXC HP 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 HP 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 dis-
connect).
Temperature Sensing
Temperature Probe input channels provide connections for temperature sensors. A voltage is supplied to these
terminals for sensor measurements.
Current
Current Input #1 (discharge or load current per CXC HP software) terminals (I1) are available for customer connection
as required.
Current Input #2 (charge or battery current per CXC HP software) terminals (I2) are available for customer connection
as required.
