Alpha Technologies Cordex Controller Panel Mount_Rack Mount 125_220Vdc - Manual (Page 14)

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2.5 Analog Input Channels
The CXCP and CXCR each have up to nine analog channels, including up to five voltage inputs, two current
inputs, and two temperature inputs.
2.5.1 Voltage Inputs
Voltage-input channel V2 provides monitoring of the charge (battery) voltage. The CXC software is pre-configured
to monitor V2 for battery voltage. V2 is used as the system reference for rectifier float voltage, low voltage
disconnect (LVD), system high voltage alarm, and system low voltage alarm.
2.5.2 Ground Fault Detect (GFD)
V2 is also used for GFD (internally connected circuit). Ground fault is detected when either terminal of V2 (system
voltage that is normally connected to the battery string) shorts to earth ground either directly or through some
conductive means. The GFD circuit will detect a fault current range of ±10mA. The resolution is 1mA.
The GFD will trip an alarm if the fault current exceeds the user configurable Trip Value under Configuration menu
of Alarms/Configure Alarms/Miscellaneous Alarms/GFD. The default setting is ±5mA.
As with any analog input, the GFD can also be calibrated as required. See Analog Calibration menu in the CXC
software manual.
2.5.3 Current Inputs
Up to two current-input channels (I1 and I2) provide monitoring of current; e.g., discharge (load) and charge
(battery). The CXC software is pre-configured to monitor I1 for load current using an external DC current
transformer. The second optional current input is factory configured to monitor an external 50mV current shunt.
2.5.4 Temperature Inputs
Two dedicated temperature probe inputs (T1 and T2) provide monitoring of battery temperature or room/ambient
temperature. They may also be used for temperature compensation (temp comp). A voltage is supplied to these
terminals to power the temperature sensors.
2.5.5 General-Purpose Inputs
The general-purpose (GP) input channels monitor various analog signals depending on how the channels are
configured. The configuration determines whether the signals allowed are to be bipolar (may vary in either polarity
from zero, e.g. +/-150Vdc), unipolar (may vary positive from zero, e.g. 0 to +300Vdc), or temperature.
All four GP inputs are factory configured as unipolar voltage inputs.
2.6 Digital Input Channels
The CXC can accommodate up to four digital input channels.
NOTE: Each channel may be set by closing (shorting) or opening the inputs with a voltage free contact to achieve the
appropriate condition. This is differs from the digital inputs on other Cordex controllers which require a zero or
system voltage potential at the input to activate or deactivate the appropriate condition.
These channels can monitor digital alarm/control signals from rectifiers, converters and many other types of
equipment. Some of these channels are pre-assigned to monitor specific signals. See the Software manual for
more information.
2.7 Alarm and Control Output Relays
Each CXCP or CXCR contains eight standard and eight optional Form C alarm output relays to extend alarms
and control external apparatus. Each internally generated alarm or control signal may be mapped to any one of
the 16 relays, or, several signals may be mapped to just one relay or none at all.
2.8 CXC System Fail Alarm/Relay
The CXC system fail alarm activates because of a major internal failure. During such a condition, the unit will
attempt to reset, but if this fails, an alarm condition will be extended to a relay and the red LED on the front panel
will illuminate. This is a fail-safe signal to the remote monitoring equipment; i.e. alarm will be extended even if
power to the unit is interrupted.