Alpha Technologies Cordex HP CXRF 48-12kW - Manual (Page 19)

17 9400000-J0 Rev C
4.5 Digital Input Channels
The CXCM4 can accommodate up to four channels and can monitor digital alarm/control signals from rectifiers,
converters, and other types of equipment.
4.6 Alarm and Control Output Relays
The CXCM4 contains eight Form-C digital alarm output relays that are used to extend alarms and to control
external apparatus. Each internally generated alarm or control signal can be mapped to any one of the relays, or
several signals can be mapped to just one relay or none at all.
4.6.1 LVD Control (External Option)
The LVD control functions can be hard-wired directly from the assigned relay output to an optional LVD override
control and distribution alarm card. This protects against a load disconnect during a CXCM4 reset or replace-
ment; when the controller is off-line for example. Operators can perform test and maintenance procedures on the
CXCM4 without disturbing the load.
4.7 System Fail Alarm/Relay
The CXCM4 system fail alarm activates during a major internal failure. During such a condition, the unit will at-
tempt 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, which means that the alarm will be
extended even if the power to the unit is interrupted.