Alpha Technologies Cordex Controller Ver.2.0 - Manual (Page 81)

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6.7.1.1 DOD Activation
This menu item (LVD DOD Control) allows the Supervisor to configure each LVD control for
activation once the percentage of Depth of Discharge (DOD) has increased above a threshold.
This control works in conjunction with the existing LVD countdown timer and the disconnect
voltage. Whichever programmable parameter is met first, the LVD will be activated. Typically,
LVD DOD control is needed when ac mains fails, battery monitor is enabled, battery has
discharged for more than one (1) minute and DOD has risen above the threshold. If DOD
activates LVD, then the low voltage connect (LVC) causes reconnect.
6.7.2 LVD Inhibit
The LVD Inhibit feature provides the means to temporarily prevent all LVD controls from activating without
disabling the LVDs altogether, see example below. The Supervisor will then have 10 minutes to assess and
correct the condition(s) causing the LVD activation.
This menu item differs from other controls in that it cannot be disabled; “Enable Alarm” is grayed out. With that
exception, the remainder of the configuration is similar to all other controls (relay mapping, etc.), see Figure 81
above. It is logged in an identical manner, except that the only possibilities are ACTIVE and INACTIVE. Selection
will be in effect real-time and not saved – resets on power off.
Operation Example:
1. LVD condition occurs.
2. Audible alert sounds and a pop-up window will appear on the GUI prompting the user
to “Inhibit LVDs.”
3. For up to 60 seconds, LVD Inhibit may be evoked by the Supervisor. A password
prompt (with counter) will appear as required.
4. Selecting “Cancel” will reset the 60-second countdown; otherwise, if this time should
expire, the LVD Control will proceed to disconnect the load as configured.
5. Once evoked, LVD Inhibit control, now ACTIVE, will prevent LVD controls from
activating for 10 minutes.
6. LVD condition is corrected by Supervisor or LVD Inhibit may be evoked again.
7. Once LVD condition is corrected, LVD Inhibit must be reset manually as required.
6.7.3 HVSD
This menu item enables the Supervisor to program the setting for a HVSD control, which energizes a relay that
can shut down one or more rectifiers when the output voltage exceeds the Activation Value. The output from
HVSD relay is connected to the Remote Shutdown input on the rectifier cabinet. An alarm is also activated and
the message HIGH VOLTAGE SHUTDOWN will display on the CXC’s GUI.
6.7.4 CEMF
The CEMF Cell is a stand-alone panel; which is used to reduce the load voltage (by up to 3.0Vdc) to protect
sensitive loads from high voltages during battery equalize and float cycles.
6.7.4.1 Bypass Voltage
This menu item enables the Supervisor to set the voltage breakpoint to close the CEMF relay
and bypass the CEMF cell (or diode); to directly connect the load to the rectifiers without voltage
drops.
6.7.4.2 In-Circuit Voltage
This menu item enables the Supervisor to set the voltage breakpoint to open the CEMF relay
and connect the CEMF cell (or diode); to give the appropriate voltage drop to protect the load
connected to the rectifiers.