Visit the Alpha website at www.alpha.ca for the latest manual and product downloads

6.7Controls

This menu category consists of power system controls. Parameters can be set/accessed such as low voltage disconnect (LVD), high voltage shutdown (HVSD), and counter electro-motive force (CEMF) in/out.

Many of the parameters are similar to the items found in 6.5.3 Configure Alarms; such as, relay mapping and alarm priority. Some parameters will not be displayed under the Configure window for all controls. Here are some of the additional parameters the Supervisor can expect to encounter:

Activation Timer — For LVD countdown timer (activation), tap on the number to edit via a virtual numeric keypad. Use with caution. Refer to the following section LVD Control.

NOTE: There are three possible triggers for opening the LVD, one of which is that loss of AC mains immediately starts the activation timer, if it is enabled, and the LVD will open at the timeout point.

DOD Activation — For LVD control, tap on the number (percentage of DOD) to edit via a virtual numeric keypad.

Disconnect Voltage, Connect Voltage — for each LVD (1-10), tap on the number(s) to edit via a virtual numeric keypad.

Inhibit Status — For LVD Inhibit, select from the pull-down menu; e.g., Inactive or Active. Selection will be in effect real-time and not saved.

Activation Value — For HVSD, tap on the number to edit via a virtual numeric keypad.

Bypass Voltage, In-Circuit Voltage — For CEMF, tap on the number(s) to edit via a virtual numeric keypad.

6.7.1LVD Control (USE WITH CAUTION)

The LVD feature controls a high capacity relay that disconnects the load during extremely low voltage conditions — such as a deep discharge of the batteries during an AC fail — and automatically reconnects the load once AC power returns. Discharging the battery down to an extremely low voltage can cause damage to the load and the battery. Having multiple LVDs will provide the capability of load shedding; where the least critical loads are disconnected first.

With the CXC, the Supervisor can program connect/disconnect settings to govern the operation of ten separate LVD controls. The LVD is activated when the Activation Voltage or the Activation Time is reached; whichever comes first. The LVD also extends an alarm signal and a message will display on the GUI.

Under this window of operation, there is a list of menu items (tap to select) with scroll bars for navigation, see Figure 81 below:

Select menu item to configure						Sliders and scroll bars
						are used for navigation
Tap Configure to change						Accept changes and
selected menu item
						return to previous screen

Figure 81–LVD Control window

Tap “Configure” to enter a new window of operation for the item selected. In this new window (Figure 82 below), the Supervisor can set the following parameters:

Name of item being edited

Toggle the check box to select

Discard changes and return to previous screen

Select from the pull-down menus:

Relay Mapping – N/A or relay 1 through 16. Priority – Major, Minor or Message.

Accept changes and return to previous screen

Figure 82–Configure (item selected) sample window

0350046-J0 Rev C

Page 81 of 127