Alpha Technologies VMX Series - Manual (Page 14)

14 017-940-B0-001, Rev. A
1.0 Introduction to the VMX Power Supply, continued
1.2 Inverter Overview
The inverter provides uninterrupted power to the ferroresonant transformer (via the batteries)
during line failures. During line operation, the inverter charges the batteries using a three-
stage (Bulk, Accept, and Float) charger.
Components:
• Smart Display: All operational functions, system testing, setup items, and alarms are
available via the Smart Display panel on the front of the VMX Power Supply (the Smart
Display is covered in detail in Section 5.2). Display functions are accessible by pressing
any of the four keys: ESCAPE, UP, DOWN, and ENTER. Backlighting is activated when
any of the four keys are pressed, and stays illuminated for one hour. There are four levels
of menu items: Operation Normal, Additional Information, Setup, and Alarms. Press
ENTER to display one level lower. Press ESCAPE to display one level higher. Press
ESCAPE to toggle between the main menu and alarm menu when alarms are present.
• Battery Breaker: The battery breaker disconnects the batteries from the inverter's
DC circuit. With the battery breaker turned off, the VMX Power Supply will not transfer
to standby mode, the inverter is disabled, and the battery charger cannot charge the
batteries. If an overcurrent is detected in the DC circuitry the breaker will trip.
• Battery Input Connector (Red = Positive; Black = Negative): The batteries plug directly
into the inverter’s battery connector. The connector is color-coded and fi ts in one direction
only.
• Inverter Cooling Fan: The inverter is equipped with a cooling fan that operates during
standby operation, or when the inverter heatsink temperature reaches 85°C. The fan
stays on until the temperature drops below 75°C. The fan also operates any time a self-
test is in progress.
• Battery Temp Probe Connector: The Remote Temperature Sensor (RTS) plugs directly
into the temperature probe (RJ-11C type) connector. The sensor end of the RTS is routed
to the battery compartment and taped directly to the side of the center battery. The RTS
provides battery temperature measurements used to adjust the battery charge voltage.
Fig. 1-3, Inverter Overview
Status LEDs
Smart Display
Battery Input
Battery Breaker
Battery Temperature
Probe Connector
Inverter Cooling Fan