14.
200. Maintenance
200.1 Safe Shut Down Procedure
CAUTION: To avoid possible equipment damage or personal injury, assume that there is AC
voltage present inside the
VST
inverter system unit any time AC input power or DC battery
voltage is applied. The inverter is capable of providing output voltage from the batteries even
when there is no AC input line voltage. When AC input voltage is present, the unit can provide
output voltage even when the batteries are disconnected.
Do not touch components inside the unit. DC voltage is always present at the batteries and
battery cables.
Final Shut Down Procedure
1.
Open the unit’s front access panel.
2.
Place the
VST
Battery Switch S2
in the off
OFF
position and then place the
AC Input circuit
breaker
at the service panel in the
OFF
position.
CAUTION: HAZARDOUS ENERGY IS STORED IN CAPACITORS INSIDE THE
VST
UNIT.
AFTER TURNING OFF SWITCHES, ALLOW 5 MINUTES FOR CAPACITORS TO DISCHARGE
BEFORE ATTEMPTING ANY SERVICE PROCEDURES.
3.
If the service technician does not need to access the inside of the unit, keep the unit’s front
cover/
door closed.
4.
If the unit will be shut off for an extended period of time, recharge batteries every 60 to 90 days.
CAUTION: The batteries will be damaged and the warranty voided if not routinely re-
charge
d.
NOTE: To turn power back on, follow the “System Start-up Procedure” outlined in Section
108.
Be sure to complete all of the steps to assure the unit will operate properly.
200.2 Routine System Maintenance
The
VST
inverter system unit is designed to provide years of trouble-free operation. The unit does re-
quire some routine attention to assure peak performance. The Manufacturer recommends a Preven-
tative Maintenance check be performed by a qualified service technician at least every six months.
The technician must observe important safety precautions while performing the following recommend-
ed tasks:
• Inspect and clean the unit interiors;
• Inspect all batteries for leaks, case swelling or terminal corrosion;;
• Perform an emergency operation test to check operation of all critical connected loads
200.3 Manual Routine Inverter Tests
NFPA101 requires that Emergency Lighting Equipment be tested on a monthly basis for a period of at
least 5 seconds, and a minimum of 90 minutes once a year. We strongly recommend these guidelines
be followed to insure system readiness, and to prolong battery life. The
VST
system was designed
with a front panel test switch to facilitate monthly testing. Simply depress the button and hold to test
the inverter at anytime. Once released, the
VST
will revert back to standby operation. For annual 90-
minute discharge or other prolonged tests, simply turn off the AC Input breaker at the service
panel.