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300. Maintenance
300.1 Safe Shut Down Procedure
CAUTION
To avoid possible equipment damage or personal injury, assume that there is AC voltage present inside the Synchron
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.
AC AND DC VOLTAGES WILL BE PRESENT INSIDE THE UNIT UNTIL LINE AC IS
DISCONNECTED AND ALL INTERNAL SWITCHES ARE TURNED OFF.
Do not touch components inside the unit. DC voltage is always present at the batteries and battery cables.
B. Final Shut Down Procedure
1. Open the unit’s front access panel.
2. Turn off the Main DC Switch, the Main AC Switch and any Output Circuit Breakers.
CAUTION: HAZARDOUS ENERGY IS STORED IN CAPACITORS INSIDE THE SYNCHRON 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 the batteries every 60 to 90 days.
CAUTION: The batteries will be damaged and the warranty voided if not routinely recharged.
NOTE: To turn power back on, follow the “System Start-up Procedure” outlined in Section 109. Be sure to
complete all of the steps to assure the unit will operate properly.
300.2 Routine System Maintenance
The Synchron inverter system unit is designed to provide years of trouble-free operation. Its self-monitoring features
and manually-initiated diagnostic cycles are designed to ensure proper operation of the unit's batteries and inverter.
The unit does require some routine attention to assure peak performance. Dual-Lite recommends a Preventative
Maintenance check be performed by a qualied service technician at least every six months. The technician must
observe important safety precautions while performing the following recommended tasks:
• Inspect and clean the unit interiors
• Inspect all batteries for leaks, case swelling or terminal corrosion
• Check the AC and DC meter functions and recalibrate if necessary
• Perform an emergency operation test to check operation of all critical connected loads;
300.3 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 Synchron 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
Synchron will revert back to standby operation; this may take a few seconds to allow the unit to synchronize back to
the line. For annual 90-minute discharge or other prolonged tests, simply turn off the AC Input breaker.
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