Once the INVERTER is in position and all connections have been made per the Outline and Interconnect drawing, you are ready to proceed to the startup and test stages. At this point, all breakers should be in the off position and the MBS should be in the "LOAD ON BYPASS" position.
At your power panel, switch on the AC power feeding the INVERTER. With a voltmeter, check the voltage level present at the bypass input terminals and verify that they are the same as shown on the Outline and Interconnect drawing. If the levels are different, shut down the power to the INVERTER and contact Dependable power systems. NOTE: On 240V Delta systems, the B-C leg is the grounded center tapped leg. On three phase units, the rotation is A, B, C.
If external batteries are used, connect the batteries to the unit and close the external battery breaker if available. With a voltmeter, check the VOLTAGE AND POLARITY at the battery input terminals and verify that they are the same as shown on the Outline and Interconnect Drawing. If the polarity is wrong, reverse the input battery cabling and recheck with a voltmeter. If the voltage levels are different, shut down the power to the INVERTER and contact Dependable power systems. NOTE: The positive battery must connect to input terminal #12 and the negative connects to #11.
Using the startup procedure located on the circuit breaker panel, start the INVERTER. When the inverter starts, there will be a distinct buzzing sound from inside the cabinet. The front panel meters should be functioning. Check the inverter voltage using the inverter voltmeter, on three and two phase units check all phases.
After about 30 seconds, the "IN SYNC" LED should be illuminated. The failure of this LED to light on three phase units is usually the result of the BYPASS input AC power being of a different rotation than the inverter output. To correct this, follow the shutdown procedure located on the front of the unit, then turn off all input power to the INVERTER cabinet. Now reverse the B and C AC lines connected to the bypass input. If a 3 phase load has been connected to the output and was operating properly during the previous startup, it is likely, due to changing the bypass input rotation, that the B and C output lines will also have to be reversed.
Repeat the power verification and startup procedure. This time, after the inverter has started, the "IN SYNC" LED will be lit.
Press the "LOAD ON INVERTER" pushbutton and the "LOAD ON INVERTER" LED will illuminate. At this point, all green LED's should be lit and no red LED's should be on. The system is now ready for the operational mode.