User`s manual

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6
SECTION 1- OPERATION
1-1 INTRODUCTION
The DEFENDER HARSH ENVIRONMENT (HE) DE1 (Emergency Lighting Inverter)
from DSPM provides an exceptional level of load protection and monitoring capabilities.
The critical load is provided with conditioned, regulated, computer- grade power at all
times. Both the voltage level and frequency are controlled at all times to the load.
When the input power is lost to the DE1, such as during a power outage, the DE1
automatically draws power from its internal battery supply. The critical load receives
only clean sine wave power at all times. There are no disturbances or power
interruptions on the output when the DE1 transfers to battery operation. Transfers to
and from battery operations are “No Break” transfers. The internal maintenance-free
batteries provide a few minutes to hours (depending upon model) of backup power.
Upon restoration of input power, the DE1 automatically resumes normal operation. Also
the DE1 immediately begins to recharge the batteries.
The DEFENDER HE is a dual conversion single and three phase DE1 available in
output ratings of 2 to 150 kVA. The DE1 is designed and built to UL1778 and/or UL924
standards. The DE1 is available with input voltages of 120, 208, 240, 277 and 480 VAC;
and output voltages of 480, 277, 240, 208, and 120 VAC. This information is provided
on the nameplate located on the inside of the front door.