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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Dual Mode Controller (DMC): User’s Manual The undervoltage relay isolates protective loads when any phase voltage of the utility grid falls to 85 percent of the trip setting. If the illuminated LED “UV” turns off, the DMC has failed to reach the required voltage in a preset amount of time. The trip setting is adjustable (upper dial) from the front of the relay. Typically, this should be set to the nominal line voltage. As shipped, the undervoltage relay is set to match the voltage rating of the voltage-rated DMC. However, this setting can be changed at installation. The undervoltage relay also ensures that DMC phase sequence is consistent with the utility phase rotation. If incorrect phase rotation wiring is detected, the illuminated LED “R” will turn off and Grid Connect operation is disallowed. The utility, MicroTurbine(s) and protected loads MUST ALL be connected in a consistent phase rotation sequence. Normally, this sequence is L1-L2-L3. However, in cases where the utility phase rotation is determined to be other than L1-L2-L3, the MicroTurbine, DMC Isolation switch (M1), undervoltage relay and protected load connections must ALL be re-wired for consistent phase rotation with the utility. The UV time delay setting (lower dial) allows the user to manually configure the time lapse (1 to 10 sec) before the DMC undervoltage relay trips. The delay is only effective if L1-L2 voltage remains greater than 50 percent of nominal. Otherwise, the relay will drop out immediately. Timer Relay The DMC contains a timer relay dial (0.1 to 30 sec) that sets the delay between the solenoid operator controlling the DMC Isolation switch (M1), as it moves from trip to OFF, then OFF to ON. The installer SHOULD NOT adjust this dial – the dial is factory set to 1 second. This relay is not related to the undervoltage user settings associated with the MicroTurbine. Figure 7. Timer Relay 400009 Rev A (May 2008) Page 16 of 21 Capstone reserves the right to change or modify, without notice, the design, specifications, and/or contents of this document without incurring any obligation either with respect to equipment previously sold or in the process of construction.PDF Image | DUAL MODE CONTROLLER (DMC) USER’S MANUAL
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