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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Dual Mode Controller (DMC): User’s Manual Conditions to Open the Isolation Switch (M1) • POWER switch (S1) must be in the OFF position, • OR MODE switch (S2) is in TURBINE position, • OR MODE switch (S2) is in AUTO position AND utility voltage is not within acceptable range of undervoltage relay, • OR MicroTurbines are in Stand Alone Load state. In all cases, 12 or 24VDC power MUST be available from the MicroTurbine to trip the DMC Isolation switch (M1). Control Power Transformer Configuration The DMC contains a Control Power Transformer (CPT) that provides 120 volts (nominal) for use by the components internal to the DMC. The CPT contains various taps on the primary and secondary. The taps are configured for the correct voltage range prior to shipping from the factory and DO NOT require adjustment at installation. As a check, verify that the DMC voltage range is correctly rated for the line voltage at the point of installation. The voltage rating is displayed on the DMC door. Undervoltage and Timer Relay Settings Undervoltage Relay The DMC contains an undervoltage relay that determines whether and/or when to isolate the MicroTurbine(s) and protected loads from the utility grid (see Figure 6). The undervoltage relay (UVR) setting can only be changed from inside the DMC cabinet and its function is independent of the protective functions within the MicroTurbine. Refer to the Protective Relays Technical Reference manual (410033), as required. Trip Setting Time Delay Setting 400009 Rev A (May 2008) Page 15 of 21 Figure 6. DMC Undervoltage Relay 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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