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Capstone Turbine Corporation • 21211 Nordhoff Street • Chatsworth • CA 91311 • USA Technical Reference: Dual Mode System Controller (DMSC) Normal operation is when the utility grid is providing stable electrical power, the remote disconnect device is closed, and the microturbine is providing power in Grid Connect mode. Figure 27 provides a schematic of the control logic used by the DMSC to toggle the GC Enable, SA Enable, and Start/Stop signals. When the utility grid experiences an undervoltage disturbance, the UVR in the DMSC closes output relay contact RL1 (Figure 27). At this time, the remote disconnect device is still closed. The normally-closed auxiliary contacts M1-A1 in the remote disconnect device are open and the normally-open auxiliary contacts M1-A2 are closed, so the SA Enable and GC Enable signals are not yet toggled. Not shown in Figure 27 is the circuit that also uses an output command from the UVR to trip the motor-operated disconnect device open within 5 seconds. When the motor-operated disconnect device (M1) opens, auxiliary contacts M1-A1 and M1-A2 toggle so that M1-A1 is now closed and M1-A2 is open (as shown in Figure 27). If the manually operated DMSC switch contacts S1B and S2A are also closed and the Annunciator Panel Automatic Operation relay RL5 is closed, then SA Enable is activated and GC Enable is deactivated. The Start/Stop signal is also activated. This will cause the microturbine to transition from Grid Connect mode to Stand Alone mode, as shown in Figure 28. Note that the use of the auxiliary contacts in the remote disconnect device assures that the microturbine will not be commanded to the Stand Alone mode unless it is isolated from the utility grid. The complete transition from initial utility voltage fault to Stand Alone will typically take less than 10 seconds, depending on the severity of the fault, protective relay delay settings in the microturbine and the time delay in the DMSC’s UVR control circuit. 24V GROUND TB1 RL7 RL8 Remote Disconnect Device (M1) M1-A1 M1-A2 TB28 S1B 0XX RL5 TB3A RL7 RL8 RL1 D1 S2A 0XX SA ENABLE TB3 TB2 GC ENABLE TB23 TB11 TB4 START/STOP 24V From MT TB6 TB27 Figure 27. Control Circuit to Toggle GC and SA Enable Signals Once the utility voltage has returned to normal, the UVR will open contact RL1 (see Figure 27). This will inactivate the SA Enable input to the microturbine, as shown in Figure 28. After a fixed one-minute delay, the microturbine will automatically transition to Hot Standby mode, and the SA Load output signal will go inactive. The DMSC uses the SA Load inactive signal to allow the remote disconnect device to close. Once the switch closes, the Start/Stop signal is opened by auxiliary switch contact M1-A1, acting through relay RL7, which causes it to become inactive, 410071 Rev D (January 2010) Page 62 of 71 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 System Controller DMSC
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