Capstone Turbine Corporation • 16640 Stagg Street • Van Nuys • CA 91406 • USA
Installation Guide: Capstone C1000S/C800S/C600S with C1000 Series Controller
480064 Rev C (December 2018) Page 100 of 122
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.
7.7. Dual Mode
An installation designed to switch between Grid Connect and Stand Alone operation is identified
as Dual Mode, and must meet the installation requirements for both Grid Connect and Stand
Alone operation. Automatic transfer between modes are accomplished with the Capstone Dual
Mode System Controller (DMSC). Refer to the Dual Mode System Controller Technical Reference
(Table 1) for details.
Some locations (generally where CE systems are used), require 4-pole circuit
breakers, and a 4-pole motor-operated breaker, which will break the neutral wire
as well as the three phases. The microturbine’s neutral must be grounded at all
times in both Grid Connect and Stand Alone modes. Therefore, a neutral-
grounding relay, capable of keeping the neutral grounded when the DMSC
switches the motor-operated breaker open, is required. This construction and
theory of operation is discussed in the Dual Mode System Controller Technical
Reference (Table 1).
7.7.1. Dual Mode Connections
See Figure 50 through Figure 51 for allowable dual modes connections. The DMSC controls the
motor-operated breaker which isolates the microturbines from the grid and protected loads.
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