Rockwell Automation 1608P-200A480V... HC-DySC User Manual - Manual (Page 16)

16 Rockwell Automation Publication 1608P-UM005A-EN-P - November 2014
Chapter 4 Applying Power and Operation
HC-DySC System Operation
System Description The HC-DySC system consists of the DySC dynamic voltage sag correction
electronics together with an integral maintenance bypass switch. In the Normal
mode of operation the raw utility power is routed through the DySC electronics
to protect the loads from voltage sags and momentary interruptions.
Figure 8
shows a simplified one-line diagram for the system. Neutral and Ground
connections are passed straight through to the loads.
Figure 8 - One Line Diagram of the HC-DySC System
Maintenance Bypass
Operation The HC-DySC has an integral maintenance bypass switch. The maintenance
bypass switch is used to avoid power interruptions to the critical loads during
maintenance or service. The maintenance bypass switch consists of a bypass
circuit breaker (CBB), an input circuit breaker (CBI), and an output circuit
breaker (CBO). Under normal operating conditions raw input power is routed
through CBI to the input of the HC-DySC. The output of the HC-DySC is
routed to the load through CBO. CBB is normally open. CBB connects utility
power directly to the load, bypassing the HC-DySC, when operating in the
maintenance bypass mode.
SHOCK HAZARD: Dangerous voltages are present within the HC-DySC System.
The unit should never be operated with the enclosure door open except by
qualified and authorized personnel who are trained and familiar with the
operation of the unit and the location of components and voltages. Failure to
comply with this warning could result in injury or death.
L3 X3
X1
X2 L2
GND GND
CBB
CBO CBI
G
X1
X2
X3
L1
L2
L3
L1
HC-DySC
Electronics
N N
N
Breakers
Closed Function
CBI, CBO
CBI, CBB
CBB
Normal
Test
Bypass
WARNING: Dangerous voltages can still exist within the HC-DySC enclosure
even if the system is in bypass mode. Refer servicing to qualified personnel