Polycold Cryochiller Appendices
Installation and Operation Manual Appendix C: CB2 Excepted Wiring
Brooks Automation
214072 Revision B
12-5
Appendix C: CB2 Excepted Wiring
CB2 input wiring is shipped with input power coming from the output terminals T2 and T3 of CB1.
Customers running at low voltage below 93% of nominal voltage and running the system at or near
maximum load may consider an excepted method for wiring CB2. The excepted method is to wire the
two input lines to CB2 directly from the input side L2 and L3 of CB1. This wiring change decrease the
load on CB1 and will not affect the system safety or performance. When the CB2 is wired in the
“excepted method”, wire and label “in accordance to local requirements”.
When CB2 wiring is completed, reinstall the finger guards.
Electric Shock
Contact with exposed electrical conductors may cause electric
shock and death or serious injury.
Replace all finger guards and protective covers for circuit breakers
and transformers, as provided, after electrical connections are
completed.
Figure 12-2: CB2 Input Wiring: Standard CB2 Wiring (left) and Excepted CB2 Wiring (right)
CB2
Standard
Input
Wiring
CB1
T2 and T3
Output
CB2
Excepted
Input
Wiring
CB1
L2 and L3
Input
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