User guide

TS 870 TRANSFER SWITCH
PM062 REV 5 08/05/05 4 Thomson Technology
To change the transfer switch voltage, refer to “INSTRUCTIONS TO CHANGE SYSTEM
VOLTAGE ON TS870 SERIES TRANSFER SWITCHES WITH TSC 80
CONTROLLER” (attached as “Appendix B). Contact Thomson Technology for further
information as may be required.
3.4. SYSTEM PHASING-HIGH LEG DELTA SYSTEMS
For systems using high leg delta 240V 3 phase 4 wire systems, connection of supply
conductors must have the correct phasing as shown below.
WARNING
Failure to match correct system
phasing will result in serious damage
to the TSC 80 controller.
208V
B
(O range)
(High Leg)
C
(Yellow)
A
(R ed)
N
(W hite)
PH A
(UA)
Automatic Transfer
Switch (Utility Supply)
PH B
(UB)
PH C
(UC)
Neural
(N)
120V 120V
240V 240V
Where transfer switches are supplied without power isolation transformers (PT1 &
PT2) for ATS control logic it is essential that the orientation of phase conductors of