TS 870 Transfer Switch
PM062 REV 11 16/04/19
42
Thomson Power Systems
MANUAL TRANSFER TO UTILITY SUPPLY (Open Transition)
To transfer manually to the utility supply, follow procedure listed below;
1. Turn the Transfer Switch door mounted System Operation Mode selector to
MANUAL or Select MAN mode on TSC 900 Controller (refer to TSC 900
manual for further information).
2. Manually open the generator power switching device using the red (O)
Mechanical Open pushbutton located on the face of the power switching
device. Refer to Diagram #1. Verify the generator power switching device
contacts are open via Green (O) open contact status flag.
3. Ensure the utility power switching device’s spring mechanism is fully charged
as indicated by yellow –Charged OK flag. If the power switching device is not
charged, it maybe manually charged by locating the manual charge handle
mechanism on the face of the power switching device, then pulling forward
and then down 1-4 times until the yellow Charged OK flag is displayed. Refer
to diagram #1 and the power switching device’s manual for further
information.
NOTE
The yellow OK Flag indicates the power switching device
is charged however it may not be ready to close if the
transfer switch mechanical or electrical interlocks are not
satisfied
4. If the utility supply is at normal voltage and frequency levels, manually Close
the utility power switching device using the black (I) Mechanical Close
pushbutton located on the face of the power switching device. Refer to
Diagram #1. Verify the utility power switching device contacts are closed via
red (I) closed contact status flag.
NOTE:
If the Transfer Switch is supplied with Closed Transition
Transfer feature, the mechanical close push button on the
face of the power switching unit is not available for use. A
separate electrical close push button located on the power
switching unit door is provided for manual closing. Power
switching unit closure is only permitted in open transition
mode (i.e. Gen power switching device must be open)
Summary of Contents for TS 870
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