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TS 870 Transfer Switch
PM062 REV 11 16/04/19
29
Thomson Power Systems
6. To re-energize the load, remove the padlock(s) from the service disconnect
control switch, and move the switch to the Energized position. The transfer
switch will immediately return to the utility or generator supply if within normal
operating limits.
5.4.5. ADDITIONAL SERVICE DISCONNECT PROCEDURES (MO STYLE
ATS MECHANISM)
If the Service Disconnected pilot light is not illuminated, the service will not have been
successfully disconnected and therefore it is not safe to perform any maintenance until
the following additional procedures are performed:
DANGER
Arc Flash and Shock Hazard. Will cause severe injury or death. Do not open
equipment until ALL power sources are disconnected.
This equipment must be installed and serviced only by qualified electrical
personnel utilizing safe work practices and appropriate Personal Protective
Equipment (PPE). Failure to do so may cause personal injury or death.
1. Visually inspect the actual position of the transfer switch power switching
devices. If both power switching devices indicate they are open, the transfer
switch is clearly in the Neutral position, the service has been successfully
disconnected. Proceed to Step. 4.
If either power switching device is not in the Open position, or the load bus is
energized, further procedures are required.
NOTE:
If the power switching devices are both Open, the Service Disconnected
pilot light may not have illuminated due to the following reasons:
a) Utility and generator supply voltages are not present (the TSC 900
requires AC supply voltage to be present to power the pilot light).
b) The pilot light may be burnt out. The bulb should be immediately
replaced with a 6Vdc rated LED bulb.
b. Failure of one or more of the sensing/logic contacts. A qualified service
technician is required to trouble shoot this specific condition. Switch the
utility control circuit isolation switch to the de-energized position to remove
utility control power. To isolate the ATS Power Chassis & Voltage Sensing
circuits, remove the isolation plugs PL12 and PL15.
NOTE:
The AC power conductors will still remain energized. Once all the
control and voltage sensing circuits are de-energized and isolated the
Summary of Contents for TS 870
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