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TS 850 TRANSFER SWITCH
.
5.2.
SERVICE ENTRANCE AUTOMATIC TRANSFER SWITCH
(Note: This applies only to service entrance transfer switches supplied with a
Padlockable Disconnect Switch. Contact TTl for other types.)
5.2.1.
NORMAL
OPERATION
·Under cnorma1 conditions, the load is
:-energiz~d
from the utility supply through the
closed utility transfer breaker. If the utility power fails, the generator will start and the
load will be re-energized via the closed generator transfer breaker.
In the normal operating mode, the Service Disconnect switch shall be in the
"energized" position.
5.2.2.
SERVICE
DISCONNECT PROCEDURE
To perform a service disconnect (i.e. to disconnect the utility and generator supplies),
the following procedure is required:
1.
Move the "Service Disconnect" control switch located on the door of the transfer
switch to the "Disconnected" position.
2. Verify that the
"Service
Disconnected" pilot light is
illuminated.
If the Light
is
illuminated, the service has been successfully disconnected and it
is
safe to perform
any maintenance procedures as required. In this condition, the transfer switch
is in
the neutral position, with both utility and transfer breakers open. The transfer switch
will remain in this condition, regardless of condition of the utility and generator
supplies (i.e. if the utility power fails, the generator will not receive a start condition,
nor will the transfer switch move to the generator position). If the Light
is
not
illuminated, further procedures are required (refer to the following procedure #4).
3.
Attach safety lockout padlock to the "Service Disconnect" control switch to prevent
unauthorized change in operating condition and verify transfer switch door is locked
closed. If the door is not locked, turn and remove door key.
4. If the "Service Disconnected" pilot light is not illuminated, the service will not have
been
successfully
disconnected
and
it is therefore
not safe
to perform
any
maintenance until the following additional procedures are performed:
Warning
,
·
rj£irspnp~l
~:;,,-nus(,::,·un~~ii~k.~· -
PM042 Rev
7
01/1.0/17
,_.
_____
,·.
·
TfJomson Technology
Inc.
·
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