Electrical Operation; Transfer Mechanism; Main Contacts At Normal (Utility) - Generac Power Systems GTS "W" Owner's Manual

3.4

ELECTRICAL OPERATION

Test transfer system electrical operation as follows:
1. On the Utility Voltage Sensor circuit board, check
that the UTILITY ON lamp (LED) is ON.
2. On the enclosure door, check that the Switch
Position-Utility LED is ON.
The UTILITY ON lamp (on circuit board) and the
!
SWITCH POSITION-UTILITY LED ( on enclosure
door) must both be ON before proceeding to
Step 3.
3. Refer to the appropriate owner's manual. Be sure
the standby generator is prepared for automatic
operation.
4. In the switch enclosure, set the Maintenance
Disconnect switch to AUTOMATIC.
5. Set the Mode Switch to its NORMAL TEST MODE
position. Generator startup and transfer to the
STANDBY power source should occur. Refer to the
SEQUENCE OF OPERATION, Section 3.13.
All systems are equipped with the Inphase Monitor
Control board, and advisory lights on the circuit
board will light up to indicate operation of the vari-
ous solid state timers that control automatic opera-
tion. By observing these lights (LED's), the operator
can check the automatic operating sequences and
times. See SENSOR AND TIMER ADJUSTMENTS,
Section 3.16. For a detailed description of the auto-
matic operating sequences, see SEQUENCE OF
OPERATION, Section 3.13.
6. When the test is complete, return the Mode Switch
to its AUTOMATIC MODE position. Retransfer back
to the UTILITY (normal) power source. The genera-
tor should shut down according to circuit board
timers.
3.5

TRANSFER MECHANISM

• The transfer mechanism houses the main, current
carrying contacts, along with other mechanical and
electrical components required for operating the
switch (Figure 3.2). Main contacts are actuated by a
single solenoid, are electrically operated and mechan-
ically held. Power for that coil's operation is taken
from the side to which the LOAD is being transferred.
Thus, transfer to any power source cannot occur
unless that power source is available to the switch.
• LOAD or "T" contacts, bolted to an insulated plastic
pole piece are stationary. The NORMAL (utility) and
STANDBY (emergency) contacts are moveable. The
contacts are actuated by means of a closing coil and
mechanical linkage. The pole assemblies which
retain the stationary moveable main contacts are
sandwiched together and retained by thru-bolts.
Either 2, 3 or 4-pole assemblies may be used to form
a 2, 3 or 4-pole mechanism.
NOTE:
Section 3 — Operation
Generac GTS "W" Type Transfer Switch
Figure 3.2 — The Transfer Mechanism
3.6 MAIN CONTACTS AT NORMAL
(UTILITY)
The illustration shows the LOAD terminals connected to
the NORMAL (utility) terminals. window "A" will display
the word "ON"; Window "B" the word "OFF" (Figure
3.3).
Figure 3.3 — Main Contact at Normal (Utility)
Generac ® Power Systems, Inc. 9