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IB140042EN
Instructional Booklet
Page
30
Effective: May 2015
ATC-300 /900 Breaker Based Transfer Switch
Section 6: Testing and Problem Solving
6.1 Testing
After the ATS equipment is initially installed or during planned out-
ages, the installation should be tested to ensure that all equipment
operates properly. This attention to detail will help avoid unex-
pected malfunctions. Mechanical and/or electrical tests should be
performed as described in this section.
The frequency of subsequent testing should be based on recom-
mendations of the Genset manufacturer. Use the test pushbutton
to check the electrical operation of the switch.
6.1.1 Mechanical and/or Electrical Testing
SINCE FEATURE 4 (TIME DELAY ENGINE COOL-OFF), AS DESCRIBED
IN SECTION 3, IS A STANDARD FEATURE, AN ENGINE START SIGNAL
WILL BE PRESENT FOR A PERIOD OF TIME WHEN THE SWITCH IS
FIRST ENERGIZED. THE PERIOD OF TIME IS EQUAL TO THE TIMER
SETTING. TO AVOID STARTING THE ENGINE DURING THIS TIME
PERIOD, TURN THE GENERATOR CONTROLS TO THE OFF POSITION.
Energize the ATS equipment as described in Sections 6.1.2
through 6.1.6. Insure that all safety precautions are taken and
that all
WARNINGS
and
CAUTIONS
are observed.
6.1.2 No Voltage Steps
With no voltage available on either power source, proceed as fol-
lows.
Step 1:
Check to make sure that both the Source 1 and Source 2
power switching devices are in the OPEN position. The
switching devices can be put into the OPEN position
using of the manual operating handle, stopping in the
NEUTRAL position.
Step 2:
The generator engine start controls should be in the OFF
position to prevent an undesired start.
Step 3:
Ensure that the ATS has been set to the proper applied
system voltage (See Section 4.8).
Step 4:
Check all ATS loads to ensure that they are ready to be
energized.
6.1.3 Connecting the Power Sources
Step 1:
Close the Source 1 power source upstream protection
device. The Source 1 power switching device should
close
Step 2:
Connect the engine start battery cable.
Step 3:
With the emergency generator in the OFF position, close
the Source 2 power source upstream protective device,
assuming such a device used.
Step 4:
Close any generator engine-start controls opened as a
result of actions taken in Step 4, Section 6.1.2.
Step 5:
Where required, use an accurate voltmeter to check
phase-to-phase and phase-to-neutral voltages present at
the transfer switch Source 1, Source 2, and/or load termi-
nals.
6.1.4 Operational Checks
Step 1:
Check to ensure that the Source 1 switching device is in
the CLOSED position. This should have been done in Sec-
tion 6.1.3, Step 1.
Step 2:
Initiate an automatic transfer operation from the Source 1
to the Source 2 power source by pressing the
<Engine
Test>
pushbutton two times.
Note:
The ATC-300 Controller provides the capability to set the Engine Test
function to:
1. No Load Engine Test;
2. Load Engine Test; or
3. Disabled.
The factory default is set to:
1. Load Engine Test
a.
After the Time Delay Engine Starting (TDES) has timed out,
the engine should start, run, and build up to normal voltage
and frequency.
b.
The transfer switch will transfer to the Source 2 power
source (the Source 1 switching device opens and Source 2
switching device closes) after the Time Delay Normal to
Emergency (TDNE) times out.
Step 3:
Initiate an automatic transfer operation back to the Source
1 power source by pressing the
<Engine Test>
pushbut-
ton one time.
1. After the Time Delay Emergency to Normal timer (TDEN)
has timed out, the transfer switch will transfer back to
the Source 1 power source (the Source 2 switching
device opens and the Source 1 switching device closes).
2. The Time Delay for Engine Cool-Off (TDEC - Feature 4)
will allow the engine to run unloaded for a preset time
after transfer to the Source 1 power source is com-
pleted.
WARNING
HIGH VOLTAGES ASSOCIATED WITH OPERATIONAL TRANSFER
SWITCH EQUIPMENT PRESENT A SHOCK HAZARD THAT CAN
CAUSE SEVERE PERSONAL INJURY OR DEATH. USE EXTREME CAU-
TION TO AVOID TOUCHING ELECTRICAL CONNECTIONS WHENEVER
INSPECTING OR TESTING THE EQUIPMENT.
IN ADDITION, IMPROPER OPERATION OF THE GENERATOR SET
PRESENTS A HAZARD THAT CAN CAUSE SEVERE PERSONAL
INJURY OR DEATH. OBSERVE ALL SAFETY PRECAUTIONS IN YOUR
GENERATOR SET OPERATIONS AND INSTALLATION MANUALS.
NOTICE
NOTICE
AT THIS POINT, AND PRIOR TO MAKING ANY ATTEMPT TO ENER-
GIZE THE ATS EQUIPMENT, THE ENGINE-DRIVEN GENERATOR
SHOULD BE OPERATED. IF NECESSARY, THE VOLTAGE REGULA-
TOR ON THE GENERATOR SHOULD BE ADJUSTED ACCORDING TO
THE MANUFACTURER’S RECOMMENDATIONS. THE ATS EQUIP-
MENT WILL RESPOND ONLY TO THE RATED VOLTAGE AND FRE-
QUENCY PROGRAMMED INTO THE CONTROLLER.
