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Instructional Booklet
Page 30 Effective: August 2014
ATC-900 Magnum Tranfer SwitchO&MManual
Figure 39. Transfer from Normal Switching Device to Normal Bypass Switching Device, Steps 9-11.
9. Open the Source 2 Bypass switch. The source 2 Bypass RED
light will no longer be illuminated.
10. Move the generator selector switch to the AUTO position.
11. The Source 2 Switching device is now back in automatic
operation.
7.3.3 Source 1 to Source 2 Bypass (Open Transition Only)
The Source 1 switching device can be isolated and bypassed to
source 2 by the following sequence:
1. Move the generator selector switch to the RUN position
because the load needs to be energized from the Source 2
power source.
2. Make sure that the Source 2 power source is available.
3. Remove J7 Plug from ATC-900 controller.
4. Open and rack out the Source 1 switching device manually
(see Section 6). The Source 1 isolated BLUE light will illumi-
nate and Source 1 position energized GREEN LED will no lon-
ger be illuminated.
5. Close the Source 2 bypass switching device manually. The
Source 2 bypass RED light will be illuminated.
6. Inspect and/or perform the needed maintenance on the
Source 1 switching device.
7. Rack in the Source 1 switching device (see Section 6). The
Source 1 switching device will automatically recharge when it
is in the CONNECT position. The Source 1 isolated BLUE light
will no longer be illuminated.
Note: Source 1 switching device will not be closed with Source 2 bypass
switching device closed due to mechanical interlock.
8. Reconnect J7 plug back onto the ATC-900 controller.
9. Open the Source 2 bypass switching device. The Source 2
bypass RED light will no longer be illuminated.
10. The Source 1 switching device should now automatically
close and Source 1 position energized GREEN LED will be illu-
minated.
11. Move the generator selector switch to the AUTO position.
12. The Source 1 switching device is now back in automatic oper-
ation.
7.3.4 Source 2 to Source 1 Bypass (Open Transition Only)
The Source 2 switching device can be bypassed to source 1 by
the following sequence:
Note: This operation can be performed by programming Preferred
Source=Source 2 inside the ATC-900 controller
1. Ensure that the Source 1 power is available since the load will
be energized from the Source 1 power source.
2. Move the generator selector switch to the OFF position to
avoid nuisance starting of the generator while work is being
performed on the Source 2 switching device.
3. Remove J7 PLug from ATC-900 controller.
4. Open and rack out the Source 2 switching device manually
(see Section 6). The source 2 isolated BLUE light will illumi-
nate and Source 2 position energized RED LED will no longer
be illuminated.
Cutler-Hammer
Digitrip 3000
Operational
High Load
Communications
Trip
Time Overcurrent
Curve Shape
Pickup (x In)
Time Multiplier
Pickup (x In)
Time
Program
Phase
Ground
I
I
I
RMS Amperes
Settings/Test Time/Trip Cause
Test
Program
Test
Pickup (x In)
Instantaneous
Short Delay
Amp Demand
I
Cutler-Hammer
Phase
Phase
Phase
Phase
Ground
Digitrip 3000
Operatio
High
Commun
Time Overcurrent
Curve Shape
Pickup (x In)
Time Multiplier
Time
Program
Phase
Ground
RMS
Settings/Test
Time/Trip Cause
Short Delay
Cutler-Hammer
Digitrip 3000
Operational
High Load
Communications
Trip
Time Overcurrent
Curve Shape
Pickup (x In)
Time Multiplier
Pickup (x In)
Time
Program
Phase
Ground
I
I
I
RMS Amperes
Settings/Test Time/Trip Cause
Test
Program
Test
Pickup (x In)
Instantaneous
Short Delay
Amp Demand
I
Cutler-Hammer
Phase
Phase
Phase
Phase
Ground
Digitrip 3000
Operatio
High
Commun
Time Overcurrent
Curve Shape
Pickup (x In)
Time Multiplier
Time
Program
Phase
Ground
RMS
Settings/Test
Time/Trip Cause
Short Delay
9
Source 1
10 & 11
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