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TP-6461 1/08 26 Section 2 Controller Troubleshooting
2.4 System Settings
If the ATS does not recognize the source, check that the
source voltage and frequency settings on the controller
match the actual source parameters.
Compare the controller settings to the ratings on the
ATS
nameplate and to the measured source
parameters using the following instructions.
2.4.1 Controller Source Settings
Check the controller’s source voltage, frequency, and
phase settings. See the transfer switch Operation and
Installation Manual for instructions.
Check the controller settings and compare them to the
voltage rating, frequency rating, and number of phases
shown on the ATS nameplate.
The nameplate is
attached to the cover of the controller assembly, which is
mounted on the inside of the transfer switch door. See
Figure 2-3 for an illustration of the nameplate.
Note: The system voltage and frequency shown on the
ATS nameplate must match the Source N and
Source E voltage and frequency settings. Do not
enter settings that do not match the nameplate
ratings of the ATS.
GM21291
1
2
3
1. Model designation
2. Serial number
3. Factory-installed accessory numbers
4. Voltage rating
5. Frequency rating
6. Number of phases (single or three)
4
5
6
Figure 2-3 Typical Transfer Switch Nameplate
Use the procedure in Section 3.3.2 to measure the
source voltage, frequency, and phase rotation, and
compare the measured values to the controller settings.
Follow the instructions in the transfer switch Operation
and Installation manual to change the controller settings
if they do not match the measured source parameters.
2.4.2 Voltage and Frequency Pickup
and Dropout Settings
Figure 2-4 illustrates the relative values of the voltage
pickup and dropout settings. Typical frequency pickup
and dropout settings relate to the nominal source
frequency in a similar way.
If the source voltage rises above the overvoltage
dropout setting or falls below the undervoltage dropout
setting for a time longer than the debounce time, the
controller will consider the source as failed. The source
voltage must return to a level within the range of the
pickup values for the controller to recognize the source
as restored.
Choose pickup and dropout settings that allow a
tolerable variation in the source parameters to prevent
nuisance transfers caused by small changes in the
source voltage and frequency.
tp6460
Nominal Voltage
Undervoltage Pickup
Undervoltage Dropout
Overvoltage Pickup
Overvoltage Dropout
240 V
216 V
194 V
262 V
276 V
Figure 2-4 Relationship Between Voltage Pickup
and Dropout Settings (default settings
for 240 V system shown)