Kohler KEP User Manual

TP-6745 7/10 25Section 2 Troubleshooting
Use the procedure in Section 2.4.2 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.
2.5.2 Voltage and Frequency Pickup
and Dropout Settings
Figure 2-6 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.
tp6460
Nominal Voltage
Undervoltage Pickup
Undervoltage Dropout
Overvoltage Pickup
Overvoltage Dropout
240 V
216 V
194 V
262 V
276 V
Figure 2-6 Relationship Between Voltage Pickup
and Dropout Settings (default settings
for 240-volt system shown)
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.
Voltage Sensing
Parameter Default
Adjustment
Range
Undervoltage dropout 90% of pickup 75%--98%
Undervoltage pickup 90% of nominal 85%--100%
Overvoltage dropout * 115% of nominal* 106%--135%
Overvoltage pickup 95% of dropout 95%--100%
Unbalance enable Disable Enable/Disable
Unbalance dropout 20% 5%--20%
Unbalance pickup 10% 3%--18%
Voltage dropout time 0.5 sec. 0.1--9.9 sec.
* 690 volts, maximum. Default = 110% for 600 volt applications.
Figure 2-7 Voltage Settings
Frequency Sensing
Parameter Default
Adjustment
Range
Underfrequency
dropout
99% of pickup 95% --99%
Underfrequency pickup 90% of nominal 80%--95%
Overfrequency dropout 101% of pickup 101%--115%
Overfrequency pickup 110% of nominal 105%--120%
Frequency dropout time 3 sec. 0.1--15 sec.
Figure 2-8 Frequency Settings

Kohler KEP Specifications

General

Brand	Kohler
Model	KEP
Category	Switch
Language	English