Basler Electric DECS-100 - Manual (Page 65)

9287500991 Rev M DECS-100 BESTCOMS™ Software 5-13
Protection Settings
The Protection Settings screen consists of two tabs: Protection and Limiter. Click the Protection button to
access the Protection Settings screen or click Screens on the menu bar and click Protection Settings.
Protection Tab
Protection settings are shown in Figure 5-14 and are described in the following paragraphs.
Generator Overvoltage - Voltage Level (%). The value of this field is expressed as a percentage of the
nominal generator voltage and determines the level of generator voltage required to initiate a generator
overvoltage condition. An overvoltage percentage value of 100 to 120 percent may be entered in 1
percent increments. A generator overvoltage condition lights the Generator Overvoltage LED on the front
panel.
Generator Overvoltage – Alarm Time Delay (sec). This setting establishes the length of time that a
generator overvoltage condition must exist before the DECS-100 annunciates the condition.
Figure 5-14. Protection Settings, Protection Tab
Generator Overvoltage - Hardware Shutdown. Enabling Hardware Shutdown will cause the DECS-100 to
remove field excitation when the generator overvoltage setting is exceeded. Disabling Hardware
Shutdown prevents the DECS-100 from removing excitation during a generator overvoltage condition.
Generator Overvoltage – Alarm. This setting enables and disables closure of the DECS-100 Alarm output
(terminals AL1 and AL2) during generator overvoltage. Disabling the alarm also disables hardware
shutdown.
Field Overvoltage - Voltage Level (Vdc). The value in this field is adjustable from 0 to 250 Vdc and
determines the field voltage level that will cause the DECS-100 to issue an overexcitation limit alarm.
When the field voltage increases above the value of this field for 10 seconds, the Overexcitation
Shutdown LED on the front panel lights.
Field Overvoltage - Alarm. If the Alarm is enabled and a field overvoltage condition exists for 10 seconds,
the DECS-100 Alarm output (terminals AL1, AL2) will close. Disabling the Alarm prevents the Alarm
output from closing when a field overvoltage condition exists. Disabling the alarm also disables hardware
shutdown.
Field Overvoltage - Hardware Shutdown. When Hardware Shutdown is enabled, the DECS-100 will
remove field excitation when a field overvoltage condition exists for 10 seconds.
Loss of Sensing Voltage - LOS Option. One of two DECS-100 responses can be selected for a loss of
sensing voltage condition. Selecting Shutdown Regulator will cause the DECS-100 to remove field
excitation when loss of sensing voltage occurs. Selecting Transfer To FCR will cause the DECS-100 to
transfer to FCR mode when a loss of sensing voltage occurs.