Basler BE1-25A Instruction Manual - Functional Description
BE1-25A
FUNCTIONAL DESCRIPTION
, continued
Figure 3 - Function Block Diagram
5
when the power supply is operating. If the power supply
fails, the contact will drop out and provide a closed
contact.
The watchdog circuit checks that the microprocessor is
operational. If some transient condition has disrupted its
normal pattern of operation, the watchdog will reset the
microprocessor and reinitialize the program. The micro-
processor is then restarted on its main sequence.
If this reset operation occurs 3 times within a 60-minute
period (perhaps indicative of some hardware failure), the
microprocessor is stopped, effectively shutting down the
entire unit and activating the fail alarm. This condition
will remain until operating power is disconnected, then
reapplied.
Generator Undervoltage Indicator (GEN UV): Illumi-
nates when the generator voltage is less than the
defined level for operation of the synchronizer.
Slip High Indicator: Illuminates when the Slip Fre-
quency exceeds the max. slip setting.
Sync Indicator: Illuminates when the Auto-Sync output
contact is closed.
RELAY FAIL OUTPUT
The relay fail output includes both a power supply fail
function and a watchdog circuit function. The power
supply fail function is achieved by using a normally
closed (NC) output contact that is held in open state