2-8
BE1-25A Human-Machine Interface
9146600990 Rev M
Figure 2-5. Module A2
Figure 2-4. Module A1
Voltage Acceptance Module A2
Voltage Acceptance Module A2 can use as many as three voltage parameters to add constraints to the
issuance of breaker command signals. This option or option A1 is a prerequisite of, and a controller of, any
voltage matching option that may be present. Figure 2-5 illustrates the following descriptions.
1.
The UPPER LIMIT control establishes a maximum bus voltage. No closure is to be attempted when the
bus voltage is above the upper limit.
2.
The LOWER LIMIT control establishes a minimum bus voltage. No closure is to be attempted when the
bus voltage is below the lower limit.
3.
The VOLTAGE DIFFERENCE control establishes the maximum acceptable voltage difference between
the two sides of the circuit breaker (generator voltage minus bus voltage). No closure is to be attempted
when the circuit breaker voltage difference is greater than the set limit. The voltage difference is
continuously variable over the range of 1 to 10 Vac.
An LED to the left of each control lights whenever the associated parameter is beyond the range set by the
control. As a result, the breaker closure is inhibited.
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