9146600990 Rev M
BE1-25A Human-Machine Interface
2-1
SECTION 2 • HUMAN-MACHINE INTERFACE
CONTROLS AND INDICATORS
A basic BE1-25A Synchronizer (without options) is shown in Figure 2-1 and described in Table 2-1. Figure
2-2 shows the Test Module in its offset position as required for testing. The remaining figures describe the
various options currently available.
Table 2-1. BE1-25A, Controls and Indicators (Refer to Figures 2-1 and 2-2)
Locator
Control or Indicator
Function
A
GENERATOR SELECT
Control
When the Test Module is in the test position (as in Figure 2-
2), this control selects one of the six possible generator
operation times that are stored in the memory of the MCU
Sync module. This selection process allows the stored
constant for a particular generator to be employed as a
reference for test purposes. This control has no function
when the Test Module is in the operate position (as shown
in Figure 2-1.)
B
Test Jacks
When the Test Module is in the test position (Figure 2-2),
the tip jacks facilitate testing in the following described
manner. When the Test Module is in the normal position
(Figure 2-1), certain jacks serve as monitoring points as
described in the following paragraphs.
Starting from the top, the seven pairs of jacks are:
1. BUS voltage. When test module is in test position, a
simulated bus voltage can be injected for test purposes. In
normal position, monitors the bus voltage.
2. GENerator voltage. When test module is in test position,
allows a simulated generator voltage to be injected for test
purposes. In normal position, allows the generator voltage
to be monitored.
3. POWER. When the test module is in test position, allows
the specified operating power (i.e., 85-135 Vac @ 50/60 Hz,
or 70-150 Vdc) to be supplied to the BE1-25A relay. (This
power was automatically disconnected by the act of placing
the module into the test position.) In the normal position,
allows the supply voltage to be monitored (i.e., terminals 21
and 22 of TB1).
4. 52b. When the test module is in test position, provides a
means of simulating a 52b contact closure (by applying a
jumper or closing a switch across these jacks). In the
normal position, allows the 52b contact input to be
monitored. (Measures approximately 100 Vdc when the 52b
contact input is open, 0 Vdc otherwise.)
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