9146600990 Rev M
BE1-25A Testing
5-7
NOTE
If there is a slip rate, th e SYN C LED will b egin flashing (instead of extinguishing) as
synchronization is detected.
NOTE
Always load in all new bre aker timer setting s, a nd alw ays verify the active breaker by
mom entarily selecting item d from the MCU readings menu. (Breaker settings, unlike other
setting s, m ust be load ed b efore they can take effect.)
Step 2.
Set the GEN U V register to 40 Vac. Reduce the simulated generator voltage until the GEN UV LED
turns ON. This should occur as the simulated generator voltage goes below 40 ±1.5 Vac.
(Beginning here, the wo rd simulated shall be understoo d without repeating it.)
Step 3.
Return the GEN UV register to 110 Vac: the GEN UV LED should remain ON. Increase the
generator input voltage until the GEN UV LED turns OFF. This should occur as the input voltage
rises above 110 ±1.5 Vac.
Slip Frequency Verification Test
Step 4.
Set the G EN UV register to 40 Va c. Se t the M AX SLIP register for 0 .500 hertz .
Step 5.
Adjust the bus input a nd the ge nera tor inpu t to 120 Vac at 60.00 hertz.
Step 6.
Slo wly adjust the gene rator input fre quency lowe r. At 59 .49 ±0.01 hertz , the SLIP HIGH LED should
turn ON. Slowly move the generator frequency above and below the threshold and observe that the
LED acknowledges the slip frequency status within the stated tolerance.
Sync Signal Verification Test
Step 7.
With the bus input at 120 Vac, 60.00 hertz, adjust the generator input to 120 Vac at 59.90 hertz. Set
MAX SLIP (the #4 register) for 0.250 hertz. Rotate the GENERATO R SELECT control knob to the
generator position of choice. Set the register of the active breaker to 0.40 seconds.
Step 8.
Using an ex ternal syn chros cope , check that the S YN C LE D turns O N at 14 ±3°, and OF F at 0°. The
breaker closure output (as mon itored by a lamp (Figure 5-1), or an by oscilloscope (Figure 5-1))
should follow the SYNC LED.
Step 9.
Ins tall a jumper at the GF>BF jacks of the test module. The SYNC LED should immediately stop
flashing. Remove jumper to bring back the flashing SYNC LED . (The flashing is caused by the slip
rate. Note that (with this jumper applied) the generator frequency must be greater than that of the
bus for a sync output to be initiated.)
Step 10.
Return the display to MAX SLIP (the #4 setting). Use the DECREM ENT switch to reduce the setting
from the initial (0.250) value to 0.090. Use the LOAD switch to save the ne w M AX SLIP setting into
memory. Raise the LOCKO UT RESE T switch: the SYNC LED should cease flashing and the S LIP
HIGH LED should turn ON.
Step 11. Return the MA X SLIP s etting to 0.250 an d us e the LO AD sw itch to s ave the new MA X SLIP setting
into memory. The SYNC LED should resume flashing and the SLIP HIGH LED should turn OFF.
Step 12. Vary the bus and generator inputs over the range of 70-150 Vac. Vary the power supply over the
range of 90-132 Vac. Neither operation should affect the flashing rate of the LED.
Step 13.
Set the GENerator UnderVoltage setting (5) to 80 Vac. Reduce the generator output to 70 Vac, then
raise it until the UV LED just turns OFF. This should occur at 80 ±1.5 Vac.
Step 14. Rais e the generator voltage to 120 Vac, then reduce it to the value where the GEN UV LED just
turns ON. At this point, the generator input voltage should be 79 ±1.5 Vac.
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