Operating instructions

22 Operating Instructions
Setpoints
The Setpoints screen is used to adjust the user-accessible switch settings. To limit access to the
settings to qualified personnel, Security Access is required to make changes to the settings. The
retranslate delay settings are the time delays in auto retranslates back to the preferred source
after the preferred source is restored. The phase difference setting is the allowable phase differ-
ence between the input sources before disabling manual or auto retranslates. The frequency devi-
ation setting is the allowable frequency variation from nominal (60.0 or 50.0 Hz) before activating
the frequency deviation alarm. The frequency setting applies to both input sources. The auto
retransfer enable setting allows enabling or disabling the auto retransfer feature of the switch
back to the preferred source after the preferred source is restored. The transfer counter reset
resets the Monitor/Mimic screen transfer counter to zero.
Figure 22 Setpoints Screen
Source Transfer/Preferred Source Select
The Source Transfer screen is used to manually initiate a switch transfer to the other source by
changing the preferred source selection. Transfer instructions are included on the Source Trans-
fer Screen, shown below.
Figure 23 Source Transfer Screen
EXIT
SECURITY ACCESS
CURSOR UP
CURSOR DOWN
CHOOSE
UP :
DOWN :
SELECT :
SETPOINTS
3
8
15
5
YES
Retransfer Delay (Sec.)
Retransfer Voltage Diff. (%)
Phase Difference (Degrees)
Frequency Deviation (0.1 Hertz)
Auto Retransfer Enabled
NO Transfer Counter Reset
OKAY TO TRANSFER
SOURCE2 LEAD = 2 Deg
SOURCE1 -
SOURCE2 -
480
480
480481
B-CA-B
VOLTAGE COMPARISON
SELECT : MASTER MENU
SOURCE1 IS PREFERRED
+30
ON SOURCE1
60.0 Hz
479
C-A
FREQUENCY
TRANSFER INSTRUCTIONS
1. Verify CB2 is closed, SOURCE2 voltages are correct,
and sources are within synchronization window.
2. If the OK TO TRANSFER message is displayed,
simultaneously press the ALARM RESET and DOWN
buttons.
3. Verify that the transfer was successful by checking the
ON SOURCE status message.
4. If TRANSFER PROHIBIT message is displayed, check
for alarm messages on the “MONITOR/MIMIC” screen.
SYNCHRONIZATION
60.0 Hz
0-30
480