4. HOW TO USE
19
4.3.6
Operation Mode and Standby Time Settings
Use the MODE DIP switch (S7) to set the operation mode and standby time.
Figure 4-8 Operation mode and standby time settings
Table 4-7 Settings
No. Setting
ON
OFF
SW1 Operation
mode NORMAL OVERRIDE
SW2
Standby time
Approx. 1 minute
Approx. 4 minutes
SW3 Not
used
-
-
SW4 Not
used
-
-
• Setting the Operation Mode
Normally, you can use the front-panel SYNC SOURCE key to switch the output signal, but
when there are errors in only one of the input signals (primary or backup), you cannot
switch to the signal that has errors.
If you set the operation mode to OVERRIDE, regardless of the state of the input signals,
you can use the SYNC SOURCE key to switch the output signal. However, this setting is
valid when AUTO SWITCHING is set to DISABLED. If AUTO SWITCHING is set to
SWITCH FAULT, even if you set the operation mode to OVERRIDE, you cannot switch to
the signal that has errors.
The factory default setting is NORMAL. Leave this set to NORMAL under standard
operating circumstances.
For details on the SYNC SOURCE key, see section 4.5.2, “Switching the Output Signal.”
For details on the AUTO SWITCHING key, see section 4.5.3, “Setting Automatic Signal Switching.”
• Setting the Standby Time
You can select the length of time that the LT 4441/4442 waits from the time that it turns ON
to the time that it begins operating. Select a setting that is appropriate for the rise time of
the system signal source that you are connected to.
The factory default setting is approximately 1 minute.
