Comtech EF Data LCS-4 - Manual (Page 63)

LCS-4 L-Band Combiner Switch Revision 1
Front Panel Control MN/LCS4.IOM
7.3.3 LNB V
OLTAGE
/C
URRENT
T
URN
ON
Contact Comtech EF Data Customer Support for a procedure for setting the CAL current for the
LNB in the event it uses an internal ovenized oscillator. These units draw a higher current at turn
ON of the LNB voltage in order to heat up the crystal. After warm-up, the current drops back to
the normal steady-state value.
7.3.4 ODU/BUC
OR
LNB O
NLINE
S
WITCH
Note: User shall use ODU/BUC or LNB Switch with indicator contacts.
The RED condition indicates the ODU Switch has failed. The switch has a set of indicator
contacts that are read by the unit controller to determine the position of the switch. When the A/B
indicator does not agree with the programmed position:
• Contact Comtech EF Data for a procedure to correct the problem.
• A RED failure is activated if it is not possible to correct position of the switch.
7.4 F
AULT
D
EFINITIONS FOR
S
WITCHOVER FOR
LNB
OR
ODU/BUC
Table 7-1. Fault Definitions for Switchover for LNB or ODU/BUC
Characteristics
TX Faults BUC Power Supply HI or Low Voltage Alarm
BUC Current HI or Low Current Alarm
RX Faults LNB Power Supply HI or Low Voltage Alarm
LNB Current HI or Low Current Alarm
Common Faults 10 MHz failure – reference to the BUC or LNB is compromised.
Shut off the 10 MHz to the BUC and LNB
Switchover Time Less than 1.5 second following fault detection.
Automatic Switchover The starting point assumes both units are good. When a fault
occurs in the ONLINE unit, it is replaced only with a functional
standby unit. No switching occurs if both units have failed.
Manual Switchover From front panel or remote port.
Modulator TX Carrier ON/OFF Unit senses modulator faults and applies control (bypasses UP)
to turn TX carrier Off at modulator for up to four modulators.
7–7