Xantrex Technology XG 850 manual Alarm Output Latching, 6Alarm Latch Bit Positions

Local Operation

Alarm Output Latching

When an alarm is triggered, the output will be disabled with the exception of the Fan alarm. When an alarm is cleared, the alarm output latch determines if the output should be re-enabled to the state before the alarm occurred or if the output should remain in the off state.

Where setting the bit position (1) of an alarm latch will result in output latching to the off state when the alarm is cleared and if cleared (0) output will be re-enabled to the state before the alarm triggered.

To define the values for the bit position you determine which alarms you want to latch. Read the value for this bit position from Table 3-6 and sum them together. The result is the alarm last mask. Which you should send with the SCPI command.

For Example:

If you wanted to enable latching for OTP and Foldback you would take the OTP value of 2 and add it to the foldback value of 256 to get a mask of 258. This is the value you would send with the SCPI command.

The output latches are accessible through the SCPI command.

The SCPI command (s) for these instructions are:

[:]SYSTem[<channel>]:PROTection:LATCh

The latch command take a single decimal parameter made up of the sum of the values for the alarms to determine if they are to be latched in the off state on clearing. See Table 3-6 for the values associated with each latchable alarm.

Table 3-6Alarm Latch Bit Positions

	Bit
Alarm	Position	Value
AC Fail	0	1
Over Temperature Protection (OTP)	1	2
Foldback	8	256

3-22 M370078-01