Xantrex DC XG 850 User Manual download pdf (Page 66)

Local Operation

3-22 M370078-01

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 3-6

Alarm Latch Bit Positions

Alarm

Bit

Position

Value

AC Fail 0 1

Over Temperature Protection (OTP) 1 2

Foldback 8 256

1 2 ... 61 62 63 64 65 66 67 68 69 70 71 ... 285 286

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Xantrex DC XG 850 User Manual Page 66