Xantrex Technology XDI2048 - Manual (Page 51)

Protections and Alarms
TM-DIOP-01XN-01 3-9
Over Temperature Protection (OTP)
This feature protects critical components from failure due to temperature
stress should a fan fail or the ambient temperature or internal temperature
exceed acceptable levels. This module also controls the fans, turning them
on when internal temperatures exceed 35°C and increasing fan speed in
proportion to increase in temperature. When an OTP event occurs, the
Inverter shuts down and the fault flag is set on the front panel and user-
line port. Fans maintain operation at maximum speed until internal heat-
sink temperatures drop below 70°C at which point the inverter re-starts.
Short-circuit Protection
The inverter output is short-circuit proof. The DSP detects a sustained
short-circuit (greater than 2 seconds) and shuts down the inverter to
protect the load. The inverter will attempt to power the load a total of
three times in a 4-second window before permanently shutting down.
After clearing the load fault, normal operation can be restored (see “To
Clear an Alarm” on page 3–11).
Over-Current protection
The inverter can reliably deliver up to 50 A of peak current without
tripping any protections. Two levels of protections are provided. The first
level of protection is hardware based, providing peak current clipping at
50 A. Should the current exceed this (e.g. in the event of severe back-
feed) the DSP forces the inverter to skip a line cycle. Three consecutive
line cycle skips will force a reset of the inverter where the output is
temporarily disabled for about 4 seconds or until the back-feed falls away.
Internal Diagnostics
Upon power-up or fault event, the inverter executes a sequence of internal
diagnostics checking for compatible conditions at the DC input, output
and selected internal modules. Different alarms cause execution of
differing diagnostic sequences. All preceding fault conditions are
continuously monitored as part of the internal diagnostics routine. In
addition, the internal bus voltage, which is the inverter voltage source is
also monitored. The diagnostic module checks to ensure this is within
limits at start-up and continuously during normal operation. A failure of
this bus sets the fault flag on the front panel and user-line port and
disables the inverter. Normal operation resumes when within limits.