Programming
98 900-0117-01-00 Rev B
Aux Modes for the Charge Controller
Aux Modes include nine options with automatic criteria. The options appear in the following order when
the wheel is drawn clockwise. The
Vent Fan
option appears first if the charge controller is set at factory
default values; otherwise, it will tend to display the last option selected. (The options are described in
greater detail in the charge controller Owner’s Manual.)
Vent Fan
enables the AUX output in response to high DC (battery) voltage. It can run a small fan to ventilate
the battery compartment to eliminate gases that result from battery charging.
This option has settable DC voltage parameters.
Figure 114 Vent Fan
PV Trigger
enables the AUX output any time the PV voltage exceeds the specified number. Among other
things, this can be used for an alarm or an emergency relay if the Voc runs dangerously high.
This option has settable DC voltage and time parameters.
Figure 115 PV Trigger
Error Output
responds to two emergency conditions: low battery or failure to charge. Low battery is defined
by a set point. Failure to charge is defined by the PV voltage failing to exceed 3 Vdc above the battery voltage
for 26 consecutive hours. This option usually indicates an array problem and is meant to trigger an alarm.
NOTE: This option is “Active Low” only. The AUX output is enabled as long as these conditions are not met. If
they are met, the output is disabled.
This option has settable DC voltage parameters.
Figure 116 Error Output
Set Points:
Enable Voltage
– Adjusts the high-voltage
setting at which the AUX output is enabled.
Set Points for
Error Output
:
Low Battery Voltage –
Adjusts the low-voltage
setting at which the AUX output is disabled.
Set Points for
PV Trigger
:
Enable Voltage
– Adjusts the high-voltage setting at which the
AUX output is enabled (assuming
Active High
).
Hold Time
– Adjusts the time delay after reaching the
Enable Voltage
setting, before the AUX output is enabled.
Active: High
or
Low
.
Active High
enables the AUX output
when conditions are met;
Active Low
disables the output when
the same conditions are met but enables it the rest of the time.