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High Temperature Compensation
The Slope Thermal Compensation feature of the controller must be Enabled for this feature to operate.
The controller will automatically detect and obtain temperature measurements from an attached
QS873 thermal probe. However, it does not automatically enable thermal compensation. A user must
configure the controller to Disable the Slope Thermal Compensation feature. Disconnecting thermal
probes will result in thermal probe failures. This alarm can be removed by issuing the Uninstall
Equipment operation through the Craft port or remote interfaces. Note: if STC is Enabled, removing all
thermal probes and issuing the Uninstall Equipment will still result in a Thermal Probe fail alarm. STC
must be Disabled to remove the alarm.
• V Step Down: The High Temperature Voltage Step Down Temperature threshold, shown as spt, is the temperature
at which the system controller will adjust the rectifiers to set the DC bus voltage down by another.17V per cell. This
battery step down temperature can be set from 45°C to 85°C. A 10oC hysteresis is built into this feature. The
factory default setting is 75°C.
• High Comp Limit: The High Temperature Compensation Limit, shown as utt, is the upper temperature thermal limit
at which high temperature thermal compensation is stopped and the system DC voltage is no longer decreased
according to the configured linear slope rate. This temperature threshold limit can be set from 30°C to 55°C. The
factory default setting is 45°C.
• Decrease: The high temperature decrease rate, shown as usp, establishes the linear slope rate that the controller
utilizes to decrease the system DC voltage from the configured nominal temperature value to the High
Temperature Compensation Limit. The high temperature slope setting (rate of decrease) can be set from - 1mV to
-10mV/oC per cell in -.1mV/oC per cell steps. The factory default is -3mV/oC per cell.
• Nominal Temperature: The nominal temperature, shown as ntt, is the battery temperature which there is no
battery voltage compensation. Slope Thermal Compensation will be active if the feature is enabled for
temperatures above or below this temperature threshold. The nominal battery temperature range is from 15° to
30°C. The factory default setting is 25°C.
Low Temperature Compensation
The battery Low Temperature compensation is a separate component of the overall controller’s
thermal compensation feature. Low Temperature compensation is Disabled by default, and can be
enabled only if Temperature Slope Thermal Compensation is enabled. The following are its associated
parameters.
• Low Temperature Compensation Enable: The Low Temperature Compensation Enable/Disable, shown as rve,
allows the feature to be active or disabled independently from High Temperature compensation.
• Low Comp Limit: The Low Temperature Thermal Compensation Limit, shown as (ltt), is the lower temperature
thermal limit at which low temperature thermal compensation is stopped and the system DC voltage is no longer
increased according to the configured linear slope rate. This temperature threshold limit can be set from-5°C to 20°
C. The factory default setting is 0°C.
• Increase: The low temperature slope increase rate, shown as lsp, establishes the linear slope rate that the controller
utilizes to increase the system DC voltage from the configured Battery Nominal Temperature value to the Low
Temperature Compensation Temperature Limit. The low temperature slope setting (rate of increase) can be set
from 1mV to 10mV/oC per cell in .1mV/oC per cell increments. The factory default setting is 3mV/oC per cell.
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