3 — PROGRAMMABLE PARAMETERS
Curtis Model 1226 – September 2019
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pg. 40
Undervoltage Controller Menu
The Undervoltage Controller parameters allow you to configure how the controller handles
undervoltage conditions.
Note: To congure these parameters, you must be familiar with the controller’s system voltage ranges.
See Table 27.
e undervoltage controller is a closed loop PI (Proportional/Integral) controller that attempts to
keep battery voltage from drooping by cutting back the drive current.
e following table describes the Undervoltage Controller parameters.
BATTERY MENU — UNDERVOLTAGE CONTROLLER MENU
PARAMETER VALUES DEFAULT DESCRIPTION
User Undervoltage 0%-95% 80% Sets the undervoltage threshold. The value is a percentage of the
battery’s nominal voltage.
Kp UV 0-100% 20% Sets the undervoltage controller’s proportional gain. The value is
the desired percentage of cutback per volt. For example, a setting
of 25% provides full cutback with 4V of droop.
Ki UV 0-100% 0% Sets the integral gain for the undervoltage controller. The integral
gain accumulates the voltage droop and attempts to bring the
battery droop back to 0V. Higher gains will react more strongly
and quickly.
Note: Typically, the Kp UV and Ki UV parameters are congured
together to provide the best response. If the linear response of the
controllers is preferred, set Ki UV to 0%.
Overvoltage Controller Menu
e following table describes the parameter on the Overvoltage Controller menu.
Note: To congure the User Overvoltage parameter, you must be familiar with the controller’s system
voltage ranges. See Table 27.
BATTERY MENU — OVERVOLTAGE CONTROLLER MENU
PARAMETER VALUES DEFAULT DESCRIPTION
User Overvoltage 105%-200% 120% Sets the overvoltage threshold, which is the voltage at or above
which the controller cuts back regenerative braking to prevent
electrical damage.
The value is a percentage of the battery’s nominal voltage.
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