Battery Menu - Curtis 1232E Manual

3 — PROGRAMMABLE PARAMETERS:
ALLOWABLE
PARAMETER RANGE
24 – 96 V
Nominal Voltage
Nominal_Voltage 1536 – 6144
0x3048 0x00
0.0 – 100.0 % / V
Kp UV
Batt_Kp_UV 0 – 1024
0x380E 0x00
0 – 100 %
Ki UV
Batt_Ki_UV 0 – 16384
0x380F 0x00
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Battery Parameters

BATTERY MENU

DESCRIPTION
Must be set to the vehicle's nominal battery pack voltage. This parameter is used
in determining the overvoltage and undervoltage protection thresholds for the
electronic system.
Overvoltage protection cuts back regen braking to prevent damage
to batteries and other electrical system components due to overvoltage.
Undervoltage protection prevents systems from operating at voltages below their
design thresholds.
The four threshold points are calculated from the Nominal Voltage, Under-
voltage Kp and Ki, User Overvoltage, and User Undervoltage parameter settings
and the controller's minimum voltage and maximum voltage ratings.
Overvoltage = Either Max Voltage (see Table D-1)
or User Overvoltage × Nominal Voltage, whichever is lower.
Severe Overvoltage = Overvoltage (see previous item) + 10V.
Undervoltage = Either Min Voltage (see Table D-1)
or User Undervoltage × Nominal Voltage, whichever is higher.
Severe Undervoltage = Either drive current cut back to 0% for 64 ms
or Brownout Voltage * (see Table D-1) is reached, whichever comes first.
* The Brownout Voltage is determined by the controller base type and cannot
be changed. When the capacitor voltage falls below the Brownout voltage the
bridge is switched off (i.e., motor current is switched off). If the capacitor voltage
stays below the Brownout voltage for > 64 milliseconds the controller will reset
(equivalent to cycling the keyswitch). If the capacitor voltage rises above the
Brownout voltage before 64 ms have passed the bridge will be reenabled.
The Severe Undervoltage point cannot be set lower than the Brownout voltage.
When the battery voltage goes below the undervoltage threshold
(as set above), a closed loop PI (Proportional/Integral) controller
is enabled in an attempt to keep the battery voltage from drooping.
It accomplishes this by cutting back the drive current, thereby
reducing the load on the battery.
The Kp term is the proportional gain and is set in units of
% cutback per volt; for example, a setting of 25 would provide full
current cutback with 4 V of droop.
The Ki term is the integral gain. Integral gain will accumulate
the voltage droop and attempt to bring the battery droop back
to 0 V. Higher gains will react more strongly and quickly.
Typically, Kp UV and Ki UV are used together to provide the
best response. If the linear response of the previous AC controllers
is preferred, set Ki UV = 0.
Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE Manual,
30
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