Curtis 1238SE - Battery Menu

4 — PROGRAMMABLE PARAMETERS
Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017 Return to TOC
pg. 62
BATTERY MENU
PARAMETER ALLOWABLE RANGE DESCRIPTION
Nominal Voltage
Nominal_Voltage
0x3048 0x00
24 – 96 V
1536 – 6144
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. See page 25 for Over, Under, and
Brownout voltage denitions and constraints.
NOTE: In all cases the OS default Nominal Voltage is the highest value
in the controller’s range (See Table D-1). Always check and adjust this
parameter whenever using a lower nominal voltage. Scaling is 64 counts
per volt.
For example, controller 1238E-65XX has a 48–80 voltage range.
Therefore, when using a 48 volt battery, the Nominal_Voltage parameter
will be 3072 (64 × 48 = 3072) in your VCL program, or as the raw
(decimal) value in TACT.
Kp UV
Batt_Kp_UV
0x380E 0x00
0.0 – 100.0% / V
0 – 1024
When the battery voltage goes below the undervoltage threshold (page 25),
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.
Ki UV
Batt_Ki_UV
0x380F 0x00
0 – 100%
0 – 16384
User Overvoltage
User_Overvoltage
0x3049 0x00
105 – 200%
269 – 512
The value of this parameter is a percentage of the Nominal Voltage setting.
The User Overvoltage parameter can be used to adjust the overvoltage
threshold, which is the voltage at which the controller will cut back regen
braking to prevent damage to the electrical system.
Typically this parameter is changed only when the controller is being used
in an application at the low end of the controller’s range: such as
a 48–80V controller being used in a system with a 48 V battery pack. In
this case, the overvoltage threshold can be raised by setting the User
Overvoltage to a higher value. The overvoltage threshold can never be
raised above the controller’s power base maximum voltage rating.
User Undervoltage
User_Undervoltage
0x304A 0x00
0 – 95%
0 – 242
The value of this parameter is a percentage of the Nominal Voltage setting.
The User Undervoltage parameter can be used to adjust the undervoltage
threshold, which is the voltage at which the controller will cut back drive
current to prevent damage to the electrical system.
Typically this parameter is changed only when the controller is being
used in an application at the high end of the controller’s range: such as
a 24–36 V controller being used in a system with a 36V battery pack. In
this case, the undervoltage threshold can be lowered by setting the User
Undervoltage to a lower value. The undervoltage threshold can never be
lowered below the controller’s power base minimum voltage rating.