pg. 25
Return to TOC Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017
3 — APPLICATION-SPECIFIC FEATURES
VOLTAGE LIMITS
e controller establishes both hardware-based voltage limits and parameter-based user dened
limits. 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
e four threshold points are calculated from the Nominal Voltage, Undervoltage Kp and Ki, User
Overvoltage, and User Undervoltage parameter settings and the controller’s minimum voltage and
maximum voltage ratings. Note that both the KSI (pin 1) and the B+ terminal (when the main is
closed) are at battery voltage, and the capacitor bank is precharged via KSI prior to the main closure.
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 rst.
* e Brownout Voltage is determined by the controller base type and cannot be changed. When
the controller's capacitor voltage falls below the Brownout voltage the bridge is switched o (i.e.,
motor current is switched o). 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 re-enabled. e Severe
Undervoltage point cannot be set lower than the Brownout voltage.
BATTERY DISCHARGE INDICATOR
e lead-acid battery discharge indicator (BDI) algorithm continuously calculates the battery state-
of-charge from the B+ voltage, whenever the main contactor is closed. e result of the BDI algorithm
is the variable BDI Percentage, which is viewable in the 1313/1314 menu Monitor » Battery. When
KSI is turned o, the present BDI Percentage is stored in nonvolatile memory.
The standard values for volts per cell are as follows, for flooded lead-acid batteries and sealed
maintenance-free lead-acid batteries.
Battery Type
Flooded Sealed
Reset Volts Per Cell 2.09 2.09
Full Volts Per Cell 2.04 2.04
Empty Volts Per Cell 1.73 1.90
Use the standard values for your type of batteries as the starting point in setting the reset, full,
and empty volts-per-cell parameters. Note: For non lead-acid batteries, including Lithium-Ion
battery packs, use the pack's or cell manufacturer's approved Battery Management System (BMS)
for determining BDI.
Quick Links:
Controller voltage
ratings p.147
User/parameter voltage
limits p.62
To Next Page
Loading...
