3 — APPLICATION-SPECIFIC FEATURES
Curtis AC F4-A Motor Controller – August 2020 Return to TOC
pg. 28
Output-Disabled Region
is is a limited operation region. e output may be disabled and other functions may be disabled.
Motor operation is disabled. Displays may turn o and input devices stop working.
• Voltage recovery (> Severe Undervoltage) within 50 ms results in the resumption of
normal operations.
• Voltage recovery between 50 ms and 100 ms results in either automatic recovery or controller reset.
• Voltage recovery aer 100 ms results in a controller reset.
Brownout Voltage
e F-series controller model determines the brownout voltage. It is xed and not changeable.
When the controller’s keyswitch voltage falls into the brownout voltage region (33% > brownout ≥
0V), the controller bridge is switched o (i.e., motor current is stopped). e functions such as the
inputs, communications, and the external power supplies may also be disabled or go out-of-range.
Once in the brownout region, the controller will react accordingly should the brownout-voltage
condition recover:
• Voltage recovery within 5 ms results in automatic recovery.
• Voltage recovery between 5 ms and 100 ms results in either automatic recovery or
controller reset.
• Voltage recovery aer 100 ms results in a controller reset.
Note that KSI (pin 1) and the B+ terminal (when the main contactor is closed) are at battery voltage.
e controller’s capacitor-bank pre-charge is via KSI, as the pre-charge function is preformed prior
to the main contactor’s closure. An incorrect battery or parameter settings can trigger the various
under- and over-voltage faults and controller responses.
BATTERY DISCHARGE INDICATOR
e lead-acid battery discharge indicator (BDI) algorithm continuously calculates the battery state-
of-charge (SOC) from the keyswitch voltage (KSI, pin 1) whenever the main contactor is closed.
e result of the BDI algorithm is the variable BDI that is the state-of-charge percentage. e BDI
variable is viewable in the Programmer app’s System Monitor » Battery menu. When the controller is
powered-down (KSI o), the present BDI percentage is stored in nonvolatile memory.
For ooded lead-acid batteries and sealed maintenance-free lead-acid batteries, the standard values
for volts per cell are as follows.
Lead-Acid 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 these standard values for the battery’s starting point in setting the Reset, Full, and Empty Volts
Per Cell parameters (see the Programmer app, Application Setup » Battery Setup » BDI Setup menu).
Note: For non-lead-acid batteries, including Lithium-Ion battery packs, use the battery pack’s
or cell manufacturer’s approved Battery Management System (BMS) for determining the SOC.
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