Kohler Curtis F Series User Manual

3 — APPLICATION-SPECIFIC FEATURES
pg. 35
Return to TOC Curtis AC F2-A, F4-A, F6-A Motor Controllers – FOS 4.5 – April 2022
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.
• After 5ms controller bridge is disabled, motor current shut off.
• After 64ms, CAN, external supplies and VCL execution is disabled, and the controller will
reset when voltage recovers.
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). 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:
• Aer 5ms controller bridge is disabled, motor current shut o.
• Aer 64ms, CAN, external supplies and VCL execution is disabled, and the controller will
reset when voltage recovers.
e 24V F2-A may brown out sooner based upon loads.
KSI and B+ Input
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 performed 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). 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.

Kohler Curtis F Series Specifications

General

Brand	Kohler
Model	Curtis F Series
Category	Controller
Language	English