4 — PROGRAMMABLE PARAMETERS
Curtis AC F4-A Motor Controller – August 2020 Return to TOC
pg. 54
Figure 12 illustrates the Brake’s signal chain where the brake parameters are applied. Brake processing
is optional as it can be turned o by setting Brake_Pedal_Enable = O. When turned on, note that the
brake processing can be with or without VCL. When the controller is in Speed Mode, any non-zero
brake command will then override the throttle signal and the motor controller will brake to a stop
as determined by the Brake Current Limit parameter. When using a brake pedal, its input follows
a similar design to the throttle input with the major exception that it is always a unidirectional
deceleration command (provide regenerative commands only). There is no brake multiplier
parameter, although VCL may still inject its own command, replacing the normal connection from
the brake pedal inputs.
e brake signal chain illustrates the use of the controller’s analog potentiometer inputs, shown in
Figure 4 as a 2-wire brake pot. e input can also be a voltage input, using the common F-series
analog inputs congurations and the “source” in the IO Assignments Controls menu. In the diagram,
the brake signal ows le-to-right, passing through various gates to the Brake Command fed into
the motor control-processing block. Included in the diagram is the separation of the dual drive
manager and ancillary controller. Point B is where the dual drive manager controller generates
the brake command for the ancillary controller, for the ancillary’s points C and A . (Reference the
F-Series Dual Drive manual, supplement.)
Like the throttle, the output of the analog brake input is a percentage, not a voltage (Brake_Pot_
Percent). e mapping block uses the brake menu parameters (above), eventually feeding into the
brake lter (typically) and onto the motor control block. Notice that a VCL brake input eliminates the
analog inputs and mapping block (i.e., a VCL Brake will free up analog inputs for other purposes).
e brake signal passes through a limiter, which limits the brake signal to a range of 0–100% (0–
32767). Aer the limiter, the brake signal is a VCL variable called Mapped_Brake, which displays
as Mapped Brake in the System Monitor menu. Checking the value of Mapped_Brake is a good
way to see if the brake menu parameters are set correctly. A VCL program can control the brake by
changing the variable VCL_Brake (0x33D0 0x00). In Figure 12, notice that the decision gates are in
the analog-input to brake-command ow state. If the Brake Pedal Enable parameter is o, the brake
command is zero. If a fault action results in “fullbrake” then the brake command becomes 100%. e
Brake_Command (0x33D2 0x00) is a value of 0-100% (0 – 32767).
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