4 — PROGRAMMABLE PARAMETERS
Curtis AC F4-A Motor Controller – August 2020 Return to TOC
pg. 68
APPLICATION SETUP — EM BRAKE CONTROL MENU, cont’d
PARAMETER ALLOWABLE RANGE DEFAULT DESCRIPTION
Set EM Brake On Fault
EM_Brake_Set_Upon_Fault
0x3475 0x00
On/Off
On/Off
On When programmed On, the controller’s operating system will
stop the assigned EM Brake's coil driver whenever a fault occurs
that has the ShutdownEMBrake fault action. The de-energize
electromagnetic brake coil engages the EM brake (“drops the
EMbrake”).
Zero Speed Threshold
Zero_Speed_Threshold
0x30F2 0x00
5 – 100 rpm
5 – 100
30 rpm Determines the speed below which the EM brake is set (On).
Setting this speed too high may cause a jerky stop when the EM
brake sets and stops the motor rotation.
This parameter appears twice in the menu structure. Changing
the value of this parameter affects this (same) parameter in the
Position Hold menu.
Zero Speed Threshold Time
Zero_Speed_Threshold_Time
0x30F3 0x00
0 – 480 ms
0 – 60
32 ms Determines how long motor speed must be below Zero_Speed_
Threshold to declare zero speed.
This parameter appears twice in the menu structure. Changing
the value of this parameter affects this (same) parameter in the
Position Hold menu.
Position Hold Settling Time
Position_Hold_Settling_Time
0x3783 0x00
0.0 – 5.0 s
0 – 156
3.0 sec Determines how long the position hold function is allowed to
operate before the EM brake is set. This time should be set long
enough for the position hold to settle.
This parameter appears twice in the menu structure. Changing
the value of this parameter affects this (same) parameter in the
Position Hold menu
Brake Set Time
EM_Brake_Set_Time
0x3484 0x00
40 – 2000 ms
5 – 250
800 ms The estimated time for the EM brake to physically set after
releasing the holding voltage. This determines how long the
controller waits, after removing voltage from the EM Brake Driver,
before releasing the motor torque. This should be set longer than
the actual brake setting time to ensure the vehicle does not move
before the brake fully engages.
Torque Release Time
EM_Brake_Torque_Release_
Time
0x3481 0x00
40 – 2000 ms
5 – 250
200 ms Set the time (in milliseconds) to release the torque after EM Brake
has set and motor has stopped (EMBrakeEngagedAndStopped state).
Brake Release Time
EM_Brake_Release_Time
0x3483 0x00
40 – 2000 ms
5 – 250
48 ms Estimated time for the EM brake to physically release after the
pull-in voltage is applied. Use this to ensure the position hold’s
torque buildup is complete before the brake releases. When set
too low the vehicle may experience rollback on EM brake release.
Torque Preload Time
EM_Brake_Torque_Preload_
Time
0x3482 0x00
0 – 800 ms
0 – 100
200 ms The estimated worst-case time to build up the torque required to
hold the vehicle stationary on a hill prior to EM brake release.
Use this in conjunction with Release Delay to determine when
to release the brake and allow the speed request to slew away
from zero.
Torque Preload Enable
EM_Brake_Torque_Preload_
Enable
0x3478 0x00
On/Off
On/Off
On When enabled, this function eliminates rollback when the throttle
is re-engaged on a ramp by forcing the vehicle to rst enter
position-hold before setting the EM brake and then remembering
the amount of torque that was necessary to hold it on the ramp.
When the throttle is re-engaged, this value is loaded in the
motor before releasing the EM brake. The torque value is cleared
automatically when KSI power is cycled.
Off = When a valid throttle input is received, the speed controller
will start with no torque preload as soon as the Release Delay
expires. This will allow some rollback when the EM brake
releases. This rollback can be reduced by raising the Exit
Rollback Reduction parameter in the Position Hold Menu
On = When a valid throttle input is received, the speed controller
will start with a pre-set torque as measured by position-
hold when the vehicle came to a stop.
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