Wesley BC-620-4CA - Manual (Page 51)

Curtis 1234/36/38 Manual,
OS
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2 3 J U LY 2 0 0 8 D R A F T
3 — PROGRAMMABLE PARAMETERS: EM Brake Control Parameters
EM BRAKE CONTROL MENU, cont’d
ALLOWABLE
PARAMETER RANGE DESCRIPTION
Set Speed Threshold 5–100 rpm Determines the speed below which the EM brake will be commanded
Set_Speed_Threshold 5–100 to set. Setting this speed too high may cause a jerky stop when the EM
brake sets and stops the motor.
Release Delay 40–2000 msec Estimated time for the EM brake to physically release after the pull-in
EM_Brake_Release_Delay 5–250 voltage is applied. This is used to ensure the position hold torque buildup
is complete before the brake releases. When set too low, the vehicle may
experience rollback on EM brake release.
Set Speed Settling Time 0–5000 msec Determines how long the position hold function is allowed to operate
Set_Speed_Settling_Time 0–156 before the EM brake is set. This time should be set long enough for the
position hold to settle.
Note: This parameter is applicable only when Speed Mode or Speed
Mode Express is selected and either Position Hold Enable = On or EM
Brake Type = 2.
Torque Preload Delay 0–800 msec Estimated worst-case time to build up the torque required to hold the
EM_Brake_Torque_Preload_ 0–100 vehicle stationary on a hill prior to EM brake release. This is used in
Delay conjunction with Release Delay to determine when to release the brake
and allow the speed request to slew away from zero.
Note: This parameter is applicable only when Speed Mode or Speed
Mode Express is selected and either Position Hold Enable = On or EM
Brake Type = 2.
Torque Preload Enable On/Off When enabled, this function eliminates rollback when the throttle is
EM_Brake_Torque_Preload_Enable On/Off re-engaged on a ramp by forcing the vehicle to first enter position-hold
EM_Brake_Torque_Preload_ before setting the EM brake, and then “remembering” the amount of torque
Enable_Bit0 [Bit 0] that was necessary to hold it on the ramp. When throttle is re-engaged,
this value is loaded in the motor before the EM brake is released. 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.
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.
Note: This parameter is applicable only when Speed Mode or Speed
Mode Express is selected and either Position Hold Enable = On or EM
Brake Type = 2.
Torque Preload Cancel Delay 0–120 sec The timer starts after the EM brake is set. If the timer expires before the
EM_Brake_Torque_Preload_ 0–15000 throttle is re-engaged, the torque preload memory will be cleared. Setting
Cancel_Delay this parameter to zero disables the timer, i.e., the preload is never can-
celled. The purpose of this delay is to prevent the vehicle from lunging
forward if it is unloaded on a hill such that the torque measured by
position-hold is no longer valid.
Note: This parameter is applicable only when Torque Preload Enable =
On (see conditions above).