Wesley BC-620-4CA - Manual (Page 43)

Curtis 1234/36/38 Manual,
OS
11 39
2 3 J U LY 2 0 0 8 D R A F T
3 — PROGRAMMABLE PARAMETERS: Current Limit Parameters
* The full rated current depends on the controller model; see
specifications in Table D-1 for the rated current of your model.
POSITION HOLD MENU, cont’d
ALLOWABLE
PARAMETER RANGE DESCRIPTION
Entry Rate 5–100 % When the vehicle transitions from forward speed to reverse speed
Entry_Rate_Position_Hold 50–1000 or from reverse speed to forward speed (for example, when coming to
a stop going up a steep ramp), Position Hold is automatically entered
immediately at zero speed—regardless of this parameter.
This parameter applies when the vehicle needs to be brought to
a stop without the assistance of gravity (for example, when moving
forward down a ramp). This rate determines how quickly zero speed
is attained after the ramped speed request reaches zero. Setting this
parameter too high will make the stop seem very abrupt, and may even
cause the vehicle to roll back slightly. When the parameter is set lower,
the vehicle take longer to come to a stop and enter Position Hold mode.
Exit Rollback Reduction 0–100 % This function is applicable only when the Torque Preload function has
Exit_Rollback_Reduction 0–2048 been disabled (see EM Brake menu), or its timer has expired. It intro-
duces a proportional feedforward term into the speed controller based
on the position signal. For example, suppose the vehicle is on a ramp
and a forward throttle request is given such that the vehicle rolls back
slightly before climbing the ramp (again, assuming the torque preload
function is inactive). As the vehicle rolls back a feedforward torque term
proportional to the rollback position will be added to the torque request
until forward speed is sensed.
CURRENT LIMITS MENU
ALLOWABLE
PARAMETER RANGE DESCRIPTION
Drive Current Limit 5–100 % Sets the maximum RMS current the controller will supply to the motor
Drive_Current_Limit 1638–32767 during drive operation, as a percentage of the controller’s full rated
current.
* Reducing this value will reduce the maximum drive torque.
Regen Current Limit 5–100 % Sets the maximum RMS regen current, as a percentage of the controller’s
Regen_Current_Limit 1638–32767 full rated current. * The regen current limit applies during neutral braking,
direction reversal braking, and speed limiting when traveling downhill.
Brake Current Limit 5–100 % Sets the maximum RMS regen current during braking when a brake
Brake_Current_Limit 1638–32767 command is given, as a percentage of the controller’s full rated current. *
Typically the brake current limit is set equal to the regen current limit.
The brake current limit overrides the regen current limit when the brake
input is active.
EMR Current Limit 5–100 % Sets the maximum RMS current allowed for braking and drive when in
EMR_Current_Limit 1638–32767 emergency reverse. The emergency reverse current limit is a percentage
of the controller’s full rated current.
*
Interlock Brake Current Limit 5–100 % Sets the maximum RMS regen current during interlock braking, as a
Interlock_Brake_Current_Limit 1638–32767 percentage of the controller’s full rated current. *