Wesley BC-620-4CA - Manual (Page 50)

46 Curtis 1234/36/38 Manual,
OS
11
3 — PROGRAMMABLE PARAMETERS: EM Brake Control Parameters
EM BRAKE CONTROL MENU
ALLOWABLE
PARAMETER RANGE DESCRIPTION
Brake Type 0–2 The brake type parameter determines how the EM brake responds to the
EM_Brake_Type 0–2 interlock input, throttle, and vehicle motor speed.
0 EM brake function disabled. The EM brake driver (PWM2) is
released to general I/O use with VCL.
1 EM brake controlled by interlock. The controller will command the
EM brake to release whenever the interlock is closed (Interlock =
On). If interlock braking is enabled and the interlock opens
when the vehicle is moving at motor speed greater than
EM_Brake_Set_Speed_Threshold, the controller will brake the
vehicle to a stop (with interlock braking) and then command the EM
brake to set. If the vehicle motor speed is less than this threshold,
the EM brake will engage after the Sequencing_Delay has expired.
If interlock braking is disabled, the EM brake will engage after
the Sequencing_Delay has expired.
2 EM brake controlled by interlock and neutral. The controller will
command the EM brake to set whenever the throttle command is
zero and motor speed is less than EM_Brake_Set_Speed_Threshold.
Position Hold will be enabled automatically.
Pull In Voltage 0–100 % The EM brake pull-in voltage allows a high initial voltage when the EM
EM_Brake_Pull_In_Voltage 0–32767 brake first turns on, to ensure brake release. After 1 second, this peak
voltage drops to the EM brake holding voltage.
Note: The Battery Voltage Compensated parameter controls whether
the pull-in and holding voltages are battery voltage compensated.
Holding Voltage 0–100 % The EM brake holding voltage allows a reduced average voltage to be
EM_Brake_Holding_Voltage 0–32767 applied to the brake coil once the brake has been released. This
parameter must be set high enough to hold the brake released under all
shock and vibration conditions the vehicle will be subjected to.
Note: The Battery Voltage Compensated parameter controls whether
the pull-in and holding voltages are battery voltage compensated.
Battery Voltage Compensated On/Off This parameter determines whether the EM brake pull-in and holding
EM_Brake_Battery_Voltage_ On/Off voltages are battery voltage compensated. When set On, the pull-in and
Compensated holding voltages are compensated relative to the set Nominal Voltage (see
EM_Brake_Battery_Voltage_ Battery Menu, page 55). In other words, the output voltage is adjusted to
Compensated_Bit0 [Bit 0] compensate for swings in battery voltage, so the percentage is relative to
the set Nominal Voltage—not to the actual voltage.
For example, suppose Nominal Voltage is set to 48V and Holding
Voltage is set to 75% (36V) to the output driver. Now suppose the bus volt-
age dips to 40V. If Battery Voltage Compensated = On, the output will still
be 36V (Nominal Voltage × Holding Voltage) to the coil. If Battery Voltage
Compensated = Off, the output will be 30V (Actual Voltage × Holding Volt-
age) to the coil.
Set EM Brake On Fault On/Off When programmed On, the controller’s operating system will drop the
EM_Brake_Set_Upon_Fault On/Off electromagnetic brake when a fault occurs that has a fault action of
EM_Brake_Set_Upon_ ShutdownEMBrake. See Section 8 for a list of all the faults that have a fault
Fault_Bit0 [Bit 0] action of ShutdownEMBrake.