Curtis 1238SE - Figure 8: Braking Response Rate Diagram

4 — PROGRAMMABLE PARAMETERS
Curtis 1232E/34E/36E/38E & 1232SE/34SE/36SE/38SE Manual, os 31 – May 2017 Return to TOC
pg. 36
1- SPEED MODE — FINE TUNING MENU
PARAMETER ALLOWABLE RANGE DESCRIPTION
Partial Decel Rate
Partial_Decel_Rate_SpdM
0x3082 0x00
0.1 – 30.0 s
100 – 30000
Sets the rate (in seconds) that is used to slow down the vehicle when the
throttle is reduced without being released to neutral. Larger values represent
slower response.
HS (High Speed)
HS
0x3076 0x00
0 – 100%
0 – 32767
Sets the percentage of the Typical Max Speed above which the “HS”
parameters will be used.
LS (Low Speed)
LS
0x3075 0x00
0 – 100%
0 – 32767
Sets the percentage of the Typical Max Speed below which the “LS”
parameters will be used.
Reversal Soften
Reversal_Soften
0x3074 0x00
0 – 100%
0 – 30000
Larger values create a softer reversal from regen braking to drive when near
zero speed. This helps soften the transition when the regen and drive current
limits are set to different values.
Note: This parameter is not mode-specic and appears in two places.
Changing the value of this speed-mode parameter affects the parameter listed
in: Program » Torque Mode » Response » Fine Tuning » Reversal Soften.
Max Speed Accel
Max_Speed_Accel_SpdM
0x384A 0x00
0.1 – 30.0 s
100 – 30000
In some applications, the Max Speed value is changed frequently, through
VCL or over the CANbus. The Max Speed Accel parameter controls the rate at
which the maximum speed setpoint is allowed to change when the value of
Max Speed is raised. The rate set by this parameter is the time to ramp from 0
rpm to Typical Max Speed rpm.
For example, suppose Max Speed is raised from 1000 rpm to 4000 rpm. If Typical
Max Speed is 5000 rpm and the rate is 10.0 seconds, it will take
10.0 X (4000–1000) ÷ 5000 = 6.0 seconds to ramp from 1000 rpm to 4000 rpm.
Max Speed Decel
Max_Speed_Decel_SpdM
0x3846 0x00
0.1 – 30.0 s
100 – 30000
This parameter works like the Max Speed Accel parameter, except that it
controls the rate at which the maximum speed setpoint is allowed to change
when the value of Max Speed is lowered.
For example, suppose you change Max Speed from 4500 rpm to 2500 rpm. If
Typical Max Speed is 5000 rpm, and the rate is 5.0 seconds, it will take
5.0 X (4500–2500) ÷ 5000 = 2.0 seconds to ramp from 4500 rpm to 2500 rpm.
BRAKE RATE
(seconds)
MOTOR SPEED
LOW SPEED
(LS
x
Typical_Max_Speed)
= 30%
x
5000 rpm = 1500
FASTER
Full Brake Rate HS = 1.5
Full Brake Rate LS = 3.0
Low Brake Rate = 20.0
HIGH SPEED
(HS
x
Typical_Max_Speed)
= 70%
x
5000 rpm = 3500
TYPICAL
MAX
SPEED
FASTER
100% Brake
1% Brake
INCREASING BRAKE
Figure 8
Braking response rate
diagram. In this example,
HS = 70%,
LS = 30%,
Typ Max Spd = 5000 rpm.
Quick Links:
Typical Max Speed p.54