24
Curtis 1228 Manual, Rev. F
3 — PROGRAMMABLE PARAMETERS: Throttle Parameters
Fig. 9 Effect of adjusting the throttle deadband parameter.
Single-Ended Throttle
Wigwag
Throttle
0 5V
0.8V
Deadband = 25%
1.5V
0 5V
2.3V 2.7V
2.0V 3.0V
2.5V
KEY:
Neutral 0
% 100%
Deadband output output
Notes: Voltages shown are at the pot wiper relative to B-.
Voltages are relative to a 5kΩ pot.
Throttle gain = 1.
0.4V
0.4V 4.6V
4.6V
4.6V
4.6V
V
DB
= Pot Low + (DB%) (active pot range) V
DB
= 2.5V ± (0.5) (DB%) (active pot range)
0.4V
25%
100%
10%
100%
Deadband = 10%
25%
10%
Examples of two deadband settings (25%, 10%) are shown in Figure
9, along with the equations used to determine the wiper voltage range (with
respect to B-) that the controller will interpret as neutral.
The programmer displays the throttle deadband parameter as a percentage
of the wiper voltage range and is adjustable from 6.0% to 25.0%. The default
deadband setting is 10.0%.
The throttle wiper voltage range is approximately 4 volts, measured rela-
tive to B-. This is true regardless of whether a single-ended or wigwag throttle
is used. When a single-ended throttle is used, the deadband parameter sets a
single threshold wiper voltage—that is, a wiper voltage (relative to B-) at which
the controller will begin to modulate. When a wigwag throttle is used, the
deadband parameter sets two threshold wiper voltages, one on either side of
the 2.5 V centerpoint, for forward and reverse.
Depending on the individual pot, the values for Pot Low and Pot High
(and hence for the deadband, which is a percentage of the range defined by
Pot Low and Pot High) vary. The values listed below can be used with the
equations provided in Figure 9 to calculate the actual deadband threshold(s)
for any given deadband setting:
POT POT LOW POT HIGH POT RANGE
4 kΩ 0.5 V 4.5 V 4.0 V
5 kΩ 0.4 V 4.6 V 4.2 V
7 kΩ 0.3 V 4.7 V 4.4 V
Detailed guidelines for adjusting the throttle deadband parameter are
presented in Section 4.
To Next Page
Loading...
