Curtis 1244 Manual, Rev. E
A-3
APPENDIX A: GLOSSARY
Current ratio
e 1244 controller’s current limit increases with increased throttle, according
to an algorithm developed to produce smooth starts and good overall vehicle
driving characteristics. e current ratio parameter allows the OEM to adjust
the amount of current available at low throttle requests in order to provide
quicker startups and improved ramp climbing at partial throttle if that is de-
sired for a specific application. Refer to Section 3, page 38, for the range of
programmable settings, and to Section 6 for instructions on how to use this
parameter to tune vehicle performance.
Decel rate
e deceleration rate defines the time the controller takes to reduce its PWM
output to zero when the throttle request is reduced from 100% to zero. e
decel rate is programmable from 0 to 10 seconds—see Section 3, page 26.
e decel rate parameter together with the Restraint and rottle Braking
Percent parameters allows the OEM to tune the vehicle’s performance in response
to reduced throttle, especially when traveling downhill—see Section 6, page 63.
Emergency reverse
Emergency reverse is activated when the keyswitch is On and the emergency
reverse input is pulled high, provided the controller is configured with this feature
active. Typically, 1244 controllers are used on rider vehicles. Emergency reverse
is only applicable to walkies. If you plan to install your 1244 controller on a
walkie, refer to Section 2, page 19, and to Section 3, page 48, for instructions
regarding emergency reverse.
Environmental protection
e 1244 controller is housed in a rugged ABS plastic case providing environ-
mental protection that meets the requirements of IP64/IP67. e controller
should be kept clean and dry to ensure long life. Additional protection is rec-
ommended if the controller is mounted in a location exposed to dirt or water
splash.
ET-series electronic throttles
e ET-XXX is a wigwag-style throttle control assembly. It provides a 0–5V
signal in both the forward and reverse directions. Use of this throttle control
assembly requires that the controller’s throttle input be configured for a Type2
(single-ended 0–5V) throttle.
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