Curtis MultiMode 1214-8 Manual page 33

Curtis 1214-/15-/19-8 Manual
MOSFET
A MOSFET (metal oxide semiconductor field effect transistor) is a type of
transistor characterized by its fast switching speeds and very low losses.
MultiMode™
The MultiMode™ feature of these controllers allows the vehicle to be operated
with two distinct sets of characteristics. The two modes can be programmed to be
suitable for operation under different conditions, such as slow precise maneuver-
ing in Mode 2 and faster, long distance travel in Mode 1. The following
parameters can be set independently in the two modes:
— main current limit
— plug current limit
— ramp start current limit
— acceleration rate
— maximum speed
The operating mode is selected by means of the mode selection switch. As a
factory standard, Mode 1 is selected when the mode selection switch (Pin 3) is
pulled high. Otherwise, the controller operates by default in Mode 2. When the
controller transitions between modes, it automatically changes the main current
limit, the plug current limit, the ramp start current limit, the acceleration rate,
and the maximum speed to their individual mode-specific settings.
If the anti-tiedown feature is active, Mode 1 must be re-selected each time
the brake is released.
Neutral brake
The optional neutral brake feature provides automatic plug braking in neutral. If
this option is not selected, the vehicle is free to coast in neutral. The neutral brake
plug current limit is programmable.
Overtemperature
At overtemperature (from 85°C to 95°C), the drive current limit is linearly
decreased from full set current down to zero. (Plug current, however, is not
reduced—in order to provide full vehicle braking under all thermal conditions.)
The operating PWM frequency is shifted to 1.5 kHz when the controller is
operating in the overtemperature range.
APPENDIX A: FEATURES & FUNCTIONS
A-6