20
Curtis 1212 Manual
3 — PROGRAMMABLE PARAMETERS: Motor Parameters
MOTOR MENU
ALLOWABLE
PARAMETER RANGE DESCRIPTION
System Resistance 0–800 mΩ Sets the system resistance (motor + brushes + wiring + connections) used
for load compensation and speed estimation. Control system performance
depends on this parameter being set correctly; it must be set to the actual
cold motor resistance.
For instructions, see initial setup procedure
4, on page 28.
Resistance Auto Comp On/Off Resistance is automatically measured under a preset low current before
the brake is released. The measured motor resistance plays an important
role in IR compensation.
The Resistance Auto Comp parameter enables/disables this
automatic function.
Auto Comp Current Limit 5–50 % Sets the current limit used for automatic resistance testing, as
a percentage of the Main Current Limit (see Current menu).
Speed Scaler 20–27 V The Speed Scaler parameter sets the maximum voltage that can be
applied to the motor. It can be used to eliminate variations in maximum
speed that would otherwise result when driving with a fully charged
battery vs. a partially discharged battery. If Speed Scaler is set to 23 volts,
for example, the maximum vehicle speed will be the same whether the
actual battery voltage is 27 volts or 23 volts or any value in between.
Current Rating 0–45 A This parameter should be set to the current rating provided by the motor
0–70 A manufacturer.
For 1212-22xx controllers, it is adjustable from 0 to 45 amperes.
For 1212-24xx controllers, it is adjustable from 0 to 70 amperes.
Max Current Time 0–120 sec Sets the maximum amount of time the motor is allowed to run at the main
current limit.
Cutback Gain 0–100 % When the motor overheats, the drive current is cut back until it reaches
the programmed Current Rating. The Cutback Gain determines how
quickly this cutback will occur, once the programmed Max Current Time
has expired.
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