Curtis PMC 1297 Manual
72
Preliminary on Verso page is set with right edge at 7 and 7/8,
and the top (as on the Recto page) at 1/4.
➂
Setting the Vehicle’s Unloaded Top Speed
The controller and vehicle should be configured as follows before starting this
procedure:
• Max Speed = 100%
• Drive Current Limit as established in procedure
➁
• Field Map = 50%
• Field Map Start = 50% of the specified drive current limit
• Field Min = motor manufacturer’s specified minimum (if available);
otherwise, 5 amps
• Load Comp = 0
• The vehicle should be unloaded
• The vehicle battery should be fully charged.
The vehicle should be driven on a flat surface in a clear area during this
procedure. Since the vehicle may initially be traveling at speeds in excess of the
final intended speed, precautions should be taken to ensure safety of test
personnel and anyone in the test area.
STEP 1. Select the programmer’s Program Menu and scroll down until the
Field Min parameter is visible in the display.
STEP 2. Power up the vehicle and apply full throttle. While driving the
vehicle with full throttle applied, adjust the Field Min parameter
to set the desired top speed. Increasing the Field Min value
decreases the vehicle’s top speed; decreasing the Field Min value
increases the vehicle’s top speed.
CAUTION:
Do not decrease the
Field Min below the motor manufacturer’s recommended mini-
mum field current value. And, as a general rule, do not increase
Field Min above the following values.
150 amp controller 8 amps
250 amp controller 10 amps
350 amp controller 15 amps
STEP 3. If the Field Min is increased to the listed value and the vehicle’s
top speed has still not been sufficiently reduced, the Max Speed
parameter should be used to bring the top speed down to the
desired level. First, decrease the Field Min value, setting it to
optimize smooth starting. Then adjust the Max Speed parameter
per Step 4 to bring the vehicle’s top speed down to the desired
level. NOTE: If the Field Min parameter is set too high, the high
initial torque created by the high field current may cause overly
abrupt starts; this is why we recommend using the Max Speed
parameter in those cases where a moderate Field Min setting does
not sufficiently reduce the vehicle’s top speed.
STEP 4. Scroll up the Program Menu until the Max Speed parameter is
visible in the display. While driving the vehicle with the Field
5 — VEHICLE PERFORMANCE ADJUSTMENT: Traction Tuning
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