User Manual

Curtis 1268 Manual, Rev. D 45
step 1. Set the following parameters:
•
FLD BRAKE = On
•
FLD BRAKE MAX = FIELD MIN
• FLD BRAKE SPD = a low value (e.g., 3 mph)
•
FLD BRAKE RATE = 2.
step 2. Drive the vehicle up a grade.
step 3. Release the throttle. The vehicle will slow down and then roll
back down the hill under gravity. Depending on the setting of
the WARNING OPTION parameter, you may hear beeping.
If the vehicle is rolling too fast, increase the
FLD BRAKE MAX
setting. This will cause a higher plug braking current. It will
also increase the braking feel as the vehicle initially slows down
before changing direction.
To make the low-speed braking occur earlier, increase the
FLD BRAKE SPD.
To increase the strength of the low-speed braking as the
vehicle is brought to a stop, increase the
FLD BRAKE RATE and FLD
BRAKE MAX
.
step 4. Drive the vehicle on flat ground to confirm that the extra brak
-
ing feel provided by these adjustments is acceptable.
bm
EM Brake Operation (with optional EM brake)
During normal operation, the EM brake is applied at the expiration of the
EMB DELAY. The FLD BRAKE setting (Off or On) determines when the EMB DELAY
countdown begins.
Note: For EM brake control during fault conditions, see
EMB SPD VALUE,
page 29.
(1) FLD BRAKE = Off
Here the
EMB DELAY sets the length of time between the main contactor opening
and the EM brake being applied.
step 1. Set the following parameters:
•
FLD BRAKE = Off
•
EMB DELAY = <1.0 second
(2) FLD BRAKE = On
Here the
EMB DELAY sets the length of time the field current is held at the FLD
BRAKE MAX
before the EM brake is applied. This guarantees that the EM brake
will be applied some time after the vehicle has slowed below the
FLD BRAKE SPD
(even though the main contactor may still be closed) and is useful in prevent
-
ing the vehicle from continuing to roll forward. Additionally, if the controller
5 — TUNING GUIDE