| CONTROLLERS
|
RESISTOR
CONTROL CHOPPER CONTROL USING CURTIS |
| Stop control –Cause vehicle
to give jerks |
Smooth step less control
Infinitely at each step input variable drive and brake
control |
| High battery
power losses in terms of heat |
- Very low power loss. Controller in resistor
and motor. Hence poor efficiency approximately 95%
at full speed of the system.
|
| Reduced battery
life due to current demands in the form of surges while
selecting different steps |
Improves battery
life and performance Dramatically due to smooth and tight
control Of motor current and voltage. |
| Battery current is always
equal to the Motor current demand |
Actual current drawn from
the battery is Always less than the motor current demand
Because of the Current Multiplication feature of the controller.
|
| Jerky start of the vehicle.
|
Smooth start ensured due
to controlled and and adjustable acceleration provided
by the Controller |
| Life of the tips of contactor
is drastically Reduced due to massive arcing. |
Arc less contactor switching
ensured by the controller |
| Safety of the vehicle drives
and brake operations not possible with this kind of control
|
Built –in protections of
the controller continuously ensure drive and brake safety
and prevent accidental runway conditions. |
- One single style of vehicle operation
|
Multiple operating styles
possible on a single vehicle with programmable controllers
|
| Batteries are not protected
from over-discharge. Thus batteries are always prone to
damage due to such a condition. |
Controller protects batteries
from over discharge by effecting a shutdown as soon as
the low battery voltage is detected. |
| No fault diagnosis is there
to monitor the contactor faults like welded contacts,
open or short coil, etc. |
Almost every Curtis controller
has built-in contactor fault diagnostic capabilities to
monitor them continuously for any such fault. |
| High running costs incurred
on maintenance of battery, motor and contactor. |
Controller features and
protection result In very low maintenance costs.
|
| Driving feel of the vehicle
not very good. |
Driving feel adjustable to suit the operator’s
needs by changing the controller
|
