Curtis 2000 Dokumentacja Pobierz pdf (Strona 84)

Curtis PMC 1223/33, 1225/35, 1227/37 Manual

A-10

APPENDIX A: GLOSSARY

netic brake mechanically released. The controller, even if it is powered off and

there are no batteries in the system, will detect the motor voltage created by the

moving vehicle. When this voltage becomes high enough, indicating that signiﬁ-

cant vehicle speed has been reached, the controller logic will power up and turn

on the MOSFET power sections to short the motor and limit the speed of the

vehicle.

PWM

Pulse width modulation (PWM), also called “chopping,” is a technique that

switches battery voltage to the motor on and off very quickly, thereby controlling

the speed of the motor. Curtis PMC 1200 series controllers use high frequency

PWM—15 kHz—which permits silent, efﬁcient operation.

Ramp shape (static throttle map)

The ramp shape parameter determines the controller’s static throttle map.

Adjusting the throttle characteristics to suit your speciﬁc application can enhance

your vehicle’s performance. The ramp shape parameter is programmable—see

Section 3, page 38.

Regenerative braking

The 1223/33, 1225/35, 1227/37 controllers use regenerative braking to slow the

vehicle to a stop and to reduce speed when traveling downhill. Regenerative

braking means that the energy used to slow the vehicle is channeled back into the

batteries, resulting in longer vehicle range between charges.

Regen current boost

By allowing the regenerative braking current to be set up to 25% higher than the

main drive current limit, this feature can provide the higher braking torque

necessary to stop very heavy vehicles on steep inclines. The regen current boost

parameter (“Calibration 5” in the Program Menu) is programmable—see Section

3, page 40.

Reverse polarity protection

If the B+ and B- connections are reversed to an otherwise properly wired

controller, it will not allow the main contactor to be engaged. This protects the

power MOSFET output section from being damaged by the reverse polarity.

1 2 ... 79 80 81 82 83 84 85 86 87 88 89 ... 92 93

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