Curtis 1205 Guide de dépannage télécharger pdf (Page 25)

Curtis 1204/1205 Manual, Rev. C

If you prefer dynamic braking to freewheeling, you can install a

dynamic braking resistor. The motor generates power in slowing down

the vehicle; the dynamic braking resistor dissipates this power as heat.

The amount of braking torque is determined by the resistance, and is

proportional to the vehicle’s speed. The resistor gets hot and must be

sized and mounted accordingly. (NOTE: The size of the motor and the

amount of braking desired are factors in determining the appropriate

dynamic braking resistor; contact Curtis for guidelines.) The N.O. and

N.C. contacts of the forward/reverse contactors must be wired as shown

in Figure 17 or this scheme will not work.

Note that in all the PM motor wiring schemes shown (i.e., Figures

15–17), the forward/reverse switch is double-pole, double-throw (DPDT)

center-off. In addition to operating the forward/reverse contactors, the

switch turns on the controller’s KSI and main contactor when forward

or reverse is selected. By turning off the KSI in the neutral position,

the controller’s HPD feature will inhibit the controller output if the

forward/reverse switch is changed with the pedal depressed. While this

will not prevent the braking effect of reversing direction with the vehicle

moving, it will at least keep the motor from being driven in the opposite

direction.

A forward/reverse interlock module (Curtis p/n 1301) is available

for 24–36V models to prevent reversing direction while the vehicle is in

motion. This module allows the contactors to be reversed only when the

motor’s back EMF has come down to a preset level. Contact Curtis for

Application Notes providing further information.

3 — WIRING

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Curtis 1205 Guide de dépannage Page 25