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

3 — PROGRAMMABLE PARAMETERS

a speed limit pot is not used, the minimum speed parameter deﬁnes the maximum

controller output at full throttle unless Pin 4 is jumpered to Pin 1 (see page 22).

If the Pin 4–1 jumper is used, the maximum speed parameter deﬁnes the

maximum controller output at full throttle and the minimum speed parameter is

not applicable.

In the examples shown in Figure 18, the minimum speed parameter is set at

50% in Mode 2 and at 20% in Mode 1. The speed curves are straight lines in

these examples because we are assuming a 50% ramp shape setting. The throttle

response is not necessarily linear; see ramp shape parameter (page 38).

The speed interlocks (see Section 4) ensure that the minimum speed is set

lower than the maximum speed in each mode (M1 Min Speed < M1 Max Speed,

and M2 Min Speed < M2 Max Speed).

REVERSE SPEED [default access: User]

The reverse speed parameter deﬁnes the maximum controller output in reverse

at full throttle with the speed limit pot in its maximum speed position. Reverse

speed is not affected by which mode (Mode 1, Mode 2) is selected. In the example

shown in Figure 19, the reverse speed parameter is set at 40%.

The “minimum” speed in reverse (the speed at full throttle with the speed

limit pot in its minimum speed position) is by deﬁnition equal to the M1

Minimum Speed.

The speed interlocks (see Section 4) ensure that the reverse speed parameter

cannot be adjusted below the M1 Minimum Speed or 25% (whichever is higher)

nor above the M1 Maximum Speed.

Fig. 18 Examples of

speed curves with the

speed limit pot in its

minimum speed position.

THROTTLE (percent)

PWM OUTPUT (percent)

100

100908070605040302010 0

MINIMUM SPEED

(set at 50%)

MINIMUM SPEED

(set at 20%)

1 2 ... 33 34 35 36 37 38 39 40 41 42 43 ... 92 93

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Curtis 2000 Spécifications Page 38