Description

1： Mounting dimensions, Curtis 1204M and 1205M motor controllers.

2:CURTIS 1204M series CONNECTIONS
The controller’s connectors are all conveniently located on one end:

High current connections

These controllers have four high-current busbars: B+, B-, A2, and M-.

The busbars are tin-plated solid copper.

Table 1 High Current Connections

B+ Battery+ and motor armature. (plug diode -)

B- B-.

A2 Motor armature and field (plug diode +).

M- Motor field (controller output).

Cables used for the battery and motor connections must be heavy enough to
carry the high current required. A minimum size of 25 mm2 (#4 AWG) is
recommended.

Connections to the controller busbars should be made with lugs suitable
for the cable used, fastened by M8 bolts and nuts. When tightening the bolts,
two opposing wrenches should be used. Failure to use the double-wrench
technique could cause undue strain to be placed on the internal connections,
and could also result in cracked seals around the busbars.

Low current connections
These controllers have five low-current connections: four 6.35 mm push-on
terminals (J1, J2, J3, and J5), and one 4-pin connector (J4).

Table 2 Low Current Connections

J1 Keyswitch.

J2 Wire 1 of 2-wire throttle; Pot High of 3-wire or ITS throttle.

J3 Wire 2 of 2-wire throttle; Pot Wiper of 3-wire throttle;

Pot Low of ITS thottle; or electronic throttle input.

J4 4-pin connector: see Table 3.

J5 Reverse signal output / main contactor coil driver.

CONNECTIONS

The controller’s connectors are all conveniently located on one end:
For the control wiring, 0.75 mm2 (#18 AWG) vinyl insulated stranded wire
is recommended

The mating connector for J4 is a 4-pin Molex Mini-fit Jr. or equivalent. Either
an external Status LED or a Curtis programmer can be connected to J4. The
pinout is as follows.

The mating connector for J4 is a 4-pin Molex Mini-fit Jr. or equivalent. Either
an external Status LED or a Curtis programmer can be connected to J4. The
pinout is as follows.

2 — INSTALLATION & WIRING: Connections
Table 3 J4 Connector Pinout

PIN PROGRAMMER STATUS LED

J4-1 Data input from programmer (Rx). Status LED enable.

J4-2 Ground. Ground.

J4-3 Data output to programmer (Tx). Status LED output.

J4-4 +15 V. +15 V.

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