Curtis Series Electronic Motor Speed Controller 1204x 1205x

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D E S C R I P T I O N

Curtis PMC Models 1204X/1205X are power MOSFET
electronic motor speed controllers designed to provide smooth,
silent, efficient and cost effective speed, torque and braking
control.

A P P L I C A T I O N

Curtis PMC MOSFET motor speed controllers are ideal for
a variety of electric vehicle applications, including industrial
trucks, personnel carriers, material handling vehicles, tow
tractors, walkie and small forklift applications, scrubbers,
sweepers, scissors-lift and boom trucks, etc.

F E A T u R E S

High frequency switching and ultra low voltage drops provide

very high efficiency and silent operation. Costs, heatsinking

requirements and motor and battery losses are reduced. Low

end torque, range and battery life are increased.

Environmental protection provided by a rugged, sealed

(factory serviceable) anodized aluminum extrusion housing.

Simple mounting and wiring with push-on type connectors for

control signals. Plated solid copper busses used for all power

connections.

Thermal protection and compensation circuit provides under-

temperature cutback, constant current limit over operating

range, and linear rollback in over-temperature. No sudden loss

of power under any thermal conditions.

High pedal disable option prevents controller operation if the

key switch is turned on while throttle is applied.

Static return to off option prevents controller operation if the

keyswitch is turned on while a forward or reverse direction is

selected.

Adjustable acceleration rate, current limit (protected against

exceeding controller rating) and plugging current limit.

Adjustments are accessed through sealed screws in side of

housing (optional). No adjustments are required.

Variable plugging current feature provides throttle position

control over braking to improve driveability.

Full fault detect circuitry monitors power supply, throttle

connections, output transistors, bypass contactor, etc., to prevent

runaway.

Delayed bypass (1A) output drives optional bypass contactor

(normally not required) after throttle reaches 90% and bypass

delay times out (available on 12 and 24-36 volt models only).

Arcless contactor switching for F/R contacts and bypass contacts

(if opened below controller current limit).

Short circuit protected F/R and bypass contactor drivers to

prevent failure of sealed unit in the event of an accidental

short in contactor coil circuit.

S P E C I F I C A T I O N S

Frequency of Operation: 15 kHz

Standby Current: less than 20 mA

Standard Throttle Input: 0-5k ohms ±10%

(others available)

Weight: 1204: 1.8 kg (4 lbs);

1205: 2.7 kg (6 lbs)

Full Power Operating Temperature Range:

-25°C to 75°C (controller temperature)

M O S F E T E L E C T R O N I C

M O T O R S P E E D C O N T R O L L E R S

M O D E L 1 2 0 4 X / 1 2 0 5 X

www.curtisinstruments.com

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Optional

Precharge Resistor

Control

Wiring

Fuse

M-

A2

B+

B-

Power

Wiring

Fuse

A

133.3

(5.25")

B

71

(2.80")

3.3

(0.13")

8.4 Dia

(0.33")

4 plcs

22 (0.85") x 19 (0.75")

x 3.2 (0.125") Thk

4 plcs

113

(4.45")

16

(0.65")

146

(5.75")

130.3

(5.13")

7.1 Dia

(0.281")

4 plcs

DIM

A

B

1204X

174 (6.85")

19 (0.75")

1205X

225 (8.85")

44 (1.75")

Throttle

Pot

S1

S2

Motor

Field

A2

A1

+

Main

Motor

Armature

Key

Switch

Throttle

Switch

Polarity

Protection

Diode

Main

F

R

F

R

Forward

Reverse

F

R

*

30 second rating

1204X -12xx

-14xx

-42xx

-44xx

1205X -44xx

-53xx

12

12

24-36

24-36

24-36

36-48

275

400

*

275

400

*

400

350

.35V

.25V

.35V

.25V

.25V

.35V

9

9

16

16

16

21

200

210

200

210

275

250

125

135

125

135

175

150

275

300

275

300

400

350

CURTIS PMC

MODELS

VOLTAGE

INPUT

(volts)

CURRENT

LIMIT

(amps)

2 MIN

RATING

(amps)

5 MIN

RATING

(amps)

VOLTAGE

DROP

@ 100A

1 HOUR

RATING

(amps)

UNDERVOLT

CUTBACK

(volts)

M O D E L 1 2 0 4 X / 1 2 0 5 X

M O D E L C H A R T

T Y P I C A L W I R I N G D I A G R A M

D I M E N S I O N S

W A R R A N T Y

Two year limited warranty from time of delivery.

Specifications subject to change without notice

50048 REV B 10/08

©2006 Curtis Instruments, Inc.

is a trademark of Curtis Instruments, Inc.

A2

M-

B-

B+

+

FOR

W

ARD

REVERSE

MAIN

F

R

S2

A2

S1

A1

F

R

F

R

POTBOX

MAIN

KEYSWITCH

INTERLOCKS

PEDAL

MICROSWITCH

CONTROL WIRING

FUSE

POLARITY

PROTECTION

DIODE

PRECHARGE RESISTOR

(250 W, 5 W)

POWER WIRING

FUSE

1A

BYP

ASS

1A BYPASS

*

(* not used with SRO controllers)

Bypass cont. output

REV input

Emergency reverse **

FWD input

F/R cont. output

KSI


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