PERMANENT MAGNET 

MOTOR SPEED CONTROLLER enAhic® D 

Mobility System CURTIS 

DESCRIPTION 

The Curtis Model 1211 is a microprocessor based, 

full-bridge Permanent Magnet Motor Speed Controller. 

APPLICATION 

Intended for small mobility aid scooters, the microprocessor based design of the Model 1211 offers 

enhanced performance, size, safety and cost over 

traditional analog products. 

RATINGS 

Battery Voltage: 24 VDC 

Under Voltage Cutback: 16 VDC 

Over Voltage Cutback: 32 VDC 

Max. current: 30 and 45 Amps 

Ambient Operating Temperature: -25°C to 60°C 

Ambient Storage Temperature: -40°C to 75°C 

FEATURES 

• The Model 1211 can be ordered pre-programmed or 

ordered with an optional programming port for use with the 

1311 and 1314 programmers. 

• The package design provides sealing against the elements 

in a compact size. IP rated at IP65. 

• Rugged, full metal enclosure. 

* Connecting harnesses are built into the controller to 

eliminate wiring at the base of the scooter and excess 

connectors. 

* Microprocessor control provides enhanced safety functions 

and allows more flexibility in custom tuning of the 

application "ride and feel". 

• Advanced closed-loop speed regulation helps maintain 

speed over varied terrain, obstacles, curbs, and ramps. 

• Linear undervoltage cutback of current ensures smooth 

control, even with low batteries, with no abrupt loss of 

power. 

• Optional speed limit potentiometer input provides direct 

and linear control over the maximum vehicle speed. 

• Inhibit line prevents driving while charging. 

• Key-Off deceleration function ensures a smooth "brake to 

stop" when the key is turned off. 

• Anti roll-back/roll-forward function improves vehicle control 

on hills and ramps. 

• Internal main contactor provides secure power-off. 

• Fault detection and internal fault recording option (requires 

programmer). 

• Optional Push-Switch input releases the brake and allows 

the motor to free-wheel. 

• Push-Too-Fast software restricts vehicle top speed, even with 

the key off. 

• Power Saver function deactivates the main contactor after a 

period of non-use to reduce battery drain. 

CURTIS INSTRUMENTS, INC. 

200 KISCO AVENUE 

MT. KISCO, NY 10549 

USA 

TEL (914) 666-2971 

FAX (914) 666-2188 

235 EAST AIRWAY BLVD. 

LIVERMORE, CA 94551 

USA 

TEL (925) 961-1088 

FAX (925) 961-1099 

www.curtisinstruments.com 
99mm 

39mm 

1.00oo 

,00(x), 

J1 +15 

GROUND 

Tx DATA 

R x DATA 

J2-5 POT HI 

POT WIPER 

POT LOW 

INH 

J2-1 

•

KS 

J2-2 

BATTERY 

CHARGER 

INHIBIT 

DIMENSIONS MM 

J2-6 

EM BRAKE J3-4 

MOTOR 

J2 

LOGIC CONNECTOR 

FRONT VIEW 

J1 

J1 

0.=.0 

J1 

J2-4 

J2-3 

1211 

CONTROLLER 

FUSE 

4.1 (0.16) dia., 2 plcs 

73mm 

60mm 

5K 

THROTTLE 

POT 

100K SPEED 

KSI 

BRAKE + 

BRAKE 

M1 

M2 

B+ 

Bi 

J3 

BRAKE CONNECTOR 

FRONT VIEW 

ijjfl 

MODEL CHART 

Model No. Voltage Rating Drive Current 

1211-22XX 24 V 30 A 

1211-24XX 24 V 45 A 

TYPICAL WIRING DIAGRAM 

PROGRAMMER 

(OPTIONAL) 

WARRANTY Two year limited warranty from time of delivery. 

ICo 4, a trademark of Curtis Instruments, Inc. 

CURTIS 

Specifications subject 10 change without notice ©2007 Curtis Instruments, Inc. 50131 REV E 4/07