Curtis 1244 User manual

Manual
Model 1244
MultiMode™ Electronic Motor Controller
Read Instructions Carefully!
Specications are subject to change without notice.
© 2013 Curtis Instruments, Inc. ® Curtis is a registered trademark of Curtis Instruments, Inc.
© The design and appearance of the products depicted herein are the copyright of Curtis Instruments, Inc. 16958 Rev E 10/2013
Curtis Instruments, Inc.
200 Kisco Avenue
Mt. Kisco, NY 10549
www.curtisinstruments.com

iii
Curtis 1244 Manual, Rev. E
CONTENTS
1. OVERVIEW ...........................................................................................1
2. INSTALLATION AND WIRING.........................................................4
Mounting the Controller ..................................................................4
Connections: Low Current ..............................................................6
Connections: High Current .............................................................7
Wiring: Controller...........................................................................8
Wiring: rottle.............................................................................10
5kΩ–0, 2-wire resistive throttle (“Type 1”) ..............................11
0–5V, current source, 3-wire pot, and electronic
single-ended throttles (“Type 2”) .....................................12
0–5kΩ, 2-wire resistive throttle (“Type 3”) ..............................15
0–5V and 3-wire pot wigwag-style throttles (“Type 4”)............15
CAN-Nodes throttle (“Type 5”) ..............................................16
Wiring: Fault Outputs ...................................................................16
Wiring: Contactor Drivers.............................................................16
Wiring: Pedal Switch .....................................................................19
Wiring: Hour Meter ......................................................................19
Wiring: CAN Bus Interface ...........................................................19
Wiring: Emergency Reverse ...........................................................19
Contactor, Switches, and Other Hardware......................................21
3. PROGRAMMABLE PARAMETERS ..................................................23
Acceleration Parameters ..................................................................26
Acceleration Rate, M1–M4......................................................26
Braking Rate, M1–M4 ............................................................26
Deceleration Rate ....................................................................26
Quick Start..............................................................................26
Taper Rate ...............................................................................27
Speed Parameters ............................................................................27
Maximum Speed, M1–M4 ......................................................27
Creep Speed, M1–M4 .............................................................27
Regen Speed ............................................................................27
rottle Parameters.........................................................................28
Control Mode..........................................................................28
rottle Type ...........................................................................29
rottle Deadband ..................................................................30
rottle Max ...........................................................................32
rottle Map, M1–M4............................................................34
rottle Braking Percent, M1–M4........................................... 36
Current Limit Parameters ...............................................................36
Drive Current Limit, M1–M4................................................. 36
Braking Current Limit, M1–M4..............................................36
Minimum Field Current Limit ................................................36
Maximum Field Current Limit ................................................37
Restraint..................................................................................37
Emergency Reverse Current Limit ...........................................38
Current Ratio ..........................................................................38
CONTENTS

iv
Curtis 1244 Manual, Rev. E
CONTENTS
Field Control Parameters ................................................................38
Field Map Start........................................................................38
Field Map ................................................................................39
Fault Parameters..............................................................................41
High Pedal Disable (HPD) ......................................................41
HPD reshold.......................................................................42
Static Return to O (SRO)......................................................42
Fault Code...............................................................................42
Output Driver Parameters...............................................................43
Main Contactor Driver Interlock.............................................43
Main Contactor Dropout Delay ..............................................43
Main Coil Open Check...........................................................44
Main Contactor Weld Check...................................................44
Auxiliary Driver Dropout Delay ..............................................44
Auxiliary Coil Open Check .....................................................44
Reverse Signal Open Check .....................................................45
Electromagnetic Brake Delay ...................................................45
Electromagnetic Brake Open Check ........................................45
Contactor Holding Voltage......................................................46
Contactor Pull-in Voltage ........................................................46
Other Parameters ............................................................................46
Battery Voltage ........................................................................46
Anti-Tiedown ..........................................................................47
Sequencing Delay ....................................................................47
Pedal Interlock.........................................................................47
Emergency Reverse Enable.......................................................48
Emergency Reverse Check .......................................................48
Node Address ..........................................................................48
Precharge ................................................................................49
Load Compensation ................................................................49
4. OEMSPECIFIED, FACTORYSET PARAMETERS.........................50
MultiMode™ Enable ......................................................................50
Accessory Driver Enable..................................................................50
CAN Bus Enable ............................................................................51
5. INSTALLATION CHECKOUT .........................................................52
6. VEHICLE PERFORMANCE ADJUSTMENT ..................................54
Major Tuning..................................................................................54
Tuning the active throttle range ..............................................54
Tuning the controller to the motor .........................................57
Setting the unloaded vehicle top speed ....................................59
Equalizing loaded and unloaded vehicle speed ........................60
Fine Tuning ....................................................................................62
Response to increased throttle..................................................62
Response to reduced throttle....................................................63
Smoothness of direction transitions .........................................63
Ramp climbing .......................................................................65
Ramp restraint ........................................................................66

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Curtis 1244 Manual, Rev. E
7. PROGRAMMER MENUS .................................................................67
Paraneters Menu .............................................................................67
Monitor Menu................................................................................70
Diagnostics Menu...........................................................................71
Other Menus ..................................................................................71
8. DIAGNOSTICS AND TROUBLESHOOTING................................72
Programmer Diagnostics................................................................. 72
LED Diagnostics ............................................................................74
Fault Output Drivers ......................................................................75
9. MAINTENANCE ................................................................................76
Cleaning ........................................................................................76
Diagnostic History .........................................................................76
appendix aGlossary of Features and Functions
appendix bProgramming Devices
appendix cSpecifications, 1244 Controller
CONTENTS

vi
Curtis 1244 Manual, Rev. E
FIGURES
. 1: Curtis 1244 electronic motor controller...................................1
. 2: Mounting dimensions, Curtis 1244 controller ........................4
. 3: Standard wiring configuration..................................................8
. 4: Wiring for 5kΩ–0 throttle (“Type 1”)....................................11
. 5: Wiring for wigwag throttle,
using the 5kΩ–0 throttle input (“Type 1”).............................11
. 6: Wiring for 0–5V throttle (“Type 2”) ......................................12
. 7: Wiring for 3-wire potentiometer throttle (“Type 2”) ..............13
. 8: Wiring for current source throttle (“Type 2”).........................13
. 9: Wiring for Curtis ET-XXX electronic throttle (“Type 2”) ......14
. 10: Wiring for 0–5kΩthrottle (“Type 3”)....................................15
. 11: Wiring for fault outputs.........................................................16
. 12: Wiring for main and auxiliary contactor coils when using
the interlock and dropout delay features.................................18
. 13: Wiring for emergency reverse
(applicable to walkie vehicles only).........................................20
. 14: Eect of adjusting the neutral deadband parameter .........30, 31
. 15: Eect of adjusting the throttle max parameter .................32, 33
. 16: rottle maps for controller with maximum speed set
at 100% and creep speed set at 0 ...........................................34
. 17: rottle maps for controller with maximum speed set
at 80% and creep speed set at 10% .......................................35
. 18: Inuence of various parameters on controller output
response to throttle demand ..................................................35
. 19: Field current relative to armature current,
with field map parameter set at 50% and 20% ......................40
TABLES
 1: Voltages at throttle wiper input ............................................ 10
 2: Mode selection ..................................................................... 22
 3: Programmable throttle types................................................. 29
 4: Fault categories .................................................................... 43
 5: Troubleshooting chart .......................................................... 73
 6: Status LED fault codes ........................................................ 74
 7: Fault category codes ............................................................ 75
 C-1: Specifications, 1244 controller ....................................... C-1
FIGURES / TABLES

Curtis 1244 Manual, Rev. E 1
1 — OVERVIEW
OVERVIEW
Curtis 1244 MultiMode™ controllers are separately excited motor speed con-
trollers designed for use in a variety of material handling vehicles. ese pro-
grammable controllers are simple to install, efficient, and cost eective. Typical
applications include low lifts, stackers, fork lifts, reach trucks, personnel carriers,
counterbalance trucks, order pickers, boom trucks, and other industrial vehicles.
1
Fig. 1 Curtis 1244
MultiMode™ electronic
motor controller.
e 1244 MultiMode™ controller oers smooth, silent, cost eective
control of motor speed and torque. A four quadrant, full-bridge field winding
control stage is combined with a two quadrant, half-bridge armature power stage
to provide solid state motor reversing and regenerative braking power without
additional relays or contactors. e 1244 controller can also be specified to be
compatible with CAN Bus communication systems.
ese controllers are fully programmable by means of the optional hand-
held programmer or PC programming station. Use of the programmer provides
diagnostic and test capability as well as configuration exibility.

2 Curtis 1244 Manual, Rev. E
1 — OVERVIEW
Like all Curtis motor controllers, the 1244 oers superior operator control of
the vehicle’s motor drive speed. Features include:
✓Full-bridge field and half-bridge armature power MOSFET design,
providing
  •infinitelyvariableforward,reverse,drive,andbrakecontrol
 •silenthighfrequencyoperation
 •highefficiency
✓Regenerative braking, providing longer operation on a single battery charge
and reducing motor brush wear and motor heating
✓Programmability through the 1313 handheld programmer and 1314 PC
Programming Station
✓Complete diagnostics through the programmer and the internal Status LED
✓Two fault outputs provide diagnostics to remotely mounted displays
✓Continuous armature current control, reducing arcing and brush wear
✓Automatic braking when throttle is reduced from either direction; this
provides a compression braking feel and enhances safety by automatically
initiating braking in an operator hands o condition
✓Deceleration Rate, Load Compensation, and Restraint features prevent
downhill runaway conditions; speed is controlled to within approximately
20% of level surface value
✓MultiMode™ allows four user-selectable vehicle operating personalities
✓Programmable to match individual separately excited motor characteristics
✓Meets or exceeds EEC fault detect requirements
✓Vehicle top speed is controlled and limited in each mode
✓Linear temperature and undervoltage cutback on motor currents; no sudden
loss of power under any thermal conditions
✓High pedal disable (HPD) and static return to o (SRO) interlocks prevent
vehicle runaway at startup
✓Creep speed adjustable from 0% to 25% in each mode
✓Continuous diagnostics during operation, with microprocessor power-on
self-test
✓Internal and external watchdog circuits ensure proper software operation
✓Programmable coil drivers provide adjustable contactor pull-in and holding
voltages
✓Hour-meter enable output is active whenever the controller is providing
motor current
✓Optional Electromagnetic Brake Driver provides automatic control of an
electromagnetic brake or other similar function
✓Optional Reverse Signal Driver provides a low signal any time the vehicle
is driving or braking in reverse

Curtis 1244 Manual, Rev. E 3
✓Optional Auxiliary Driver provides a low signal to power an auxiliary
contactor or other similar function
✓Driver outputs are short circuit protected and provide built-in coil spike
protection
✓Controller is programmable to provide throttle control of motor speed,
applied motor voltage, or motor torque
✓Can be configured for CAN Bus compatibility.
Familiarity with your Curtis controller will help you install and operate it
properly. We encourage you to read this manual carefully. If you have questions,
please contact the Curtis office nearest you.
1 — OVERVIEW

4 Curtis 1244 Manual, Rev. E
INSTALLATION AND WIRING
MOUNTING THE CONTROLLER
e outline and mounting hole dimensions for the 1244 controller are shown
in Figure 2.
e controller can be oriented in any position, and meets the IP64/IP67
ratings for environmental protection against dust and water. However, the lo-
cation should be carefully chosen to keep the controller as clean and dry
as possible.When selecting the mounting position, be sure to also take into
consideration (1) that access is needed at the top of the controller to plug the
2
2 — INSTALLATION & WIRING: Controller
Fig. 2 Mounting
dimensions, Curtis
1244 controller.
Dimensions in millimeters (and inches)
9.5
(0.375)
12.7
(0.50)
STATUS
LED
M8 thread, 3 plcs
M6 thread, 2 plcs
7.1 (0.28) dia.,
4 plcs
159
(6.25)
178
(7.00)
81
(3.19)
210 (8.25)
229 (9.00)

Curtis 1244 Manual, Rev. E 5
2 — INSTALLATION & WIRING: Controller
programmer into its connector, and (2) that the built-in Status LED is visible
only through the view port in the label on top of the controller.
To ensure full rated power, the controller should be fastened to a clean,
at metal surface with four 6 mm (1/4") diameter screws, using the holes pro-
vided. Although not usually necessary, a thermal joint compound can be used to
improve heat conduction from the controller heatsink to the mounting surface.
Working on electric vehicles is potentially dangerous. You should pro-
tect yourself against runaways, high current arcs, and outgassing from lead
acid batteries:
RUNAWAYS — Some conditions could cause the vehicle to run out of control.
Disconnect the motor or jack up the vehicle and get the drive wheels o
the ground before attempting any work on the motor control circuitry.
: If the wrong throttle type is selected with the programming device,
the vehicle may suddenly begin to move.
HIGH CURRENT ARCS — Electric vehicle batteries can supply very high power,
and arcs can occur if they are short circuited. Always open the battery
circuit before working on the motor control circuit. Wear safety glasses,
and use properly insulated tools to prevent shorts.
LEAD ACID BATTERIES — Charging or discharging generates hydrogen gas,
which can build up in and around the batteries. Follow the battery man-
ufacturer’s safety recommendations. Wear safety glasses.
☞
CAUTION

6 Curtis 1244 Manual, Rev. E
CONNECTIONS
Low Current Connections
ree low current connectors are built into the 1244 controller. ey are located
in a row on the top of the controller:
Pin 1 keyswitch input (KSI)
Pin 2 interlock input
Pin 3 Mode Select 1 input
Pin 4 Mode Select 2 input
Pin 5 Fault 1 output
Pin 6 Fault 2 output
Pin 7 emergency reverse input
Pin 8 pedal switch input
Pin 9 coil return input
Pin 10 forward input
Pin 11 reverse input
Pin 12 hour meter enable output
Pin 13 throttle: 3-wire pot high
Pin 14 throttle: pot low
Pin 15 throttle: 3-wire pot wiper or 0–5V
Pin 16 throttle: 2-wire 5kΩ–0 or 0–5kΩinput
Pin 17 main contactor driver output
Pin 18 auxiliary contactor driver output
Pin 19 reverse signal driver output
Pin 20 electromagnetic brake driver output
Pin 21 (not used)
Pin 22 emergency reverse check output
Pin 23 (not used)
Pin 24 (not used)
24 23 22 21 20 19 18 17 16 15 14 13
121110987654321
e 24-pin connector provides the logic control connections. e mating
connector is a 24-pin Molex Mini-Fit Jr. connector part number 39-01-2245
using type 5556 terminals.
24-pin 6-pin 4-pin
2 — INSTALLATION & WIRING: Controller

Curtis 1244 Manual, Rev. E 7
F1
B- B+M-
F2
STATUS
LED
CABLE-FREE ZONES
A 6-pin low power Molex connector is provided for the CAN Bus interface.
However, the CAN Bus option must be specified for this interface to be active.
e mating connector is a Molex Mini-Fit Jr. p/n 39-01-2065 using type 5556
terminals.
456
123
Pin 1 +15Vsupply (limited)
Pin 2 ground return (B-)
Pin 3 CAN H I/O line
Pin 4 L termination
Pin 5 H termination
Pin 6 CAN L I/O line
Power cables must not be routed over the indicated areas. Otherwise they
may interfere with the proper operation of sensitive electromagnetic compo-
nents located underneath.
e +15V supply should only be used with the CAN system or speed sensor
and not to power any other external systems.
e L and H terminations provide a 120Ωtermination impedance for
the CAN H I/O and CAN L I/O inputs if necessary. Refer to the Curtis CAN
Protocol Document to determine the proper termination for a given application.
A 4-pin low power connector is provided for the handheld 1313 programmer
or 1314 PC programming station. A complete programmer kit, including the
appropriate connecting cable, can be ordered from Curtis.
If a programmer is already available but has an incompatible cable, the
1244 mating cable can be ordered as a separate part: Curtis p/n 16185.
High Current Connections
Five tin-plated solid aluminum bus bars are provided for the high current connec-
tions to the battery (B+ and B-), the motor armature (M-), and the motor field (F1
and F2). ese bus bars incorporate threaded mounting studs designed to accept
mounting bolts. e B+, B-, and M- bus bars are threaded to accept M8 bolts to
bolts to a depth of 5/8". is simplifies the assembly
and reduces the mounting hardware necessary for the
power connections. e tightening torque applied to
the bolts should not exceed 16.3 N·m (12 ft-lbs) for
the M6 bolts or 20 N·m (15 ft-lbs) for the M8 bolts.
Exceeding these specifications could damage the bus
bars’ internal threads, resulting in loose connections.
2 — INSTALLATION & WIRING: Controller
a depth of 3/4". e F1 and F2 bus bars are threaded to accept M6
☞
CAUTION

8 Curtis 1244 Manual, Rev. E
2 — INSTALLATION & WIRING: Controller
WIRING: Standard Conguration
Figure 3 shows the typical wiring configuration for most applications. e
interlock switch is typically a seat switch, tiller switch, or foot switch.
Standard Power Wiring
Motor armature winding is straightforward, with the armature’s A1 connection
going to the controller’s B+ bus bar and the armature’s A2 connection going
to the controller’s M- bus bar.
e motor’s field connections (F1 and F2) to the controller are less ob-
vious. e direction of vehicle travel with the forward direction selected will
depend on how the F1 and F2 connections are made to the controller’s two field
terminals and how the motor shaft is connected to the drive wheels through
the vehicle’s drive train.
Fig. 3 Standard wiring configuration, Curtis 1244 controller.
B- B+M- F2F1
INTERLOCK
5 kΩ–0 THROTTLE
(TYPICAL)
FORWARD
MAIN
CONTACTOR
COIL
POLARITY
PROTECTION
DIODE
REVERSE
MODE SELECT 2
MODE SELECT 1
B+
B-
KEYSWITCH
POWER
FUSE
A
MAIN
CONTACTOR
A2 A1
F1 F2 CONTROL
FUSE

Curtis 1244 Manual, Rev. E 9
2 — INSTALLATION & WIRING: Controller
Standard Control Wiring
Wiring for the input switches and contactors is shown in Figure 3; the connector
is shown in more detail below.
e main contactor coil must be wired directly to the controller as shown in
Figure 3. e controller can be programmed to check for welded or missing
main contactor faults and uses the main contactor coil driver output to remove
power from the controller and motor in the event of various other faults. If the
main contactor coil is not wired to Pin 17, the controller will not be able
to open the main contactor in serious fault conditions and the system will
therefore not meet EEC safety requirements.
121110987654321
24 23 22 21 20 19 18 17 16 15 14 13
INTERLOCK
ELECTRO-
MAGNETIC
BRAKE
DRIVER
REVERSE
SIGNAL
DRIVER
EMERGENCY
REVERSE
CHECK
(factory option)
FAULT
2
FAULT
1
HOUR
METER
REVERSE
24-pin detail (see Fig. 3):
EMERGENCY
REVERSE
(walkies only)
AUX
CONTACTOR
DRIVER
MAIN
CONTACTOR
DRIVER
POT
WIPER
POT
HIGH
POT
LOW
2-WIRE
POT
(5 kΩ)
PEDAL
SWITCH
KEYSWITCH
INPUT (KSI)
FORWARD
MODE
SELECT
2
MODE
SELECT
1
COIL
RETURN

10 Curtis 1244 Manual, Rev. E
2 — INSTALLATION & WIRING: Throttle
WIRING: Throttle
Various throttles can be used with the 1244 controller. ey are categorized
as one of five types in the programming menu of the handheld programmer.
Type 1: two-wire 5kΩ–0 throttles
Type 2: 0–5V throttles, current source throttles, three-wire potentiometer
throttles, and electronic throttles—wired for single-ended operation
Type 3: two-wire 0–5kΩthrottles
Type 4: 0–5V and three-wire potentiometer throttles—wired for wig-
wag-style operation
Type 5: CAN-Nodes throttles
e operating specifications for these throttle types are summarized in Table 1.
All throttle fault protection is accomplished by monitoring the wiper input.
is provides throttle fault protection that meets all EEC requirements. us,
no additional fault protection is required on any throttle type used with the
1244 controller.
Table 1 THROTTLE WIPER INPUT: THRESHOLD VALUES
MINIMUM THROTTLE HPD THROTTLE MAXIMUM
THROTTLE THROTTLE DEADBAND (25% throttle MAX THROTTLE
TYPE PARAMETER FAULT (0% throttle) active range) (100% modulation) FAULT
1Wiper Voltage 0.1 V 3.3 V 1.0 V 0.2 V 4.4 V
Wiper Resistance — 5.0 kΩ3.8 kΩ0 kΩ7.5 kΩ
2Wiper Voltage (none) 0.2 V 1.4 V 5.0 V 5.5 V
Wiper Resistance — — — — —
3Wiper Voltage 0.1 V 0.2 V 1.0 V 3.3 V 4.4 V
Wiper Resistance — 0 kΩ1.3 kΩ5.0 kΩ7.5 kΩ
4Wiper Voltage 0.5 V 2.5 V (fwd)*3.1 V (fwd) 4.4 V (fwd) 4.5 V
2.5 V (rev)*1.9 V (rev) 0.6 V (rev)
Wiper Resistance 0.5 kΩ2.5 kΩ(fwd)*3.1 kΩ(fwd) 4.4 kΩ(fwd) 4.5 kΩ
2.5 kΩ(rev)*1.9 kΩ(rev) 0.6 kΩ(rev)
5Wiper Voltage N/A N/A N/A N/A N/A
Wiper Resistance N/A N/A N/A N/A N/A
Notes: The Upper and Lower Deadbands are valid for nominal 5kΩpotentiometers or 5V sources with the
default Throttle Deadband and Throttle Max parameter settings of 0% and 100% respectively. These
values will change with variations in the Throttle Deadband and Throttle Max parameter settings—see
Section 3, pages 30 and 32.
The HPD threshold is a percentage of the active throttle range, which is dependent on the pro-
grammed Throttle Deadband and Throttle Max settings. The default HPD Threshold is 25%; the
programmable range is 0–25%.
*With 0% Throttle Deadband, there is no neutral point on a Type 4 throttle. It is recommended that
an 8% minimum deadband be used with Type 4 throttles.

Curtis 1244 Manual, Rev. E 11
2 — INSTALLATION & WIRING: Throttle
Wiring for various throttles is described below. : In the text, throttles
are identified by their nominal range and not by their actual operating range.
If the throttle you are planning to use is not covered, contact the Curtis
office nearest you.
5kΩ–0 Throttle (“Type 1”)
e 5kΩ–0 throttle (called a “Type 1” throttle in the programming menu of
the handheld programmer) is a 2-wire resistive throttle that connects between
the 2-Wire Pot and Pot Low pins (Pins 16 and 14), as shown in Figure 4. It
doesn’t matter which wire goes on which pin. For Type 1 throttles, zero speed
corresponds to a nominal 5 kΩmeasured between the two pins and full speed
corresponds to 0Ω. (: is wiring is also shown in the standard wiring
diagram, Figure 3.)
Fig. 4 Wiring for 5k Ω –0
throttle (“Type 1”).
In addition to accommodating the basic 5kΩ–0 throttle, theType 1 throttle
can also be used to implement a wigwag-style throttle. Using a 20kΩpot wired
as shown in Figure 5, the pot wiper can be set such that the controller has 5 kΩ
between Pins 16 and 14 when the throttle is in the neutral position. e throttle
mechanism can then be designed such that rotating it either forward or back
decreases the resistance between Pins 16 and 14, which increases the controller
output. e throttle mechanism must provide signals to the controller’s forward
and reverse inputs independent of the throttle pot resistance. e controller
will not sense direction from the pot resistance with rottle Type 1. For true
Fig. 5 Wiring for 20k Ω
potentiometer used as part
of a wigwag-style throttle
(“Type 1”).
14 1315161718192021222324
121110987654321
5kΩ–0
Pin 16
Pin 14
2-Wire Pot
Pot Low
PIN KEY
FASTER
14 1315161718192021222324
121110987654321
20 kΩ
Pin 16
Pin 14
2-Wire Pot
Pot Low
PIN KEY
FASTERFASTER

12 Curtis 1244 Manual, Rev. E
14 1315161718192021222324
121110987654321
14 1315161718192021222324
121110987654321
+
-
+
B-
Pin 15
0–5V Input
PIN KEY
Pin 15
Pin 14
0–5V Input
Pot Low
PIN KEY
SENSOR GROUND
SENSOR OUTPUT (0–5V)
SENSOR
2 — INSTALLATION & WIRING: Throttle
wigwag-style control—without the necessity of providing independent forward
and reverse input signals—see rottle Type 4.
If the total resistance between Pins 14 and 16 is greater than 7.5 kΩ, the
controller’s 4.4 V upper fault limit will be exceeded and the controller output
will be disabled. is provides broken wire protection, and also serves as an
indication that the potentiometer’s nominal value has increased and the pot
needs to be replaced.
0–5V, 3-Wire Potentiometer, Current Source,
and Electronic Single-Ended Throttles (“Type 2”)
With these throttles (“Type 2” in the programming menu) the controller looks
for a voltage signal at the wiper input (Pin 15). Zero speed will correspond to
0V and full speed to 5 V. A 3-wire pot, voltage source, voltage sensor, or current
source can be used with this throttle type. e wiring for each is slightly dierent.
0–5V rottle
Two ways of wiring the 0–5V throttle are shown in Figure 6. e active range
for this throttle is from 0.2V (at 0% rottle Deadband) to 5.0 V (at 100%
rottle Max), measured relative to B-.
Fig. 6 Wiring for
0–5V throttles (“Type 2”).
(b) Ground-referenced
0–5V throttle
(a) Sensor-referenced
0–5V throttle

Curtis 1244 Manual, Rev. E 13
2 — INSTALLATION & WIRING: Throttle
3-Wire Potentiometer (1k Ω –10k Ω ) rottle
e 3-wire potentiometer is used in its voltage divider mode, with the voltage
source and return being provided by the 1244 controller. Pot High (Pin 13)
provides a current limited 5V source to the pot, and Pot Low (Pin 14) provides
the return path. e pot wiper is then connected to the Wiper Input (Pin15).
If a 3-wire pot is used in the application, the controller will provide full throttle
fault protection in accordance with EEC requirements. Potentiometers with total
resistance values between 1kΩand 10kΩcan be used with rottle Type 2.
Wiring is shown in Figure 7.
Fig. 7 Wiring for 3-wire
potentiometer throttle
(“Type 2”).
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OFFON
1kΩ–10kΩ
Pin 15
Pin 14
Pin 13
Pot Wiper
Pot Low
Pot High
PINKEY
Current Sources As rottles
A current source can also be used as a throttle input, as shown in Figure 8. A
resistor, Rthrottle, must be used to convert the current source value to a voltage.
e resistor should be sized to provide a 0–5V signal variation over the full
current range.
Fig. 8 Wiring for current
source throttle (“Type 2”).
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Rthrottle
B-B-
source
Pin 15 0–5V Input
PIN KEY
I

14 Curtis 1244 Manual, Rev. E
2 — INSTALLATION & WIRING: Throttle
Fig. 9 Wiring for Curtis
ET-XXX electronic throttle
(“Type 2”).
Curtis ET-XXX Electronic rottle
e Curtis ET-XXX provides a 0–5V throttle and forward/reverse inputs for
the 1244 controller. Wiring for the ET-XXX is shown in Figure 9.
e ET-XXX can be integrated into a control head to provide wigwag-style
throttle control. Alternatively, a complete control head assembly is available
from Curtis. is control head assembly—the CH series—combines the ET-
XXX throttle with a variety of standard control head switch functions for use
in walkie and lift truck applications.
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GREEN
ORANGE
BLACK
BLACK/WHITE
WHITE
WHT/BRN
B+
KEYSWITCH
connector
WHT/
GRN
Pin 15
Pin 11
Pin 10
Pin 1
0–5V Input
Reverse
Forward
KSI Input
PIN KEY
B-
ET-XXX
B-