Curtis 906 Instructions Manual

MODEL 906

Battery “Fuel” Gauge

Read Instructions Carefully!

®

SAFETY INSTRUCTIONS

This instrument was manufactured and tested according to the
applicable technical standards. It complies with all the safety
regulations as shipped from the factory.

Installation and startup must be performed by skilled personnel.

Failure to install and operate the unit in accordance with these
instructions may result in damage or injury.

If safe operation of the instrument can no longer be ensured,
stop and secure it against accidental operation.

If instrument failure or malfunction may cause personal injury
or material damage, use additional safety measures such as
limit switches, guards, etc.

Read the Operating Instructions carefully before startup.

Note the safety instructions marked with this
warning symbol in this manual!

TABLE OF CONTENTS

1. Model Encodement 2

2. Technical Specifications

2.1 Electrical 6

2.2 Mechanical 6

2.3 Environmental 7

3. Installation 8

4. Operation

4.1 Display 9

4.2 Reset 10

5. Troubleshooting 11

6. Maintenance 12

7. Warranty 13

2

Example: Model 906 D 24 M C D A O

Case Style

Voltage

Reset

Discharge

Output

Special

Options

1 3 5

2 4 6

Artwork

7

Case Style Options

1

12

24

36

48

Voltage
Options

2

1. MODEL ENCODEMENT

D DIN case – rectangular

F Hex bezel w/1/4” spade terminals (enGage I)
J Hex bezel w/Packard connector (enGage I)

N DIN case - rectangular, snap-fit

P Pin mount (module)
R 52mm Round bezel & case (same as 700Q)
T Hex bezel w/3/16” spade terminals (enGage I)

TX Hex bezel w/3/16” spade terminals (old T case)

Y Rectangular bezel w/Packard connector (enGage I)
Z Rectangular bezel w/1/4” spade terminals (enGage I)

3

Reset Profile Options

3

Profile with

Memory Option

Profile without

Memory Option

Volts per Cell

OCR HVR CTR Full

CTR

Empty

K 1.928 2.167 2.167 2.10

J N/A 2.167

Y 2.083 2.167 2.167 2.10

N 1.980 2.230 2.230 2.10

E N/A 2.230

T 2.028 2.280 2.28 2.10

L N/A 2.280

D 2.060 2.320 2.32 2.10

P N/A 2.320

B 2.090 2.350 2.35 2.10

H N/A 2.350

C 2.135 2.400 2.400 2.10

M N/A 2.400

F N/A 2.416

4

Discharge Profile Options

4

Note: This gauge is not intended to measure the state-of-charge of batteries
subject to extended periods of inactivity since it does not account for self­discharge effects. Consult factory for details.

Letter Code

Volts per Cell

Full Empty

G 1.97 1.75
H 1.97 1.70

J 1.97 1.63

K 2.01 1.65

L 2.10 1.92

M 2.00 1.83

N 2.04 1.73
P 2.08 1.98
Q 2.10 1.88
R 2.02 1.90
S 2.08 1.85
T 2.03 1.90
V 1.98 1.85

W 2.02 1.85

X 1.95 1.75
Y 2.00 1.90

5

Letter Code Logo

O Curtis
N None

Special Options

A = (TBD)

Output Options

5

6

Artwork Options

7

Letter

Code

Signal

A No option

B

1

Both output & memory options

C

1

Both output & memory options and CTR reset instead of HVR

D Output option only

M Memory option only

1

option is for micro versions only

6

2. TECHNICAL SPECIFICATIONS

2.1 Electrical Operating Voltage

Operating Range: ±25% of nominal voltage

Operating Current

2.2 Mechanical Display

10-digit
Red LED
Tri-color (5 green, 3 yellow, 2 red)

Voltage

(VDC)

Nominal Current

(mA)

Maximum Current

(mA @B

+

+25%)

12 23 38

24 17 24

36 16 22

48 16 21

7

Recommended Panel Cutouts

F, J, T, TX, Y, Z Cases: 36.8 mm x 24.1 mm
+0.3/-.0mm
D, N Cases: 45.3 mm x 22.3 mm ±0.1
R Case: 52.4 mm

Terminals

D, N, T, TX: 3/16” blade
R, F, Z: 1/4” blade
J, Y: 4-pin Packard Connector equivilent to
Delphi PN 15336035
P: Solder pins

2.3 Environmental Temperature

Operating: –40 to +85°C

Storage: –50 to +90°C

Humidity: 95% RH non-condensing at 38°C

Shock and Vibration: Meets SAE J 1378

8

3. INSTALLATION

Connecting Model 906

Pin 1 = Battery +

Connects to the vehicle’s main positive (+) terminal.
Use as short a wire as practical.

Pin 2 = Battery –

Connects to the vehicle’s main negative (–) terminal
Use as short a wire as practical.

Note: Pins 1 & 2 are connected across the total
battery pack.

Pin 3 = Output Signal + or No Option

Output Signal option: 5 VDC ±0.5 VDC (90 µA
current source) above Empty, 0-0.1 VDC at Empty
1 VDC maximum (90 µA sink);
No Option: Pin 3 is left open.

Pin 4 = Keyswitch

Connects to Battery + through the switched terminal
of the keyswitch.

9

4. OPERATION

4.1 Display

1. Only when the battery is properly charged is the
right-most LED lit.

2. As the battery’s state-of-charge decreases,
successive LEDs light up, only one on at a time.

3. The 2nd-from-left LED flashes, indicating “energy
reserve” (70% depth of discharge).

4. The 2 left-most LEDs alternately flash, indicating
“empty” (80% depth of discharge).

4

3

2

1

4 3

2

1

10

4.2 Reset

OCR (Open Circuit Reset)

Upon reconnection of a battery the gauge will reset
if it measures 2.09 volts/cell or higher (example “B”
profile) (for units with memory option).

HVR (High Voltage Reset)

Gauge must measure >2.35 volts per cell for 6
continuous minutes during charging (example
“B” profile).

CTR (Charge Tracking Reset)

Display tracks charge level during opportunity
charging (requires gauge to be connected to
battery when charging).

11

5. TROUBLESHOOTING

The following checklist should help you troubleshoot any
problem with Model 906.

Problem Possible Cause

Keyswitch on and no display Terminals not connected or improper voltage;

Keyswitch not high

Stays at Full Model 906 voltage does not match battery

voltage

Will not reset Model 906 voltage does not match battery

voltage or battery not fully charged

Reset without terminals
charging battery

Not connected directly to battery

Empty too soon Model 906 voltage does not match battery

voltage or terminals not connected directly
to battery

12

6. MAINTENANCE

Curtis Model 906 series is not field serviceable. Return
defective units to your distributor for warranty coverage.

13

7. WARRANTY

Curtis Instruments’ products and/or components are
guaranteed against defects in workmanship and material for
a period of one year, or as defined in the individual product
literature, from date of shipment from our factory, when applied
in a proper application within specified ratings. This guarantee
is limited to repairor replacement F.O.B. our factory. There
is no further warranty or implied representation, guarantee,
promise or agreement as to any Curtis Instruments product
and/or component. Curtis Instruments, Inc., cannot assume
responsibility or accept invoices for unauthorized repairs to
its products and/or components,even though defective. In no
case will Curtis Instruments’ responsibility extend to products,
components or equipment not of its manufacture. Under no
circumstances shall Curtis Instruments, Inc., be liable for any
special or consequential damages or loss of profits or other
damages. Returned goods will not be accepted unless
identified by a Curtis Return Material Authorization (RMA).

All specifications are subject to

change without notice.

CURTIS INSTRUMENTS, INC.

200 Kisco Ave.

Mount Kisco, New York 10549

914-666-2971 Tel

914-666-2188 Fax

www.curtisinstruments.com

53015 Rev. H 9/14