Curtis 906 User 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 self-
discharge 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
6Artwork Options 7
Letter
Code Signal
ANo option
B1Both output & memory options
C1Both output & memory options and CTR reset instead of HVR
DOutput option only
MMemory 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