Curtis 933/3 Battery Controller
INSTALLATION AND USE
The Curtis Model 933/3D series of battery controllers are designed to monitor a battery’s usage and provide a means of driving a dash display “fuel” gauge and disabling the lift function of a truck. The 933/3D will flash the red LED of the gauge at 75% discharge and it will disable the lift at 80% discharge.
All 933/3D’s repaired by FSIP are set so that they will reset upon their first installation in the truck, no matter what the actual battery voltage. If the unit is installed as shown below, they should show full battery and the lift function should be enabled.
The point at where the LIFT LOCK-OUT occurs is adjustable and is set by the “DISCHARGE” pot. Typically the 933/3D will be set at the ‘N’ setting. See the table below for values of the other settings.
The point at where the RESET occurs is adjustable and is set by the “RESET” pot. Typically the 933/3D will be set at the ‘B’ setting. See the table below for values of the other settings.
Volts per cell
DISCHARGE |
RESET |
|||||||||||
P |
O |
N |
M |
L |
K |
Beyond K |
E |
D |
C |
B |
A |
Beyond A |
1.82 |
1.78 |
1.73 |
1.68 |
1.63 |
1.57 |
1.56 |
2.18 |
2.15 |
2.12 |
2.09 |
2.06 |
2.00 |
FSIP RESET AND DISCHARGE LEVEL SETTINGS
933/3D 12 |
933/3D 18 |
933/3D 24 |
933/3D 36 |
933/3D 40 |
933/3D 48 |
933/3D 72 |
|
| DISCHARGE | 10.7V |
16.2V |
21.3V |
32.0V |
34.9V |
42.7V |
64.1V |
| RESET | 12.6V |
18.8V |
25.2V |
37.8V |
43.6V |
50.4V |
75.6V |
NOTE: A 933/3D will not reset unless the battery voltage meets or exceeds the values listed in the table above. If a unit will not reset, you must measure the actual battery volts then reduce the reset pot setting. Then after reducing the adjustment, you must UNPLUG THE BATTERY AND RECONNECT IT for the change to be accepted. Changing the reset pot while the battery is connected will have NO EFFECT until the battery is DISCONNECTED. If the unit will not reset, you must make sure that the battery voltage is greater than or equal to 2.00Volts per cell. At this point you can determine if the battery is not charging to a high enough voltage or if the 933/3D is actually defective.
If you call to return a presumably defective 933/3D to FSIP, you will be asked if the actual battery volts was measured with a voltmeter and if an attempt was made to adjust the RESET and DISCHARGE pots.
