DBK34 Vehicle UPS Module
Overview …… 1
Hardware Setup …… 2
Configuration …… 2
Connection …… 3
DBK34 Operation …… 3
Environmental Concerns …… 4
Fuse Replacement …… 4
DBK34 – Specifications …… 5
DBK34 is similar to DBK34A in appearance and operation; but there are differences. Before
proceeding with this section, verify that your device is a DBK34. If your device has an “A”
suffix, use the document module regarding the DBK34A UPS /Battery Module instead of this
document module.
Reference Notes:
o Chapter 2 includes pinouts for P1, P2, P3, and P4. Refer to pinouts applicable to your
system, as needed.
o In regard to calculating system power requirements, refer to DBK Basics located near
the front of this manual.
Overview
The DBK34 can power a data acquisition system in portable and in-vehicle applications (both 12 and 24 V
systems). Power storage capacity is 5 A-hr @ 12 VDC or 2.5 A-hr @ 24 VDC.
For reliable data acquisition in a vehicle, the DBK34 provides clean and consistent operating power:
• Prior to engine/generator start
• During engine start-up (battery sag due to the high-current demand of starter motor and
solenoid)
• After engine turn off.
DBK34 Front Panel
The DBK34 contains two sealed-lead rechargeable batteries and associated charging circuits and current
indicators. Typically, these batteries can last more than 500 full cycles and up to 10 years standby lifetime
at room temperature. Recharging is fast, and extreme temperature performance is good. The DBK34 can
be used with the LogBook, DaqBook, WaveBook, and related DBKs and WBKs. The unit’s rugged metal
package has a compatible 8×11” footprint for convenient stacking with dual-lock tabs and optional splice
plates and handles for carrying.
DBK Option Cards and Modules 879795 DBK34, pg. 1
Main and auxiliary power input comes from 12 or 24 VDC via a terminal block on the unit’s front panel
(12 or 24 V modes are set by front-panel jumpers). Automatic charging circuits recharge the internal
batteries quickly and safely. For trouble-free operation, you must fully charge the batteries before use.
The charged battery runtime will depend on the load and mode of operation.
Note: TB1 pin numbers read from right to left as viewed from the front panel.
Hardware Setup
Configuration
The DBK34 is configured for 12 volt or 24 volt operation via placement of jumpers on the front panel’s
screw-terminal block (TB1).
For 12 Volt Operation:
(1) Remove jumper from terminals 8 and 7, if present.
(2) Use a jumper to short terminals 9 and 8
(3) Use a jumper to short terminals 7 and 6
From left to right, when viewed from the front panel, DBK34’s screw-terminal numbers
read: 9, 8, 7, 6, 5, 4, 3, 2, 1. Thus, Aux Batt (+) is screw –terminal 1. See following
figure.
For 24 Volt Operation:
(1) Remove jumpers from terminals 9 and 8, if present
(2) Remove jumpers from terminals 7 and 6, if present.
(3) Use a jumper to short terminals 8 and 7
DBK34, pg. 2 879795 DBK Option Cards and Modules
Connection
Power In - (vehicle main/auxiliary batteries, 12 or 24 VDC only) Connect main battery positive to
terminal 3 of TB1 and main negative to terminal 4. If an auxiliary battery is used, connect its positive to
terminal 1 and negative to terminal 2.
Power Out - The pinout at the right applies to DBK34’s
two POWER OUT DIN5 connectors.
DBK34 Operation
Indicators: 3 LEDs on the DBK34 provide status information on the power and charging process.
LED Meaning
MAIN POWER Lights when the DBK34 is connected to a live vehicle (main) battery.
CHARGING Lights when internal batteries are being charged at a rate of 0.025 to 0.050 A or greater.
DISCHARGING Lights when internal batteries are discharging at a rate of 0.025 to 0.050 A or greater.
Runtime: Approximate runtime under various loads can be computed from the storage capacity
(5 A-hr in 12 V mode; 2.5 A-hr in 24 V mode) and the load (main unit and other DBKs).
The following graph of Load vs. Battery Life is for a typical new battery that is initially at full charge.
Charging: In general, lead-acid batteries require charging at 120% of drain energy (e.g., the 5 A-hr
DBK34 requires a charge equal to or greater than 6 A-hr). Charging times vary; but 4 to 5 hours at 14 V
are typical for a totally empty battery.
CAUTION
Voltage applied to charge a DBK34 must not exceed 15 VDC in 12 V mode, or
30 VDC in 24 V mode. If not charging from the vehicle, use of a generic automobile
battery charger (3 A) in 12 V mode is recommended.
DBK Option Cards and Modules 879795 DBK34, pg. 3
Environmental Concerns
Fuse Replacement
DBK34 contains four glass fuses that can be replaced by the user. Note that you should always check your
unit for blown fuses prior to sending it back to the factory for repair. This could save you time and money.
The following table indicates the probable reason that a particular fuse may have blown, and includes part
numbers and amperage.
Fuse Rating Probable Cause of Blowing Fuse Replacement Fuse
F1 15 A Overload on input power. 15A, 32V, LITTLEFUSE# 311015
F2 8 A Output overload. 8A, 32V, LITTLEFUSE# 312008
F3 8 A Output overload. 8A, 32V, LITTLEFUSE# 312008
F4 8 A Auxiliary Battery overload. 8A, 32V, LITTLEFUSE# 312008
CAUTION
The DBK34’s batteries contain toxic materials (Pb and H2SO4). After the battery’s
life cycle is over (up to 500 full cycles or 5-10 years of use), sealed-lead batteries
must be recycled or properly disposed of.
DBK34 Fuse Locations
To replace a fuse:
1. Disconnect the DBK34 from loads and from supply power.
2. Remove the DBK34’s cover plate. This requires the removal of 4 screws.
3. Examine the fuses (F1 through F4) to see which, if any, have blown. Note that you can usually see
the blown element through the fuse’s glass body.
4. Replace the blown fuse with the appropriate replacement fuse (see preceding table).
5. Replace the DBK34 cover and secure with screws (removed in step 2).
DBK34, pg. 4 879795 DBK Option Cards and Modules
DBK34 - Specifications
Name/Function: Vehicle UPS Module
Battery Type: Sealed-lead rechargeable
Number of Battery Packs: 2
Battery Pack Configuration: 6 series-connected D cells
Output Voltage: 12 V or 24 V (depending on jumpers)
Output Fuses: 8 A on each internal battery (2)
Input Fuses: 8 A for auxiliary battery, 15 A for vehicle battery
Battery Capacity (Amp-Hours):
5 A-hr in 12 V mode (parallel)
2.5 A-hr in 24 V mode (series)
Operating Temperature: -20°F to 122°F (-29°C to 50°C)
Size: 8½ × 11 × 1¾ in. ( 216 × 279 × 44 mm)
Weight: 7.2 lb (3.27 kg)
DBK Option Cards and Modules 879795 DBK34, pg. 5
DBK34, pg. 6 879795 DBK Option Cards and Modules
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