Measurement Computing WaveBook rev.3.0 - Manual (Page 90)

4-6 System Power & Assembly WaveBook User’s Manual
Another use of the 28 VDC mode is to provide excitation for bridge-type sensors, such as load cells (strain
gages) and other devices that may be attached to 5B modules inside a WBK15.
Excitation voltage from DBK30A is not regulated by the unit, and must therefore be
regulated externally. For most load cells, excitation voltage should be regulated to 10 V.
Charging. To charge the DBK30A batteries:
1. Connect the adapter to DBK30A’s POWER IN connector.
2. Plug the adapter into the AC power receptacle.
Note that the charge cycle will begin automatically whenever AC power is applied after an interruption.
The charge cycle will automatically end when the batteries are fully charged.
Charging DBK30A’s Batteries
3. To manually initiate a charge cycle, press the START CHARGE momentary rocker-arm switch. Note
that subsequent charge cycles applied to a fully-charged DBK30A will have no ill effect. The module
will sense the fully-charged status and revert to the trickle-charge state within a few minutes.
Three LEDs on the DBK30A provide status information on the charging process or the external load.
LED Indicators & Descriptions
POWER IN Indicates the charger is connected to a source of AC power and to the battery module.
BATTERY CHARGING Steady Light - Indicates the battery is in the high-current (2 A) charge mode.
Flashing - One or two flashes at a time indicates the batteries are fully charged.
POWER OUT Indicates power is flowing out to an external device, such as a WaveBook product.
CAUTION CAUTION CAUTION CAUTION
Periodically, fully discharge the DBK30A to inhibit “lazy chemistry” (memory) in the
nickel-cadmium cells. To manually discharge a battery pack, connect a WaveBook to
the pack and leave it powered-on until the indicator lights go out.
Use While Charging. Both operating modes are capable of powering the WaveBook products while being
charged; however, the charging current is reduced, and charging time is increased. If AC power is
interrupted, a new charge cycle will begin automatically when AC power returns.
CAUTION CAUTION CAUTION CAUTION
Even with the AC adapter, the batteries will eventually discharge under a WaveBook
operating load. Charging DOES NOT BEGIN AUTOMATICALLY (except on power-
up). You must manually initiate the next charge cycle. Do not expect a WaveBook
powered by a DBK30A to operate as an uninterruptable power supply.
Stacking Modules
Stacking can be accomplished with the included splice plates, discussed on page 4-10.
DBK30A – Specifications
Name/Function: Rechargeable Battery Module
Battery Type: Nickel-cadmium
Number of Battery Packs: 2
Battery Pack Configuration: 12 series-connected sub-C
cells
Output Voltage: 14.4 V or 28.8 V (depending on the
selected mode)
Output Fuses: 2 A
Battery Amp-Hours: 3.4 A-hr (1.7 A-hr/pack)
Charge Termination: Peak detection
Charge Time: 2 hours
Charging Voltage from Supplied AC Adapter: 22 to 26
VDC @ 2 A
AC Adapter Input: 95 to 265 VAC @ 47 to 63 Hz
Size: 221 mm × 285 mm × 35 mm
(11" × 8-1/2" × 1-3/8")
Weight: 2.4 kg (6 lb)