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WaveBook/512 and WaveBook/512H
03-06-02
System Setup and Power Options 2-15
4.
Change the selection, if required. If you do not need 28 V, SW2 should be in the default position
(14 VDC).
5.
Replace the top cover, and secure with screw.
Power
Connection. The figure shows the pinout for the POWER OUT DIN5 connector.
The 28 V pin is only active in the 28 VDC mode; however, the 14 V pin is active
regardless of the mode selected.
The CA-115 cable connects to DBK30A’s POWER OUT connector and
WaveBook’s POWER IN connector. The cable can be used to daisy-chain a
DBK30A unit to a WBK expansion module.
D IN 5 P ow e r O u t
+1 4 V
+2 8 V
G N D
28 VDC Mode. The primary purpose of the 28 VDC mode is to provide power for external loop
transmitters. The hookup is simple, as shown below.
W aveB o ok
2-W ire
T/C X M TR
2-W ire
Flow X M TR
T /C
4 -2 0 m A
4 -2 0 m A
C O M
+
+
2 5 0
Ω
2 5 0
Ω
N
N
C o n ne c tin g L o o p Tra n sm itter s
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.
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