RDP DR7AC - General Connections and Internal Controls; DR7 AC Connections Overview; Accessing DR7 AC Internal Controls

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2.3 Connections General
Transducer, supply and output connections are
made by 4 x 4 way screw-clamp terminals as
shown in Fig 1.
To reverse output polarity, reverse signal
hi/signal lo. Voltage output is between Volts Out
and common, current output is between current
out and common. Output common is internally
connected to Excitation Lo.
WARNING: INCORRECT SUPPLY
CONNECTION, e.g. CONNECTING SUPPLY
WIRE TO OUTPUT (O/P) MAY DAMAGE THE
UNIT AND INVALIDATE THE WARRANTY.
Fig. 1 Connections
1
Excitation Hi
2
Excitation Lo
3
Signal Lo
4
Signal Hi
5
Screen
6
Master
7
Slave
8
m/s comm
9
Volts Out
10
Common
11
Common
12
Current Out
13
Supply +
14
Supply -
15
Screen
16
N/C
2.4 Internal Controls
To access internal controls the front part of the DR7AC case needs to be removed. To do
this, use a small screw driver to gently press in the clips behind terminal 1-4 and 13-16. At
the same time pull forward the front of the case. The front of the case and pcb assembly
should now slide forward.
It will usually only be necessary to make changes to Gain and Zero controls.
Fig. 2 Internal Controls
To put case back together, gently slide pcb assembly into case guide slots. Ensure pcb
earth pad CG1 is lined up with the earth clip inside the case, and push back until the front
of the case clicks back into place.
Jumper J1
Exc. Freq.
Jumper J3, Exc. Volt.
Jumper J2
Master/Slave
Location for
Bridge
Completion
Resistors
Coarse
Gain
Control
Coarse
Zero Control
& Zero Input
Switch