geotomographie SBS42 User manual

Manual
for
P-wave sparker
SBS42
and
S-wave source
BIS-SH
[email protected] Tel.: [phone]

Borehole Sources SBS-42/BIS-SH
and
Impulse Generator IPG5000
Operating and Maintenance Manual
1. Impulse generator 4
1.1 Connections at IPG5000 and set-up 5
2. Remote control unit 9
2.1 Function and operating of remote control 10
2.1.1 Generator control 10
2.1.2 Impulse control 10
2.1.3 Trigger 11
3. Downhole equipment 11
3.1 P-Wave probe SBS42 12
3.2 S-Wave probe BIS-SH 13
4. Operation and Maintenance Instructions 17
4.1 Impulse generator and remote control unit 17
4.1.1 Preliminary works 17
4.1.2 . Impulse operation control (EXTERN) - controlled by remote unit 18
4.1.3 Impulse operation control INTERN 19
4.1.4 Setting OFF operation 19
4.2 SBS42probe 20
4.3 BIS-SH probe 20
4.3.1 Clamping pressure for BIS-SH probe 21
4.3.2 Orienting the BIS-SH probe 21
4.4 Surface cable and quick connector 23
5. Trouble shooting 24
5.1 Check triggering 24
5.2 SBS42 test arrangement 25
5.3 Tomography arrangement 26
5.4 Crosshole arrangement 26
5.5. General checks 27

Precautions
for
Operation of high voltage equipment type SBS42 and BIS-SH
Like other seismic sources as explosives, air guns or weight dropping systems,
operating of an electrical spark or other high-voltage impulse sources requires several
precautions. The most important precautions are:
1. Impulse generator operation only by authorised personnel.
2. Do not connect or disconnect cables whilst impulse generator
is switched ON. Switch OFF impulse generator before
disconnecting cables or connectors.
3. Do not touch cables or sparker probe while the impulse
generator is in operation.
4. Ground the impulse generator by means of grounding hook
before switching ON.
5. Do not expose impulse generator or connectors to water or
dust.
6. Do not charge impulse generator over 5.300 V !
7. Do not open impulse generator or remote control.
Maintenance has to be carried out by authorised personnel.
8. In case of any malfunction or emergency switch OFF impulse
generator by pressing the red OFF button at generator or turn
key switch OFF at remote control.

Moreover observe the following:
•Check cables and connectors before and after every field survey for damage.
•Do not use damaged cables.
•Do not open the impulse generator if connected to power source.
•Any repairs or maintenance work has to be carried out only by authorised
personnel.
•All connections should be dry to avoid a flash over inside the connector.
Take care that no water e.g. rain can get into connectors.
•If an impulse is released without a spark action the cable can be charged with high
voltage like a small condenser. This energy has to be discharged by switching OFF
the impulse generator. Check this by observing the HV-meter. Wait until the
voltmeter at impulse generator shows a voltage of nearly 0 volt!
•High voltage discharges slowly (about 1 - 2 minutes). Wait until the voltmeter at
impulse generator shows a voltage of nearly 0 volt!
1. Impulse generator
The impulse generator IPG5000 is the high voltage power supply to the seismic
sparker probe SBS42 or BIS-SH. Figure 1 shows the impulse generator and its remote
control RCU.
Fig. 1: Impulse generator IPG and remote control unit RCU.

The IPG5000 needs to be powered by external 230 V / 50 Hz or optional 115 V / 60
Hz. If voltage drops below 210 V the system is not operating. Output energy of the
IPG5000 is 1000 J @ 5000 V.
Impulses can be released in single or continuous mode either by using the remote
control unit RCU or by using the controls at the IPG5000 control panel. The HV-output
has no direct contact to the generator housing, i.e. the terminals +HV and -HV are
connected to housing and ground via two resistors of 15 Meach.
To prevent electromagnetic interference the generator should be operated in a
certain distance to the seismograph. Avoid crossing cables.
Attention:
The impulse generator must be protected from any wetness, e.g. rain and dust!
Before switching “ON”the ground terminal of generator must be connected to
ground using the grounding hook via the yellow-green cable. If the ground is
very dry add water to the grounding hook to enable a good soil contact.
1.1 Connections at IPG5000 and set-up
Following accessories for operation of the impulse generator are delivered:
1. Grounding hook with cable (colour yellow/green)
2. Power supply cable (grey) with connector (type suitable to national standards)
3. Remote control unit with cable (black)
4. High-voltage surface cable (big red cable) for connection between impulse
generator and borehole cable having a length of approx. 6 m equipped with a
coaxial quick connector (sleeve part) for connection to surface connector of the
borehole coaxial cable.
Please follow the instruction below to connect cables to IPG5000.
Connect the cables to the IPG5000 is in same order (from 1 to 4).
Do not connect power cable to external power supply. This shall be done at last
after setting up all other connections.
Disconnect the cables from the IPG5000 is in same order (from 4 to 1) but
switch off unit first and disconnect VAC.
NEVER disconnect while under operation or while the unit is charged.
Next, the borehole probe SBS42 or BIS-SH can be connected to the IPG5000 through
the big red HV cable (see chapter 5.3/5.4).

Fig. 2: Cable connections at IPG5000
Fig. 3: Details of connecting points at IPG5000 rear side
Fig. 4: Rubber fixation of HV connector at IPG5000

1
23
4567 8 9
Fig. 5: Control panel at IPG5000
At the front panel of the IPG5000 several control and push buttons are available (see
Fig. 5).
1. Voltmeter
2. Key switch (0=OFF, 1=ON)
3. Fuses (from left to right with 0.8 A, 4 A, 4 A)
4. EMERGENCY OFF
5. Voltage (230V) switch ON
6. High-Voltage switch ON
7. Single release button (only available for internal operation)
8. Shot sequence timer (fully left for single shots, fully right for 10 s shot release,
all other positions intermediate shot timing)
9. INTERN/EXTERN switch (to left = INTERN, to right = EXTERN for remote unit
controlled operation)
On emergency situations switch OFF the IPG5000 using the key switch (2) or press
red push button (4).

ON OFF M0,8/250C
(0,8Amedium slow) (4Aslow) (4Aslow)
T4/250E T4/250E
OFF ON HV-ON SINGLE- IMPULSE 4-7sec
IMPULSE GENERATOR
EXTERNINTERN
CONTI
FUSES
Fusefor Control 2xFusesfor H PartV
Fig. 6: Schematic diagram of the control panel at IPG5000
If all connections to IPG5000 are made, the remote control unit is connected AND
the source is connected and inside borehole one can start the high voltage
charging.
The switching ON sequence at the IPG5000 control panel is as follows:
1. Key switch to “1” (same at remote control unit)
2. Switch shot control at remote control unit to SINGLE
3. If external VAC is available the white push button lights
4. Press white push-button (5)
5. Green push button lights
6. Press green push-button (6)
7. High voltage charging starts
8. Avoid charging above 5300 V. Switch OFF if charging is above and adjust VAC
supply
Connection to downhole probe is established through the “quick” connector at the big
red HV cable. Just push in the probes coaxial cable connector and screw tightly.
Fig. 7: Connection between coaxial cable and big red HV cable at IPG5000

2. Remote control unit
The remote control unit fulfils following functions:
1. Switch ON the IPG5000
2. Emergency OFF for interrupting any operation
3. Shot release in SINGLE or CONTINUOUS mode
4. Impulse counting of released shots
5. Trigger signal output to seismograph
The remote control unit is connected to the IPG5000 by one cable. All electronic
circuits of the remote control unit (except the trigger circuit) are supplied by 24 V
delivered by the impulse generator via the cable.
The trigger circuit is supplied by a battery of 9 V.
Fig. 8: Controls at remote control unit

Fig. 9: Rear side of RCU with banana trigger and connector to IPG5000
2.1 Function and operation of the remote control unit
To use remote control mode, the switch at the IPG5000 has to be set to position
EXTERN. Remote Control is sub-divided into three panels.
2.1.1 Generator control (left panel at remote unit)
The key switch at the remote control unit must be set to “1” to start operation at the
IPG5000. Further, the EMERGENCY button must be in UP position.
In emergency case press “EMERGENCY OFF” button or switch to “0” the key
switch.
2.1.2 Impulse control (middle panel at remote unit)
The remote control unit is equipped with a counter for counting impulses. Shots can
be released in continuous or single mode.
To release a single shot switch to “Single” and press the red button shortly.
The red LED (on right panel of the control unit) lights shortly on triggering.
For starting continuous impulse operation switch to “Continuous”. You may select
faster or longer impulse rates by turning the turning knob. After a delay of several
seconds the first impulse (shot) will be released if “Continuous” was selected. The
impulse rate can be selected by the controller between about 4 and about 9 seconds.
Continuous shot operation is stopped by switching to “SINGLE”.