ELTEX Terrabox TCB030 User manual

Operating Instructions
Terrabox TCB030
Terracompact II TCO030
for TUE30 Terra-Control Ground Monitoring System
BA-en-4003-2005
F00034y

2BA-en-4003-2005_TUE30

BA-en-4003-2005_TUE30 3
List of contents
1 TUE30 Terra-Control Ground Monitoring System
Overview of Appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
1.1 Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 Variants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.1 Identification of risks and hazards . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.2 Technical advance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.3 Proper use . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
2.4 Work and operational safety . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.5 Special arrangements according to the declaration of conformity . 11
3 Assembly and installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 Terrabox TCB030 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.1 View of appliance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1.2 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1.3 Electrical connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2 Terracompact II TCO030 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2.1 Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2.2 Electrical connections. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.2.3 Power supply TCON01. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.3 Supply voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3.4 Cable specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
4 Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.1 Start-up . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.2 Function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25
4.3 Operation with 2 ground contactors, Big-Bag grounding . . . . . . . . 26
4.3.1 Before connecting the two ground contactors, the BIG-BAG
has no connection to ground potential . . . . . . . . . . . . . . . . . . . . . . 26
4.3.2 Before connecting the two ground contactors, the BIG-BAG
is already connected to ground potential . . . . . . . . . . . . . . . . . . . . 26
4.4 Switching states of the relays in overview
(Contact circuit indicator signal) . . . . . . . . . . . . . . . . . . . . . . . . . . 27
4.5 Function control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
5 Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.1 Ground control units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28
5.2 Ground clamps . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
5.3 Cable rewinders . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29
6 Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
7 Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

4BA-en-4003-2005_TUE30
8 Technical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.1 Terrabox TCB030 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .31
8.2 Terracompact II TCO030 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .33
8.3 Power supply TCON01 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .34
9 Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .35
10 Accessories and spare parts . . . . . . . . . . . . . . . . . . . . . . . . . . .37
A. Annex . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .39
A.1 Grounding with ground monitoring unit (active grounding) . . . . . .39
A.2 Grounding without ground monitoring unit (passive grounding) . . .40
A.3 Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .41
Declarations of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42

BA-en-4003-2005_TUE30 5
Dear customer,
The controlled grounding principle used in the TUE Terra-Control Ground
Monitoring System ensures that static charges developing in potentially
explosive atmospheres, e.g. during loading, discharging or refilling are
safely avoided. This means that the risk of ignition caused by uncontrolled
static discharges is eliminated at source.
No impedance grounding and no large conductor diameters, normally
needed in electrical machine construction, are required.
Static charges are caused by the contact and separation of material
surfaces, e.g. when pumping liquid or powdery materials from one
container to another. If no leakage device is available to lead these
charges to ground, extremely high charge potentials may develop.
Deflagrations or even explosions caused by sparking can result in
substantial damage or personal injury.
Objects are considered to be adequately grounded if their ground leakage
resistance is not greater than 105…108. The Eltex Terra-Control Ground
Monitoring System guarantees a safe and reliable ground connection.
Used in combination with the Eltex ground clamps and the cable rewinders
the system provides the ultimate ground connection.
The Terra-Control components monitor the connection to the bonding
conductor and the contact across the ground clamps. This function is
controlled by a relay. This relay allows an isolation mechanism to be
implemented which, as long as the ground clamp is connected to the
container or bin, releases the filling or refilling process, for instance. If the
clamp is removed or slips off, or if the ground connection is interrupted,
filling stops automatically.
Please read these instructions carefully before starting the unit. This will
help you prevent personal injuries and damage to property.
Simply give us a call if you have any suggestions, proposals or ideas for
improvements. We greatly appreciate the feedback from the users of our
appliances.

6BA-en-4003-2005_TUE30
1. TUE30 Terra-Control Ground Monitoring System
Overview of Appliance
1 TERRACOMPACT II TCO030
2 Cable rewinder, aluminum, 601KR/AW and 601KR/DW
with ground clamp (zone 1/21)
3 Cable rewinder, plastic, 601KR/KW with ground clamp (zone 1/21)
4 Ground clamp (zone 1/21)
5 Ground cable KG/BNA (zone 1/21)
6 Helix ground cable KG/BSA (zone 1/21)
7 TERRABOX TCB030 (zone 1/21)
Z00206y
Fig. 1:
Overview
TUE30 Terra-ControlGround Monitoring System
Explosion hazard area (zone 1/2) safe area
2
3
4
Terrabox
5
Terracompact II
1 2 34 5 6
– +
N.O. COM N.C.
24V DC ±10%
78 9 10 11 12
PAL
input Ex i
PAL ZG2 Z2 ZG1
Z1
1
6
7

BA-en-4003-2005_TUE30 7
1.1 Components
Terrabox TCB030
for installation in explosion hazard areas;
operating voltage 24 V DC or 115/230 V AC depending on design;
for connecting a clamp (two clamps for BIG-BAG grounding).
Terracompact II TCO030
for mounting on a standard rail NS35 in dry control rooms;
operating voltage 24 V DC;
for connecting a clamp (two clamps for BIG-BAG grounding).
Power supply TCON01
100…240 V AC, for supplying a maximum of 2 Terracompact II TCO030.
601KR/AW, 601KR/DW, 601KR/KW cable rewinder,
Series 70 ground clamps
see separate Operating Instructions BA-en-4007
Ground clamps TERRACLAMP
see separate Operating Instructions BA-en-4014
1.2 Variants
Terrabox TCB030:
Standard (1 ground contactor)
• TCB030/S0 24 V DC
TCB030/S1 115 V AC
TCB030/S2 230 V AC
Operating points: ON <20 kOhm, OFF >50 kOhm / ±20 %
BIG-BAG (1 ground contactor):
• TCB030/B0 24 V DC
TCB030/B1 115 V AC
TCB030/B2 230 V AC
Operting points: ON <50 MOhm, OFF >100 MOhm / ±20 %
BIG-BAG (2 ground contactor):
• TCB030/20 24 V DC
TCB030/21 115 V AC
TCB030/22 230 V AC
Operating points: ON <50 MOhm, OFF >100 MOhm / ±20 %
Terracompact II TCO030:
Standard: TCO030S
BIG-BAG: TCO030B
Power Supply TCON01 for Terracompact II TCO030

8BA-en-4003-2005_TUE30
2. Safety
The units have been designed, built and tested using state-of-the-art engi-
neering, and have left the factory in a technically and operationally safe
condition. If used improperly, the units may nevertheless be hazardous to
personnel and may cause injury or damage. Read the operating instruc-
tions carefully and observe the safety instructions.
2.1 Identification of risks and hazards
Possible risks and hazards resulting from the use of the units are referred
to in these operating instructions by the following symbols:
Warning!
This symbol appearing in the operating instructions refers to operations
which, if carried out improperly, may result in serious personal injuries.
Caution!
This symbol appearing in the operating instructions refers to operations
which, if carried out improperly, may result in damage to property.
Ex Warning!
Only for units with Ex approval.
This symbol denotes the special conditions which must be observed when
operating the units in explosion hazard areas as specified in the
approvals.
2.2 Technical advance
The manufacturer reserves the right to make changes to the technical
specifications without prior notice in order to adapt the units to state-of-
the-art engineering. Eltex will provide the latest information on any
changes or modifications in the operating instructions on request.
2.3 Proper use
The TUE Terra-Control Ground Monitoring System must be operated only
for the purpose of static ground connection.
The active component Terracompact II TCO030 is an associated electrical
device in accordance to the standards EN 60079-0 and EN 60079-11 and
must be placed outside the explosion hazard area. The Terrabox TCB030
component is approved for installation in the explosion hazard area (see
chapter 8 Technical specifications).
The Terra-Control ground monitoring systems are designed for operation
with specific Eltex contact clamps of the Series 70 and TERRACLAMP as
well as 601KR/_ cable rewinders. These contact clamps provide high
degree of safety and the best possible ground connection in terms of static
electricity.
Ex!

BA-en-4003-2005_TUE30 9
The manufacturers will not assume any liability and warranty if the units
are used improperly or used outside the intended purpose.
Modifications or changes made to the devices are not permitted.
Use only original Eltex spare parts and equipment.
2.4 Work and operational safety
Warning!
Carefully observe the following notes and the complete chapter 2 "Safety”,
page 8!
• The local standards, rules and regulations relating to the installation
and operation of electrical appliances in potentially explosive atmo-
spheres must be observed (e.g. EN 60079-14 and EN 60079-17 in the
EU and ElexV in Germany).
• Appliances designed for use in potentially explosive atmospheres must
not be modified. The technical specifications for ambient conditions and
operation must be maintained and observed (see chapter 8 "Technical
specifications”, page 31).
• Any work involving the units must be carried out by qualified electri-
cians (see chapter 3 "Assembly and installation”, page 12, chapter 5
"Maintenance”, page 28, chapter 7 "Troubleshooting”, page 31).
• The unit may only be used by qualified personnel trained for explosion
hazard areas.
• A "Connect/Disconnect Approval“ by the plant operator must be
obtained before carrying out any installation, assembly, service, repair
or maintenance work in potentially explosive atmospheres. Make sure
that there is no potentially explosive atmosphere prevailing in the wor-
king area (see chapter 3 "Assembly and installation”, page 12, chapter
5 "Maintenance”, page 28).
• Electrical systems used in explosion hazard areas must at all times be
in a technically faultless condition. Any defects must be repaired or
remedied immediately (see chapter 4 "Operation”, page 25).
• The point of installation of the TCB030 Terrabox must be dry and the
indicator lamp must remain in full view. Avoid direct exposure to sun-
light (see chapter 3.1.2 "Assembly”, page 13).
• The unit must be connected to the equipotential bond via the external
ground terminal (7, Fig. 4 / Fig. 5). In addition, the ground terminal
inside the enclosure must be connected to a PE conductor or a bonding
conductor (see chapter 3.1.2 "Assembly”, page 13).
• Intrinsically safe circuits must be routed separately from non-intrinsi-
cally safe circuits (separate cable conduits/ducts). Crossing intrinsically
safe and non-intrinsically safe leads is not permitted. An equipotential
bonding connection (PA) must be established along the entire intrinsi-

10 BA-en-4003-2005_TUE30
cally safe measuring circuit (see chapter 3.1.3 "Electrical connections”,
page 13, chapter 3.2.2 "Electrical connections”, page 19).
• The maximum cable length in the intrinsically safe circuit must not
exceed the maximum rated capacity and inductance (see Technical
Specifications), see chapter 3.1.3 "Electrical connections”, page 13,
chapter 3.2.2 "Electrical connections”, page 19).
• A potential equalization system (PA) has to be set up along the com-
plete measuring circuit (see chapter 3.1.2 "Assembly”, page 13).
• The Terracompact II TCO030 must be mounted outside the hazardous
area. Only the intrinsically safe circuit is allowed to lead into the hazar-
dous area (see chapter 3.2.1 "Assembly”, page 19).
• If a TCO30 or TCB030 is supplied wiht 24 V, make sure that the supply
(24 V) is ungrounded. If required, the negative connection can be con-
nected with PAL (see chapter 3.3 "Supply voltage”, page 24).
• If the ground cable is subjected to tensile stress in the application (e.g.
if KG/BN_ (ground cable) or KG/BS_(helix ground cable) is used), the
cable must be secured additionally with an external strain relief (e.g. a
strap clip), see chapter 3.4 "Cable specification”, page 24.
• Please note the type plate indicating the connection data (supply vol-
tage) of the units (see chapter 4 "Operation”, page 25).
• During operation with 2 ground contactors, it is not only the ground link
of the BIG-BAG which is being monitored, but also the conductivity of
the BIG-BAG. Note that both ground contactors are connected to two
different grounding points of the BIG-BAG (see chapter 4.3 "Operation
with 2 ground contactors, BIG-BAGgrounding”, page 26).
• Cables and clamps must not be damaged. Damaged cables and
clamps must be replaced with new parts (see chapter 5 "Maintenance”,
page 28).
• Check the units at regular intervals for proper function, in doing so
check the operating points and the earthing resistance (see chapter 5.1
"Ground control units”, page 28).
• To make sure that the proper ground connection exists with the equipo-
tential bonding and that no malfunctions occur in active clamps, the
ground clamp must be cleaned when dirty (see chapter 5.2 "Ground
clamps”, page 29).
• Store the ground clamp such that it cannot be damaged. Replace
damaged cables and clamps with new parts. Whenever possible, the
ground clamp should either be hung up freely or be clamped to a non-
conductive object (see chapter 5.2 "Ground clamps”, page 29).
• Perform regular checks to ensure that the cable and the insulation
show no tears or abrasion that could impair the cable's insulation or
functioning (see chapter 5.3 "Cable rewinders”, page 29).

BA-en-4003-2005_TUE30 11
2.5 Special arrangements according to the declaration of
conformity
• A potential equalization system (PA) has to be set up along the com-
plete measuring circuit.
• In areas in which dust is likely to cause explosive atmospheres, only
appropriately certified equipment marked "D" may be connected to the
measuring circuit.
• In areas in which gas is likely to cause explosive atmospheres, simple
electrical apparatus like clamps and cable rewinders may be connected
to the measuring circuit. The simple apparatus must comply with the
appropriate requirements of EN 60079-11, but must not be certified and
marked.
• The intrinsically safe measuring circuit may also be guided into the
explosion hazard zone in which Class 1 operational equipment is
required. In this zone, sparks generated under field conditions by the
use of connected equipment (e.g. measuring clamp) are not permitted.
Ex!

12 BA-en-4003-2005_TUE30
3. Assembly and installation
3.1 Terrabox TCB030
3.1.1 View of appliance
1 Cable screw connection with kink guard (Ex), (2x for BIG-BAG grounding)
2 Cable inlet
3 Blanking plug
4 Ground terminal
5 Cable inlet (3x)
6 Indicator lamp, dual color (green/red)
7 Mounting bracket (4x)
8 Type plate
Fig. 2:
Terrabox TCB030
Z00031y
1 2 3 4 5 6 7 8

BA-en-4003-2005_TUE30 13
3.1.2 Assembly
When installing the system in explosion hazard areas, every precaution
must be taken to ensure that no explosive atmosphere exists in the
working area!
The Terrabox TCB030 is approved for assembly and installation in
potentially explosive atmospheres. The system is designed for wall
mounting and is attached with the mounting brackets provided.
The point of installation must be dry and the indicator lamp must remain in
full view. Avoid direct exposure to sunlight.
3.1.3 Electrical connections
When installing the system in explosion hazard areas, every precaution
must be taken to ensure that no explosive atmosphere exists in the
working area!
The unit must always be connected to the equipotential bond via the
external ground terminal (7, Fig. 4 / Fig. 5). In addition, the ground
terminal inside the enclosure must be connected to a PE conductor or a
bonding conductor.
The connection space of the unit is accessible after opening the cover of
the enclosure. The terminals for the clamps are located on the left. These
Ex!
Fig. 3:
Mounting dimen-
sions Terrabox
z00032y
Terrabox
231
217
211
174
>100
Ex!

14 BA-en-4003-2005_TUE30
circuits are intrinsically safe. The non-intrinsically safe terminals for the
supply voltage and the signal contacts are located on the right (see
Fig. 4 / Fig. 5).
The connecting leads inside the connection space must be routed such
that intrinsically safe and non-intrinsically safe leads do not make contact
even if a wire should come loose. Use cable ties, if necessary.
The cable screw connections are designed for external cable diameters of
6…12 mm.
The connecting lead of the clamp is routed in via the cable screw
connection with kink guard (1, Fig. 4 / Fig. 5). Appliances for BIG-BAG
grounding have two contactors, and the second lead is routed in via an
additional cable screw connection with kink guard (3, Fig. 5).
A two-core cable for connecting the ground circuit with the PAL bonding
lead is routed into the connecting terminal space via the cable inlet
(2, Fig. 4 / Fig. 5). The double routing ensures that any disruptions to the
PAL bonding lead are identified.
Note:
The two PAL leads belong to the intrinsically safe circuit, see cable entry
2, Fig. 4 / Fig. 5. The terminals of the Terrabox TCB030 are also marked
as intrinsically safe terminals (blue).
This is NO protective ground link, the leads must NOT be coloured green/
yellow. The PAL connection can be made with a two-wire sheathed cable,
with no wire colours prescribed, i.e., all colours apart from green/yellow
are permitted.
The sheathed cable can be made in light blue. As the connecting
terminals are already marked in blue, there is no absolute necessity for
this.
A potential equalization system (PA) has to be set up along the complete
measuring circuit.
The signal leads are routed via the cable inlets (4 and 5, Fig. 4 / Fig. 5),
the supply voltage lead is routed in via the cable inlet (6, Fig. 4 / Fig. 5).
The maximum cable length in the intrinsically safe circuit must not exceed
the maximum rated capacity and inductance (see Technical
Specifications).
The device must always be connected to an equipotential bond.
In the ex factory state, the lead-ins (2, 4 and 5, Fig. 4 / Fig. 5) are sealed.
Lead-ins not used must be blanked off.
Close the enclosure after completing the connections, making sure that
the seals are seated properly. Do not damage the seals.
Ex!
Ex!
Ex!

BA-en-4003-2005_TUE30 15
Terrabox TCB030 connection example:
Cable rewinder 601KR/_ with clamp 70AG/70BG
1 Ground clamp supply lead
2 PAL connection (2 x 1,5mm2)
3 Blanking plug
4, 5 Signal contacts
6 Supply voltage lead
7 Ground terminal
8 Equipotential lead
9 Supply voltage 24 VDC or 115/230 VAC, see type plate
10 Contact position diagram: no enabling, indicator lamp red
core colors: a: blue b: brown c: green/yellow
Fig. 4:
Connection
example:
active grounding
with
clamp 70AG/BG
via cable rewinder
601KR/_
z00033y
PA L PA L NC NC NO
NO COM
COM
N (L-)
L1 (L+ )
Ex i a
12
45 6
7
cb
a
601KR_
ZG1
Z1
ZG2 Z2 –
+
8
3
10
9
1
1
1
2
2
2
a
b
PE

16 BA-en-4003-2005_TUE30
Terrabox TCB030 connection example:
BIG-BAG grounding with two clamps 70HK
1 Ground clamp 2 supply lead
2 PAL connection (2 x 1,5mm2)
3 Ground clamp 1 supply lead
4, 5 Signal contacts
6 Supply voltage lead
7 Ground terminal
8 Equipotential lead
9 Supply voltage 24 VDC or 115/230 VAC, see type plate
10 Contact position diagram: no enabling, indicator lamp red
core colors: a: blue b: brown c:green/yellow
Fig. 5:
Connection
example:
BIG-BAG
grounding with two
clamps 70HK
(without cable
rewinder)
z00035y
PA L PA L NC NC NO
NO COM
COM
N (L-)
L1 (L+ )
Ex i a
1
245 6
7
a
3
70HK 70HK
ZG1
Z1
ZG2 Z2 –
+
8
9
10
1
1
1
2
2
2
c
ca
ab
PE
bb

BA-en-4003-2005_TUE30 17
Terrabox TCB030 terminal assignment
Intrinsically safe terminal block (measurement circuit)
Terminal Connection - ground contact
PAL
PAL
ZG2
Z2
Z1
ZG1
Equipotential bond
Equipotential bond
Clamp casing 2 (not assigned if 1 clamp only)
Clamp contact 2
Clamp contact 1
Clamp casing 1
Non-intrinsically safe terminal block (contact circuit indicator
signal)
Terminal Connection - relay contact
NC relay 2
COM relay 2
NO relay 2
NC relay 1
COM relay 1
NO relay 1
Break contact 2
Middle contact 2
Make contact 2
Break contact 1
Middle contact 1
Make contact 1
Connection - 24 V DC supply
+
–
+ 24 V DC
0 V DC
Connection - 230 V AC supply
1
N
230 V AC
0 V AC
Connection - 115 V AC supply
1
N
115 V AC
0 V AC

18 BA-en-4003-2005_TUE30
Connection to the cable rewinder
Connecting diagrams of the clamps
Wire color: a blue b brown c green/yellow
Fig. 6:
Connection of the
cable rewinder
601KR/_
z00034y
PAL
a
bc
bac
Fig. 7:
Connecting dia-
grams of the
clamps type 70AG,
70AK, 70BG and
70HK
z00036y
100 k
a
b
c
100 k
100 k
70AG / 70AK
100 k
a
b
c
100 k
70BG
a
b
c
70HK

BA-en-4003-2005_TUE30 19
3.2 Terracompact II TCO030
3.2.1 Assembly
The Terracompact II TCO030 must be mounted outside the hazardous
area. Only the intrinsically safe circuit is allowed to lead into the
hazardous area.
The Terracompact II TCO030 is intended for assembly on a standard rail
NS35. Several appliances may be plugged next to each other. Each
Terracompact II unit is laid out for connection to a ground contact maker.
The unit is preferably installed in the switchgear cabinet of a dry control
room.
One power supply TCON01 (see spare parts) may be used to supply two
Terracompact II with an operating voltage of 24 V DC.
3.2.2 Electrical connections
Warning!
The signal contact supply lead and the operating voltage supply leads
must not be allowed to cross the intrinsically safe circuits (blue leads).
Separate cable conduits must be provided for intrinsically safe circuits.
The maximum cable length in the intrinsically safe circuit must not exceed
the maximum rated capacity and inductance (see Technical
Specifications). A potential equalization system (PA) has to be set up
along the complete measuring circuit. The device must always be
connected to an equipotential bond.
Connect the intrinsically safe circuit, i.e. the ground contact makers or the
cable rewinder, to terminals 9, 10, 11 and 12.
Ex!
Ex!
Fig. 8:
Terracompact II
TCO030 with ter-
minal assignment
Z00148y
Terracompact II
1 2 34 5 6
–+
N.O. COM N.C.
45
68
24V DC ±10%
78 9 10 11 12
PAL
input Ex i
PAL ZG2 Z2 ZG1Z1
116

20 BA-en-4003-2005_TUE30
Connect the non-intrinsically safe circuits to terminals 1, 2, 3, 4, 5 and 6.
The terminal assignment is shown in the following table.
The double equipotential lead PAL (Fig. 9, terminals 7 and 8) guarantees
that disruptions of the PAL connection are identified.
Note:
The two PAL leads belong to the intrinsically safe circuit, see connection 7
and 8, Fig. 9. The terminals of the Terrabox TCB030 are also marked as
intrinsically safe terminals (blue).
This is NO protective ground link, the leads must NOT be coloured green/
yellow. The PAL connection can be made with a two-wire sheathed cable,
with no wire colours prescribed, i.e., all colours apart from green/yellow
are permitted.
The sheathed cable can be made in light blue. As the connecting
terminals are already marked in blue, there is no absolute necessity for
this.