BA-40100-02-V17 | 11
Operating instructions
4.5.1 Connection of the in- and outputs
NOTE
Terminal clips allocation depends on the software
configuration of TOPAX DX. Terminal clips allocation
depends on the delivered equipment.
The delivered equipment is listed in the protocol and terminal plan,
which are included with the device. Use this terminal plan to wire the
device and to put it in operation.
If the current software-configuration is not correct, the device has to be
newly configured before connecting in- and outputs (see Chapter “4.9
First set-up and programming guidelines” on page 14). The display
will show the new terminal diagram.
4.5.2 Connection of voltage supply
The device has no power switch and is immediately operative after hav-
ing applied the operating voltage. For this reason an external switch and/
or protective switch has to be installed.
For the connection to the power supply at the main board, refer to the
enclosed terminal plan (see section “4.7 Terminal clips of the main
board and the technical components” on page 12).
ATTENTION!
DO NOT let power be switched on via timer oper-
ation!
4.5.3 Internal fuse
For an additional external voltage supply protector, the value should not
be below 2 A (slow-blowing).
4.5.4 Connection of the sensor technology
Measuring cables may not be parallel when too close (less than 15 cm)
to power switches and/or cables for power installation. Separate cable
channels are to be used. Disturbing stray effects could otherwise falsify
the measurement. Power supply and measuring lines at close proximity
should only cross at a 90° angle.
The maximum permissible length of the measuring cables depends on
the kind of the sensor. When performing very ohmic measurements (e.g.
pH or Redox measurements) the following is to be considered:
• Connections and patch cords must be clean and dry.
• The permissible bending radius of the cable must be respected.
• The quality of the holding wires must correspond to the defaults
from the data sheet of the sensor.
IMPORTANT!
A continuous cable is to be used from the sensor to
the measuring entrance. An extension of the cable
by plugs or terminal sockets increases the risk of
disturbances due to contamination, humidity or ex-
cessive transition resistances.
4.5.5 Connecting the actuators
When connecting the actuators must be switched off to prevent uncon-
trolled starting and malfunctioning.
WARNING!
If devices e.g. dosing pumps with inductive loads with
a nominal current of 1 A and above are connected
to a relay, the contacts in the relay may be bonded.
Thus, the device will operate in an uncontrolled man-
ner. This may also result in an overdosing of chemicals. To prevent
the output relays from bonding if the load circuit shorts, they must
be protected separately on the maximum relay switching current.
For inductive loads, protective circuit must be applied to the relay
contacts (spark suppression). The manufacturer recommends
the use of the interference suppression module / spark suppres-
sion device (article 78614).
4.5.6 Replacing the battery
The life of the battery (Type VARTA, CR1/2 AA, 2 Volt, Lithium) provided
with the internal instrument clock is approx. 5 – 10 years. When the
batteries wears out a warning message will be displayed. The battery is
welded on the display circuit board in the front housing. It can only be
replaced by a person skilled in soldering.
Fig. 11: Battery for internal clock, on the display circuit board.
4.6 TOPAX on the EASYPRO water sampling station
If the TOPAX is set up on an EASYPRO water sampling station, it controls
the illumination of the LEDs. The LEDs of the sensors are controlled via
the measured values. The LEDs illuminate green when the measured
values lie within the set range. Leaving these ranges causes the LEDs
to illuminate red.
