Mounting The Device - MR MESSKO COMPACT MT-ST160SK Manual Del Usuario

3 Installation
2.2 MT-ST160W resp. MT-ST160WR
Pointer thermometers with adjustable microswitches are used
to indicate the winding temperature (thermal image). The
temperature rise between cooling liquid (oil)and winding
depends on the current in the winding. The secondary current
of the transducer is proportional to the current in the
winding. This transducer feeds a heating resistor inside the
mechanical thermometer. That causes an increasing indication
(gradient) of the measured oil temperature according to the
transformer load.
The pointer thermometer typ MT-ST160W (chapter 6.1) has to
be adjusted by setting the heating current, typ MT-ST160WR
(chapter 6.2) by setting the resistor of the heating loop.
2.3 TT version
This devices are additionally equipped with a sensor which
converts the temperature value into an electrical signal
(4 to 20 mA). The sensor requires power (12 to 30V DC).
3. Installation
CAUTION
The operating and installation conditions demanded by
this installation and operating instructions must be strictly
complied with.
3.1

Mounting the device

The pointer thermometer is attached to the transformer by its
mounting plate (Fig.1/13). The spacing between the fixing holes
is 140mm and the diameter of the holes is 9mm. The thermome-
ter should be installed vertically. The location of the device must
be chosen to avoid any irregular vibrations or electromagnetic
fields which are above the pertinent electromagnetic
compatibility standards.
3.2 Capillary tube (Fig. 1/14)
Roll out the capillary tube avoiding kinks and loops. Do not rip,
pull, squeeze or bend this tube. Never carry the thermometer by
the capillary tube. Route the capillary tube and fix it in position.
Roll up excess tube and store it in a position not subject to
excessive temperatures (max. 60°C). Minimum winding diameter
is 80 mm (see fig. 1).
3.3 Temperature sensor (Fig.1/15)
Fill the transformer thermometer pocket (according to DIN
42554 or similar) two thirds with oil or heat-conducting paste
and screw in the temperature sensor (Fig. 2/5) via the large
screwed gland (Fig. 2/4, wrench size 27mm). Turn the capillary
tube to the desired position and secure it with the small screwed
gland (Fig. 2/3, wrench size 14mm).
BA 2038/02/07
3.4 Kick protection (Fig.2/1) optional
If required, fit the kick protection on the screw (Fig. 2/4)
and route the capillary tube inside the kick protection.
Tighten the fixing screw (Fig. 2/2, wrench size 13mm) of
the kick protection on a flat part of the hex nut.
3.5 Maximum pointer (Fig.1/9)
The maximum pointer is operated by the pointer and records
the maximum reading of a temperature measurement. The
maximum pointer can be reset using the knob (Fig. 1/12).
Fig. 1
Fig. 2
15