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Idiomas disponibles
Idiomas disponibles
3 Installation
4 Electrical connection
2.2 MT-STW160F2
These types of pointer thermometers with adjustable micros-
witches are used to indicate the winding temperature (thermal
image). The temperature difference between the cooling
medium (oil) and the winding depends, among other things,
on the current flowing in the winding. The CT secondary
current is proportional to the winding of the transformer. The
CT secondary current feeds a heating resistor inside the ad-
ditional device ZT-F2.1. This provides an appropriate increase
(heat gradient) to the actual indication of the measured oil
temperature, corresponding to transformer load. For further
details please refer to the operating instructions BA2526030
for the ZT-F2.1.
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.1/11). The spacing between the fixing holes
is 140mm and the diameter of the holes is 9mm. The thermom-
eter should be installed vertically. The location of the device
must be chosen to avoid any irregular vibrations or electro-
magnetic fields which are above the pertinent electromagnetic
compatibility standards.
3.2
Capillary tube (Fig. 1/12)
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 posi-
tion. 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.1/13)
Fill the transformer thermometer pocket (e.g. acc. to EN50216-4,
formerly DIN 42554 or similar) up to two thirds full with oil or
heat conducting paste and screw the thermowell as shown in
Fig. 2/2 into place. Insert the temperature sensor and capillary
tube into the thermowell as far as possible and tighten it up
using the M16 cable gland. If the thermometer is to be used
with either a combi well or a transformer transmitter type
ZT-F2.1 , please refer to the operating instructions BA2032 or
BA2526030 respectively.
10
3.4
Kick protection (Fig.2/1) optional
If required, fit the kick protection to the adapter of the
thermowell (Fig. 2/2) and route the capillary tube inside the
kick protection. Tighten the fixing screw (Fig. 2/4, wrench size
13mm) of the kick protection to a flat side of the thermowell
adapter.
Fig. 1
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. 1/10).
4
Electrical connection
WARNING
Electrical voltages, danger to life!
All connecting wiring must be free of voltage before
opening the device.
The bayonet fixing ring must be removed in order to connect,
set and check the microswitches. Turn the ring anti-clockwise
as far as possible and then lift it off.
When closing the device, make sure that the maximum
pointer (Fig. 1/9) is in the correct position. It must be to the
right of the pointer (Fig. 1/4). Replace the ring and turn it
clockwise as far as it will go.
4.1 Connecting the microswitches (Fig. 3)
To connect the microswitches flip up the covering plate (Fig.
1/2). Remove the outer sheaths of the connecting cables to
a length of approx. 160 mm and then the insulation of the
individual conductors to a length of approx. 6 mm. Install
BA2046/03/07
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