Electrical Connection - MR MESSKO COMPACT MT-ST160SK Manual Del Usuario

4 Electrical connections
4

Electrical connection

WARNING
Electrical Voltage! Potentially fatal electrcal pulses!
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 fold up the covering plate (Fig.
1/2). Remove the sheaths of the required connection lines to
a length of approx. 160 mm and then the insulation of the
required leads to a length of approx. 6 mm. Install the cable
glands with the connection lines at the device. Therefore see
the drawing in the appendix (Fig. 14). Take care that the seal-
ing ring of the cable gland squeezes the cable so that no liquid
can escape. Lose the individual leads in accordance with the
connection diagram (Fig. 3/4) printed on the covering plate on
the terminal strip (Fig. 3/1).
4.2 Sensor signal 4 to 20 mA (only for TT version)
The leads for the sensor are connected as described in 4.1 in
accordance with the connection diagram shown on the inside
of the covering plate (Fig. 3/4). The sensor has to be supplied
with a voltage of 12...30V. Therefor you can use an additional
power supply unit (24V/DC) or an indicator with an internal
power supply. The senosr is performed in 2-wire technique.
Take care on the right polarity!
CAUTION
A correction of the pointer using the adjustment screw
(Fig. 1/3) does not do the same adjustment to the ana-
logue output. For this reason, a deviation between the
readings of the pointer thermometer and a measuring
instrument connected to the analogue output can take
place.
Behind the label (Fig. 1/16) you'll find the two potentio–
meters designated ''ZERO'' (Fig. 1/10) and ''SPAN'' (Fig. 1/11)
with those the analogue outputs of the device are calibrated
and factory set. They are covered up by a label (Fig. 1/16).
Readjusting them results in the loss of guarantee.
16
CAUTION
Terminals for REMOTE INDICATION (4...20mA) must be
shortcircuited during insulation test.
The test voltage (max. 500VAC) must be raised gradually.
Fig. 3
Fig. 4
4.3 Checking and adjusting the microswitches (Fig. 4)
To set a microswitch, slide it by hand to the desired position.
CAUTION
Do not slide the microswitches on the colored indicator
points. The indicator points may break off or be bent.
BA 2038/02/07