MESSKO MTeC EPT202, Operating Instructions Manual

Page: 13 / 51

12 BA 2076/02/01
4 Electrical connection
RS485 RS485 RS485 RS485 RS485
Data line A: Terminal 19 (2)
Data line B: Terminal 20 (1)
Ground connection: Terminal 18 (3)
Shield:
Terminal 17 (4)
The RS 485 interface can be used to set up
a subsystem as shown in Fig. 4 with a
maximum of 32 devices.
The RS 485 interface uses a separate
company protocol. The description and
additional protocols are available on
request.
RS485
G
N
D
A
(+
)
B
(-
)
20 19 18 17
Switching contacts ALARM and TRIP Switching contacts ALARM and TRIP
Switching contacts ALARM and TRIP Switching contacts ALARM and TRIP
Switching contacts ALARM and TRIP
These two switching contacts can be used
to generate an alarm message or trip the
transformer.
Connect the two relay contacts as required
for the application.
Error
42 43
Alarm
38 37 36
ERROR contact ERROR contact ERROR contact ERROR contact ERROR contact
The ERROR contact is switched by the
internal self-monitoring function of the
device. (See chap. 5.4.)
When the device is in operation and there
is no device error, the contact is open
between terminals 42 (21)and 43 (22).
When there is a device error, the contact is
closed (fail-safe programming).
This contact can be used to generate an error message for
remote transmission. For a description of the self-monitoring
function of the device, see chapter 5.4.
4.6 4.6 4.6 4.6 4.6 Switching Contacts Switching Contacts Switching Contacts Switching Contacts Switching Contacts
Switching contacts S1 to S4 Switching contacts S1 to S4
Switching contacts S1 to S4 Switching contacts S1 to S4 Switching contacts S1 to S4
The switching contacts S1 to S4 can be
used to switch on or off the individual
cooling stages of a transformer based on
the temperature.
Connect the lines of the fans/pumps to the
relay contacts for this.
S1
26 25 24
Parallel to the contacts, the EPT202 switches the cooling-
phase-specific winding parameters (for more details, see
chapter 5). This must be considered when connecting the
relays.
Fig. 5
GND A B
17 18 19 20
EPT202
RS485 address 2
120 Ohm
EPT202
RS485 address 32
17 18 19 20
GND A B
Konverter
RS485 / RS232
Schnittstellen
24VDC
RS232
RS485
RS485
120 Ohm
GND A B
17 18 19 20
EPT202
RS485 address 1
Interface converter
RS485 / RS232