PROTEM
®
D 404
23
Relay characteristics
Contact load:
8 A 250 V AC (cos phi = 1,0)
3 A 250 V AC (cos phi = 0,4)
5 A 30 V DC (0 ms)
Life : 10
7
switches (mechanical)
10
5
switches (electrical)
ATTENTION
When operating one relay contact with a
touching-dangerous potential, also the other contacts must
be handled like touching-dangerous!
Collective error relay
The collective error relay indicates each of the following
failures of the device by a potential free make contact:
1.
missing of power supply
2.
broken temperature sensor
3.
programmed switch point of the temperature sensor
(PT100) has been reached.
Time functions
For the outputs of relay 1-4 there are two time functions
(operate lag of release lag) available.
For each measuring input you can choose between the times
0 ... 255 seconds or 10 ... 2550 seconds separately.
Maximum tolerance of time range 1 :
1 second
Maximum tolerance of time range 2 :
10 seconds
Display
The device is equipped with a 5-digit 7 segment display.
LED indication
4 red LED´s indicate the relay status from relay 1 to relay 4.
1 yellow LED indicates a collective error or a missing line
voltage.
1 green LED indicates line voltage is OK.
Max. value memory
An EEPROM inside the device stores all maximum
temperatures.
RS232 Interface
With the help of an installed RS 232 interface and by using
a PC You ca interrogate terminal data from the device. The
data will be sent on request. See chapter 6 for the protocol
description.
Technical data of the interface:
Serial bus with TXD-, RXD- and GND-connection.
Transmission rate 9600 Baud, 8 Bit, Non-Parity and
1 Stop Bit (fix).
This function isn’t available during standby generating!
