The analog inputs are electrically isolated by using photovoltaic
relays and a potential difference of 50V DC or 60V AC, at
maximum, is permissible between them. However, sensors
combined within one connector and sensors with an own power
supply are electrically connected to each other and must,
therefore, be operated in isolation. The voltage applied to the
measuring inputs must not /-5V (between B,C,D and A
or - respectively).
The cold junction compensation for thermocouple measurement is integrated
in socket M3 of the device.
As an option the system can be fitted with a measuring circuit board
ES5590G3 for the 10-fold sensor connector ZA-5590-MU. There are no addi-
tional channels here.
The measuring circuit boardcan trigger up to 8 passive selector switch boards,
each with 10 photovoltaic relays. However, the total number of meas. channels
is limited to 100 at max. To be able to adapt the number of sensors and
channels to the individual requirements, the number of channels of the meas.
circuit board and the selector switch boards can be independently configured to
10, 20, 30 or 40 (s.man. 6.10.13.1). The numbering of meas. points starts and
continues from the last meas. point of the master board. The selector switch
boards can be coded from 0 to 7 by the on-board code switches. The duration
of a meas. point scan proportionally increases to the number of meas.
channels. Analogue output cables can only be connected to the measuring
circuit board.
1. With the selector switch boards ES 5590-MF (9) for ALMEMO
®
flat
connector the number of measuring points is increased in steps of 10
electrically isolated ALMEMO
®
inputs. Limit value relay cables can be
connected to all boards. The plug-in module requires 2 PCB slots in the
housing.
2. The selector switch boards ES 5590-MU (10) also have 10 inputs, which
are guided to a 64-pole socket terminal strip. The connection of the
sensors is performed via a 10-fold plug ZA 5590-MU each having 4
screw-type terminals A, B, C and D, as each single ALMEMO
®
connector (see man. 4.1). Double sensors and sensors that require a
power supply or an ALMEMO
®
connector with logic control (e.g. humidity
sensors, rotating vanes etc.) cannot be connected. Independent from
the configuration of the channel number, 10 channels are only available.
The programming can be individually entered for each sensor, however,
it is stored in a common EEPROM that is located in the connector. Two
limit value relays, separately for Max and Min, are already mounted on
the board and can be connected via the MU connector. The plug-in
modul requires one PCB slot in the housing.
ALMEMO
®
5990-2
17
Connection of the Transducers
Summary of Contents for ALMEMO V5 5990-2
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