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Functions
5.2 Extended functions
3KC ATC6300 transfer control device
Manual, 03/2018, L1V30535632002A-01
57
5.2
Extended functions
5.2.1
Remote variables REMx
The ATC6300 can control a maximum of 8 remote variables.
Fundamentally, a remote variable is a variable used internally that can be switched on and
off by the user.
It is switched on and off via MODBUS (see chapter Commands (Use with MODBUS function
Note
Expansion modules required
The remote variables can only be used in combination with the expansion modules for
communication, 3KC9000-8TL74 (RS485) and 3KC9000-8TL75 (Ethernet) and with the USB
front interface (3KC9000-8TL73).
The remote variables can be used as a source for the following functions:
●
User alarm UA
●
Counters
●
Digital output
Example: If a digital output is set as a source for the remote variable, it can be switched on
and off by remote access via MODBUS.
5.2.2
User limit LIMx
The ATC6300 provides the option of specifying four user limits.
The LIMx limits are internal variables whose status is dependent on whether one of the
measurements performed by the system has exceeded the limit specified by the user
(example: voltage between L1-L2 higher than 400 V).
Note
Limit settings
The user limits have no influence on the automatic switchover between the lines.
They can, for example, be used for analyses of the power supply quality.
For each LIMx limit both the reference measurement and the reference source must be set.
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