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Equipment characteristics
Application
VCS control units are compact control and power distribu-
tors used for the decentralized regulation and control of air-
handling systems. ey provide the equipment with high
stability and safety while allowing easy control, including the
viewing of operating states. (STOP - OPERATION - AUTO).
Main Features
e VCS control unit is intended for the following:
n Complex autonomous control of air-handling systems
n Supply or room air temperature control (cascade control)
n Supply and power actuation of air-handling systems
n Protection and safeguarding of connected components
is control unit provides air-handling systems with control
and safety functions. It can be equipped with the necessary
number of proportional inputs and outputs depending on the
required functions.
Sophisticated control algorithms ensure system stabil-
ity, user-friendly control and energy savings. Another
advantage is that the control unit's features also contrib-
ute to energy savings in air-handling system operation:
n Option to set the unit to 2 temperature modes
• Comfort
• Economy
n Time schedule setting options
(daily or weekly time schedules)
n Additional operating mode setting options:
• Optimized start
• Temperature start-up
• Night chilling
n Precise drive control using data communications
(Modbus RTU protocol)
n Superior antifreeze protection with moderate heating of
the heat exchanger during standby mode
n Precise analogue control of controlled peripheral units
(according to the controlled component)
Unit Design
ese control units are designed in accordance with ČSN
EN 60204-1. e unit's control and power parts are situ-
ated in a single box. e components, control and actuating
elements, are fi tted on the DIN bars inside the control unit.
Depending on the version, the VCS control unit can be provided
in plastic (plastic switchboard) or in sheet-steel (sheet-steel
switchboard). Both designs are equipped with transparent
doors. e controls are situated below these doors. Further,
the VCS control unit can be produced as a built-in assembly
and a part of an air-handling unit section, which must be
designed for that purpose and meet specifi c requirements.
Controller HW and SW Concept
e core of the VCS system is created by a powerful Siemens
Climatix series PLC controller. e control unit can be equipped
with one of two POL4xx and POL6xx controller versions
depending on the components used in the air-handling unit.
Simultaneously, additional external input/output or commu-
nication modules can be connected to the POL6xx controller.
Figure 1 – VCS control unit design
Control unit box
Screws
Circuit breakers
Disconnecter
Master switch
HMI-SG controller
For local control, the HMI-SG POL822/60 hand controller
can be used. e control unit allows up to 8 basic control
sequences to be used depending on the air-handling unit
confi guration. e order of some sequences can be changed
(e.g. heating-mixing damper or cooling-fan cooling).
e heat pump or electric a er-heater can be separated from
basic sequences in the so-called extra sequences.
If this is the case, another sensor must be used in the air inlet,
and a special set-point must be set for this type of control.
is feature can only be used a er prior consultation with the
manufacturer. ese units are delivered adapted to individual
applications so they will provide exactly those features needed
for the operation of a specifi c air-handling device.
Control
Local control
e basic VCS controllers are devices (manual controllers
with bus connection) for so-called local control of the control
unit (see fi g. 2):
a) Room controller - HMI-SG (POL822/60)
b) Comfortable universal alphanumeric driver
- HMI-DM nebo HMI-TM
Note: For details, see controllers instructions part of the
manual.
Distant control
In addition to local VCS controllers, so-called remote control
can be used. For this control, you need to connect VCS to LAN,
WAN or Internet (For production, the control unit must be
confi gured/ordered with the required functionality).
a) HMI@WEB - You can use the HMI @ WEB controller via
the web interface. e controller fully complies with the local
HMI-DM and TM controls.
b) Mobile app (see fig. 3) - You can use simple touch
application for smartphones or tablets with Google Android
(v. 4.0.3 and higher).
c) SCADA web interface
Monitoring and operation using the device’s technological
scheme with operating parameters, respectively using the
tabular interface of an internet browser on a PC. For details,
refer to page 58.
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