SICK HC8X, Technical Information

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Chapter 1 Technical Information
HC8X Heat Control
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Product Description
1
Product Description
The HC8X is an 8-channel heat control. It serves to regulate single and multi-phase heating
circuits.
The control unit is an extension of the modular MODIOS I/O system and is installed in an
existing I/O module box system.
1.1 Method of Operation of the Control Unit
The HC8X controls the temperatures of up to eight heating circuits in a two-point procedure.
When the control circuits are configured and parameters set accordingly, the actuators of
the heating circuits can be operated in a multi-phase follower mode. All control circuits can
be enabled and disabled independently. The communication to a parent PC measuring sys-
tem is performed via two bidirectional plastic optical fibers in master/slave procedure (for
the control process of the HC8X see Chapter 5.4 Control Process, page 5-34).
1.2 Control Unit Design
The control unit consists of a microprocessor-controlled regulator part with LED indication
and power section for heating circuits with a 3680 VA maximum nominal rating per heating
circuit.
Fig. 1-1: HC8X Overview
X10
X1 X9 X2 X3 X4 X5 X6 X7 X8
1.2.1 Special Control Unit Configuration
In the full version, the HC8X heat control is equipped with eight power outputs. When only
some of the control unit outputs are used, the respective terminal blocks of the power out-
puts are blank and the drillings of the thermal overcurrent trips are closed with plastic caps.
Note The HC8X can be retrofitted by the installation of the retrofit kits HC 4A, 8A, 16A with / with-
out load relay (see Chapter 7.1 Retrofitting the HC8X, page 7-36).
Possible Heating Modes
The HC8X can be operated in three heating modes (see Chapter 5.4 Control Process,
page 5-34):

Heating mode "H1" = standard control.
If the temperature to be controlled exceeds the set tempe limit, a safety relay
which is connected in series with the working relay interrupts the supply voltage of the
heating circuit. When the set temperature hysteresis is reached, the safety relay
closes and the working relay takes over the control switching function.