6.0 Operation
6.0
Operation
6.1
Operating Cycle
This product is fitted with an instrument switch which cuts off power to the control
circuit.
Connect the product to the electrical supply.
There is also a heater switch which can be used to disconnect power to the elements.
Operate the instrument switch to activate the temperature controller. The controller
becomes illuminated and goes through a short test cycle.
Over-Temperature option only
. If the digital over-temperature option has not yet
been set as required, set and activate it according to the over-temperature controller
instructions.
The product will heat up according to the controller setpoint or program, unless a time
switch is fitted and switched off.
As the product heats up, the heat light glows steadily at first and then flashes as the
product approaches the desired temperature. For more information on temperature
control see the controller instructions.
Over-Temperature option only.
If the over-temperature circuit has tripped, an
indicator on the over-temperature controller flashes and the heating elements are
isolated. Find and correct the cause before resetting the over-temperature controller
according to the instructions supplied.
To switch off power to the heating elements, use the heater switch. To switch the
product off, use both the heater switch and the instrument switch. If the product is to be
left switched off and unattended, isolate it from the electrical supply.
6.2
Control Method
Set the three temperature controllers to the desired setpoints. The setting and
operation of the end zone controllers depends on the 3-zone control options selected
when the product was ordered. These options are described in the 3-zone control
methods section.
6.3
3-Zone Control Methods
There are two different control options (B & C).
(B) Retransmission of Setpoint using Broadcast Communications.
(C) Independent control
The models listed in this manual are designed to achieve an extended uniform
temperature zone with the use of three control zones rather than achieving different
temperatures in each zone.
For method B, the control zones are linked so that they all follow the centre zone
controller in a master-slave approach
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