Eurotherm 3204i, Руководство пользователя

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Part number HA029005. Issue 2.0 May-06. 23
with an independent temperature sensor, which will
isolate the heating circuit.
This indicator can be used in addition to a controller
as an over temperature device. It is recommended that
the relay used to indicate the alarm condition should
be set to high alarm configured with sensor break and
inverse ‘
Inv
’ operation so that it relaxes to the alarm
condition when power is removed.
Installation requirements for EMC
To ensure compliance with the European EMC
directive certain installation precautions are necessary
as follows:
•
For general guidance refer to Eurotherm Controls
EMC Installation Guide, HA025464.
•
When using relay outputs it may be necessary to
fit a filter suitable for suppressing the emissions.
The filter requirements will depend on the type
of load. For typical applications we recommend
Schaffner FN321 or FN612.
•
If the unit is used in table top equipment which is
plugged into a standard power socket, then it is
likely that compliance to the commercial and
light industrial emissions standard is required.
In this case to meet the conducted emissions
requirement, a suitable mains filter should be
installed. We recommend Schaffner types
FN321 and FN612.
Routing of wires
To minimise the pick-up of electrical noise, the low
voltage DC connections and the sensor input wiring
should be routed away from high-current power
cables. Where it is impractical to do this, use shielded
cables with the shield grounded at both ends. In
general keep cable lengths to a minimum.