455-461 Series
4.5.7 Partial load failure detection circuit output
(461 series)
On 461 series units, equipped with a partial load failure detection in their standard version, the
alarm is indicated:
• b y an
indicator light
mounted on the front fascia
(lit when a partial load failure is detected)
• by the
contact
of an alarm relay
(contact output is available on terminals 1 and 2)
The alarm relay is exited outside the alarm status when the unit power is on.
The alarm contact (cut-off power 0.25 A ; 250 Vac or 30 Vdc) is
open
in alarm status or in
the event of a supply failure.
As an option (code 83), this contact is closed in alarm status.
This output is suitable to drive a EUROTHERM, type 603 alarm unit.
4.5.8 Load current image output (461 series)
The "Load current image" output is available between terminals 3 and 6 (0 V) on 461 series
units. I t can be used for tests or for an external measurement (rms value using 443 converter).
The double wave rectified output signal is directly proportional to the load current (mean 5 V
for the nominal unit current of the thyristors in full firing).
4.5.9 Load voltage image output
The "Load voltage image" output is available between terminals 15 and 6 (0 V).
It is a double wave rectified signal (mean 4.3 V) representing the load voltage in full firing,
produced from the
power supply.
451-461
User Manual
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