PIREG 545 cUL Operators Guide 2021
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If series-connected heat seal bands must be used, the effect on the over-current reaction if two sealing
bands on opposite side should touch needs to be taken into consideration.
1.6. Impulse Transformer
The sealing transformer must be configured according to EN 61558 (VDE 0570) resp. UL 5085 (isolating
transformer with reinforced isolation) and in a single-chamber design
Caution:
There must be sufficient protection against accidental contact if the transformer is in-
stalled in a machine frame. Furthermore, ensure that water, cleaning liquids or conducting liquids
do not come into contact with the transformer. The conductor wiring cross sections should be
designed to match the actual currents. Non-observance of these notes may result in impairment
of the electrical safety.
For best results, the transformer's performance and the secondary voltage must be properly designed for
the given heat seal band (refer to the TOSS Application Report). The rate of the heat-up time is determined
by the secondary voltage being supplied. The proper selection of the secondary voltage for a target tem-
perature increase of 300°C should only allow for a heat-up period of
240 ms.
Measuring impulses continue while the PIREG
®
-545 is in the OFF state. Therefore, the higher the second-
ary voltage for a given heat seal band the greater the difference may be between the actual resting tem-
perature and the ambient temperature.
1.7. Current Transformer
The current transformer is an essential part of the control system. Only the Toss CT-50 current
transformers may be used. The current transformer may only be operated with ballast resistance.
The ballast resistance is integrated into the PIREG
®
-545. The current transformer must be
mounted in such a way that magnetic leakage fields from the sealing transformer or other leakage
fields do not affect the measurement.
Caution:
The used cable to the heating conductor can heat up the current transformer.
1.8. Line filter
A suitable line filter must be used to comply with the EMC directives listed in section 1.10. This guaran-
tees compliance with the limit value for interference emission and are an essential component to the CE
mark. The correct specification of the line filter is determined by the current load of the specific heat seal-
ing application.
This information can be found on the TOSS application report. It is important that the filter’s supply wires
not be run parallel with the filter’s output wires.
1.9. General assembly instructions and dimensions
The PIREG
®
-545 resistance temperature controller is only suited for use in an electrical cabinet. Open
operation is not permitted. The controller is designed for mounting in a control panel and the current trans-
former is mounted on a 35mm mounting rail as per EN 60715 (EN 50022). When assembling the controller
on the control panel, there must be a distance of at least 20mm away from any adjacent devices. Heat
dissipation from neighboring devices must be taken into account (note the ambient temperature specifica-
tions).
