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Installation-, Operating-, Maintenance-Manual, Spare Part List
EEx-Protection and Electrical Components
Point 20.0
Explosion-protected control unit for the refrigerant compressor
Explosion protection acc. EN60079/ff; EEx de (ia) IIC T6
Protection rate acc. EN60529: IP54
Composed of pressure resistant encapsulated housing (Ex d) and shielded enclosure "Advanced
Security" (Ex e). The shielded enclosure "Advanced Security" contains rail-mounted terminals to
apply the electrical connection cables. Between pressure resistant encapsulated housing (Ex d)
and shielded enclosure "Advanced Security" (Ex e) special line bushing for EEx-area are installed.
The pressure resistant encapsulated housing (Ex d) contains:
EEx - i – Switch amplifier, relay output (A1)
Protection switch (F1)
Switch relay (K1)
Startup relay (K2)
Startup capacitor (C1)
A1
EEx-i Double switch amplifier, relay output
mounted in the pressure resistant encapsulated housing
The first switch amplifier provides an intrinsically-safe circuit, that connects the switching
contacts of the safety devices F2/F3 (20.1), F4 (20.3) and F5 (20.2) in a series. If one of the
contacts opens, the switch relay K1 is switched off over the relay output of the switch amplifier
so that the refrigerant compressor stops working.
The second switch amplifier provides an intrinsically-safe circuit to the temperature control unit
B1 and switches a changeover contact. This changeover contact is potential-free and can be used
as an alarm- or operation notification.
F1
Protection switch, refrigerant compressor
mounted in the pressure resistant encapsulated housing
At too high current consumption this device protection directly switches off the refrigerant
compressor. After problem solving it needs a manual reset.
K1
Switch relay, refrigerant compressor
mounted in the pressure resistant encapsulated housing
The switch relay puts through the charging current of the refrigerant compressor and is
controlled by the switch amplifier (A1)
K2
On delay startup relais
mounted in the pressure resistant encapsulated housing
At the startup of the refrigerant compressor the time relay provides power to the starting
winding. After performed startup of the refrigerant compressor it automatically switches off.
C1
Startup capacitor
mounted in the pressure resistant encapsulated housing
With its electric charging the startup capacitor boots the power to the starting winding and
provides a higher engine starting torque to the refrigerant compressor. The startup capacitor is
equipped with a discharge resistor that discharges the capacitor by the switch-off of the time
relay.
AGT-PSG GmbH & Co.KG
Errors and printing mistakes excepted
Translation - Manual BCR05 Rev. 06/2017
BCR05
Page 34
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