GEA pluscom Bock EX-HG12P, Assembly Instructions Manual, Page: 25 / 44

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5 | Electrical connection
5.8 Function test of the trigger unit INT69 EX2
Before commissioning, after troubleshooting or making changes to the control power circuit, check
the functionality of the trigger unit. Perform this check using a continuity tester or gauge.
Gauge state Relay position
Deactivated state 11-12
INT69 EX2 switch-on 11-14
Disconnect hot gas sensor one-sided in the
compressor terminal box
11-12
Connect hot gas sensor one-sided in the
compressor terminal box
11-12
Reset after mains on 11-14
Relay position INT69 EX2
B2 12 14 11
Fig. 20
5.7 Connection of the trigger unit INT69 EX2
INFO
When the device is triggered, an overload or impermissible opera-
ting conditions are present. Determine the cause and repair it.
Wire the PTC temperature sensor of the compressor motor, heat protection thermostats of the cylinder
head, pressure and temperature monitoring of the system according to the wiring diagram (fig. 19).
Pay attention for connecting the PTC sensor.
Terminals 1 + 2 on the trigger unit INT69 EX2 and terminals PTC 1 and PTC 2 on the compres -
sor terminal board must not come into contact with mains voltage. This would destroy the
trigger unit and PTC sensors
The supply voltage at L1-N (+/- for DC 24 V version) must be identical to the voltage at
terminals 11, 12 and 14.
Connections between terminals in the terminal box to which thermal protection thermostats are con-
nected and the electronic trigger unit INT69 EX2 must be designed as intrinsically safe sensor circuits
and clearly marked in accordance with EN 60079-14. Appropriate measures (e.g. barrier) must be
taken.
Make the connecting lines intrinsically safe. Do not exceed the maximum resistance of 50
Ω
!
Take into account the resistance values of the thermal protection thermostats:
- Motor sensor as triple PTC resistor: 50 - 450
Ω
(R
cold
at + 25 °C), not intrinsically safe.
- Hot gas sensor: Cold resistance
≤
100
Ω
(R
cold
at + 25 °C per thermal protection thermostat)
The sensor outputs of the INT69 EX2 elf are not intrinsically safe. A barrier including plug-in base, is
included.
INFO
In case of malfunction, the system has to be checked and defective
components must be replaced!