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Electrical connection
5.10 Function test of the trigger unit INT69 EX2
5.9 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, thermal protection thermostats of the
cylinder cover, pressure and temperature monitoring of the system according to the wiring diagram
(fig. 20+21). 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 compressor
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
connected 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 itself are not intrinsically safe. A barrier including plug-in base, is
included.
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. 22
INFO
In case of malfunction, the system has to be checked and defective
components must be replaced!
