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5| Electrical connection
5.7
Electronic trigger unit INT69 G
The compressor motor is fitted with cold conductor temperature sensors (PTC) connected to the
electronic trigger unit INT69 G in the terminal box. In case of excess temperature in the motor
winding, the INT69 G deactivates the motor contactor. Once cooled, it can be restarted only if the
electronic lock of the output relay (terminals B1+B2) is released by interrupting the supply voltage.
The hot gas side of the compressor can also be protected against overtemperature using thermal
protection thermostats
The unit trips when an overload or inadmissible operating conditions occur. Find and remedy
the cause.
5.8
Connection of the trigger unit INT69 G
US
1
or Protection MP10
L
S
M
1 N
N 43 43 11
12
14
Steuerstrom-
kreis
22
(accessory).
The relay switching output is executed as a floating changeover
contact. This electrical circuit operates according to the quiescent
current principle, i.e. the relay drops into a the idle position and
deactivates the motor contactor even in case of a sensor break or
open circuit.
Connect the trigger unit INT69 G in accordance with the circuit dia-
2
gram. Protect the trigger unit with a delayed-action fuse (FC2) of
max. 4 A. In order to guarantee the protection function, install the
trigger unit as the first element in the control power circuit.
Measure circuit BT1
and BT2 (PTC sensor)
must not come
R2
R1
into contact with
external voltage.
This would destroy
X2 1
2
3
4
5
6
the trigger unit
INT69 G and PTC
+
+
Θ
Θ
sensors.
BT2
BT1
-
-
3
INT69 G
OG
OG
L
N
+
Θ
BT1
-
+
Θ
BT2
-
4
B1 B2
12
14
11
N
L
Steuerstrom-
Control circuit
kreis
Fig. 14
Terminal box
5
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