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5| Electrical connection
5.4 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.
D
5.5 Connection of the trigger unit INT69 G
GB
1
F
E
or Protection MP10
L
S
M
1 N
N 43 43 11
12
14
Steuerstrom-
kreis
5.6 Function test of the trigger unit INT69 G
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.
18
(accessory).
INFO
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.
INFO
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.
ATTENTION M easur e cir cuit
BT1 and BT2 (PTC
sensor) must not
R2
R1
come into contact
w i t h e x t e r n a l
voltage.
X2 1
2
3
4
5
6
This would destroy
the trigger unit
+
+
Θ
Θ
INT69 G and PTC
BT2
BT1
sensors.
-
-
3
INT69 G
OG
OG
L
N
+
Θ
BT1
-
+
Θ
BT2
-
4
B1 B2
12
14
11
N
L
Control circuit
Steuerstrom-
kreis
Fig. 15
Terminal box
5
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