D
US
20 | AQ450435606290en-US0201
© Danfoss | Climate Solutions | 2023.06
5.4 Electronic trigger unit INT69 G
5.5 Connection of the 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 (accessory)
.
The unit trips when an overload or inadmissible operating conditions occur. Find and remedy
the cause.
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-
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.
Οnderung
Klebeschilder
0
Datum
Name
Datum
Bearb.
Gepr.
Norm
1
04.12.2009
Kelich
22.05.2015
Urspr.
2
Ers. f.
3
Ers. d.
4
Schaltplan
5
6
7
BOCK COMPRESSORS
8
=
+
9
Bl.
MP10 INt69
Bl.
MP10 INt69
INT69 G
Motor Protection MP10
Steuerstrom-
kreis
L
N
Steuerstrom-
kreis
L N
11
12
14
B1 B2
OG
OG
+
-
BT1
Θ
X1 L1 L1 N N 43 43 11
12
14
L
S
M
X2 1 2 3 4 5 6
R1
R2
+
-
BT1
Θ
+
-
BT2
Θ
+
-
BT2
Θ
L
N
5
|
Electrical connection
Terminal box
Fig. 14
Control circuit
Measure circuit
BT1 and BT2 (PTC
sensor) must not
come into contact
w i t h e x t e r n a l
voltage.
This would destroy
the trigger unit
INT69 G and PTC
sensors.
