GEA Bock HG88e - Manual (Page 24)

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5| Electrical connection
5.6 Electronic trigger unit INT69 G
5.7 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 INT 69 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.
PTC1
PTC2
N L B1 B2 12 14 11
PTC
Motor Protection INT69 G
Terminal box
Abb. 23
supply
Lock out
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-
gram. Protect the trigger unit with a delayed-action fuse (F) 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
PTC cable on the trigger unit
INT69 G and terminals PTC 1 and
PTC 2 on the compressor termi-
nal board must not come into
contact with mains voltage.
This would destroy the trigger
unit INT69 G and PTC sensors.