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Electrical connection
6.4 Electronic trigger unit MP 10
The compressor motor is fitted with cold conductor temperature sensors (PTC) connected to the
electronic trigger unit MP 10 in the terminal box. Readiness to operate is signalled by the H3 LED
(green) after the power supply is applied. In the case of excess temperature in the motor winding, the
unit switches off the compressor and the H1 LED lights red.
The hot gas side of the compressor can also be protected against overtemperature using a thermal
protection thermostat (accessory). The H2 LED (red) is provided for the protection function.
The unit trips when an overload or inadmissible operating conditions occur. Find and remedy
the cause.
INFO!
The device has a reclosure preventing feature. After eliminating the
fault, the device is quit by interrupting the mains power with the
external alarm reset switch S1 (see main-line wiring diagram, chap
-
ter 5.3). The reclosure preventing feature is unlocked and LEDs H1 or
H2 go off again.
Terminal box
Fig. 29
ATTENTION!
Terminals 1 - 6 on the trigger
unit MP 10 and terminals PTC
1 and PTC 2 on the compres-
sor 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, 14 and 43.
6.5 Connection of the trigger unit MP 10
INFO!
Connect the trigger unit MP10 in accordance with the circuit
diagram. 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.
Temperature monitoring connections:
Motor winding:
Terminals
1 - 2
Thermal protection thermostat:
Terminals
3 - 4
Restart prevention:
Terminals
5 - 6
Summary of Contents for Bock HGZ Series
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