Use and Maintenance instructions
Submersible horizontal mixers
“ TBM “ series
Release 03 / 2014
19
8.2. Earth conductors connection
Yellow/Green earth terminals found in all power supply cables shall be connected to the earth
circuit of the system before connecting the other terminals; for disconnection, they must be the
last clamps to be disconnected.
8.3. Engine protection connections
Description
Electrical motors are equipped with thermal probes to avoid overheating. Thermal probes are normally
closed bimetallic switches installed in the motor windings. It is obligatory to connect them to a suitable power
source cut-out device
Once a temperature of 150°C (302°F) has been exceeded, the switches open and interrupt the power supply
to the remote control coil, thus stopping the electric motor. When windings are cooled, the contacts of
bimetallic switches reclose, allowing the motor to be started again. It is necessary that it should be given a
new start command in case of operation of the probes: provide adequate predisposition in control panel.
The probes can be connected at a max. voltage value of 250V and have a max. capacity of 1.6A a cosφ =
0.6.
Overload protection
The motor is to be protected against overload through a thermal delay relay according to NIN.
This is to be adjusted to the rated current indicated on the machine plate.
In case of star-delta starting the adjustable value is to be I
N
x 0.58. In both motor cables (U1, V1, W1 and U2,
V2, W2) electro-thermal all-pole triggers are to be incorporated.
9. COMMISSIONING AND OPERATION
When all the checks described in paragraph 8 have been scrupulously carried out, go on to the setting up
and then the running stage of the mixer. Before starting the machine, ensure that no solid parts are in the
tank. Mixer cannot be started if the propeller is not immersed at least whit 0.5m liquid over the higher part of
the propeller. Additional requirements for mixer Atex are given in §4.
During the use of the mixer it is important to observe a series of checks and/or warnings in order to preserve
mixer integrity.
These checks are detailed in §10 .
WARNING The machine is not equipped with a lighting device: it has to be installed in well-lit area.
9.1. Atex version
Once started the mixer ensure, during first hours of work, that the surface temperature of electrical motor and
gear box doesn’t exceed 93°C. Perform this control stopping electrical feeding of the motor and, with mixer
stopped, keep it away from the liquid and put it in an area far away from the dangerous zone. In case of
rising up of the temperature over the 93°C, stop immediately the machine and contact CRI-MAN.
Additional requirements for mixer Atex are given in §4.
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