Electric Connection While Operating the Pellet Mill

Connect the principal machine, control system and control cabinet with power supply according to local rules and regulations for electric connection.

Lay the power cables and install the circuit protection breakers according to power voltage and motor power as well as the stipulations of the supplier. Correctly connect and check all grounding wires.

Lay the power cables for the control and high voltage cabinets on the installation site. Touch screen or The local control box shall be installed at a distance of 0.5m ~ 3m on the right side (preferred) of the pellet mill or installed at a distance of 1.0m ~ 3m on the left side of the machine.



The motors shall be interlocked with each other when laying power cables, and switched on according to following sequence:
①Motor for Hydraulic system ( if required)
②Main motor for the pellet mill
③Motor for the conditioner
④Motor for the feeder

There shall be an unlocking device between the main motor and conditioner, so it needs not startup the main motor when star ting the conditioner individually. Connect the motors correctly while adjusting its rotating direction.

The working principle and operation flow of the control box show as follows:

Commissioning process:

Make sure all the preparation works of pelleting machines are ready, the electric connection have been completed.
And then close each circuit breaker;
Release the lock emergency stop button E-STOP;
Switch the unlocking switch SA1 to the unlocking position, start up and shut down each electric motor to check whether it normal works.

Normal starting process:

Switch the unlocking switch SA1 to the interlock position, trigger starting button SB3+, start up the main motor of pellet mill and wait for one minute, trigger starting button SB2+ after its steady operation, start up the conditioner and wait for 30 seconds, trigger starting button SB+, start up the motor of feeder;



Explanation of working process:

The feeding frequency can be changed by adjusting the knob RP2 into a change of feeding amount, frequency meter PF21 can real-time display the operating frequency of feeding motor.

Temperature instrument U2 can real-time display the Material Temperature at the discharge hole of conditioner, the Material Temperature at the discharge hole can be adjusted by charging the steam additive amount in conditioner;

Shut down the feeding motor when the working current of main motor of the pelleting machine is more than rating or it increase rapid within the rated current interval, switch to the selecting switch SA2, electrified the by-pass solenoid valve, thereby opening the by-pass gate, the feeds will be discharged from by-pass gate and the motor load of pellet mill will be reduced. After the motor load returns to 50% of the rating, restart the feeder, gradually increase the feeding amount.

Stopping process:

Shut down the feeder first, wait for ca.10 minutes and then shut down the conditioner, shut down the main motor and cut off the general power after the working current of main motor reducing into the range of no load current. The handling of leak, electric shock, stoppage or severely overload: Press the emergency stop button immediately, to avoid the accident of casualties and motor damage.