Tips and tricks

The following presents some general tips for the smooth operation of m-tec machine installations. The details of your machine can be found in our operating instructions. We'll be pleased to help you further with any assistance you may need.

Conveying machinery

Compressor is not running.	No electricity	Check the power supply line to the installation or the supply line from the compressor to the switch cabinet.
Motor rotating in wrong direction	Phases are switched over.	Change the direction of rotation at the input plug.
Compressor runs in manual mode, but not in auto.	Probe cable not connected	Connect the probe cable to the compressor or rotating vane probe.
	Probe selector switch at OFF	Set the probe selector switch to AUTO.
	Probe control cable defect	Unplug cable, and examine and if necessary replace plug and coupling connections.
	Rotating vane probe not rotating	The probe's rotating vanes must rotate without impediment.
	Rotating vane probe defect	Replace the rotating vane probe.

Pivoted flap on pressure vessel not opening or closing	Control cable for rotating drive not plugged in	Plug in rotating drive cable
	Control cable defect	Unplug cable, and examine and if necessary replace plug and coupling connections.
Motor safety switch on pivoted flap is triggered.	Motor safety switch on pivoted flap is triggered.	Loosen the flap at the hand wheel on the rotating drive. Note the position of the positioning disc.
Too little or no material being pumped	Silo flap is not open.	Open and secure silo flap.
	Vibrator is not running.	Connect the vibrator cable to the compressor.
	Pressure loss in silo because pivoted flap does not close properly.	Check and if necessary readjust flap switch configurations. Clean and if necessary replace the seal.
	Conveyor time not set to optimal value	Setting based on experience approx 80–90 s for a conveying distance of 50 m

Delivery hose clogged with too much material	Hoses not laid in baffles	Lay hoses with rising and falling gradients.
	Filter bags are clogged.	Knock out the filter bags to clean them.
	Clogging in material flow	Clean the conveyor lines.
	Conveying air pressure controller set too high	Set the pressure controller to the specified value.

Mixer

Mixer motor does not start	There is no supply voltage.	Check the power supply and the fusing
	Mortar has solidified in the mixing pipe.	Clean the mixing pipe.
	Motor safety switch has triggered.	Open the switching box, and check the fusing.

There is no water.	Overload fuse has triggered.	Check the motor safety switch for the mixer motor.
	Solenoid valve does not open.	The coil may be defect. Replace the solenoid valve.

Mortar too stiff	There is too little water.	Check the water feed. The pressure must be at least 2 bar. A water pump may have to be installed upstream.
	The overload fuse for the water pump has triggered.	Check the motor safety switch for the water pump.
	The water flow valve is too tight.	Open the valve more.

Mortar viscosity too low	Water quantity too large	Close the water flow valve more.

Material consistency fluctuates.	Sieve clogged in pressure reducer or inlet screen	Clean the sieves.
	Filter hood fabric clogged with dust particles	Knock out the filter hoods.

Pump

Pump motor does not start.	No electricity	Check the fusing and cables.
	Screen at hopper is open.	Close screen.
	Safety switch is defect or has triggered.	Check and if necessary replace the safety switch.

Pump not running	Worm pump seized	Let the pump run repeatedly forwards and backwards.
	Malfunctions at the frequency inverter (when installed)	Set the main switch to OFF, and leave it at this position for at least 1 min. Afterwards, switch ON the machine.
	The remote control cable from the air pressure controller or adhesives gun is not connected to the switch cabinet.	Connect the control cable.
	Neutral wire is not connected.	Connect the neutral wire.

Circuit breaker triggering	Mortar consistency is too thick.	Adjust consistency.
	Pump end piece is clogged.	Clean pump end piece.

Pump motor no longer starts.	Air hose caught	Check air line.
	Air nozzle clogged	Clean nozzle.
	Air pressure controller set too low	Set the pressure controller to the specified value.

Pump cannot be stopped at the spray gun lever.	Compressor safety valve not closing	Unblock safety valve.
	Compressor safety valve is set too low.	Set the safety valve to the specified value.
	Air pressure controller is set too high.	Set the air pressure controller to the specified value.
	Compressor supplies too little air.	Check and if necessary replace the diaphragms and valve plates.

Motor safety switch on compressor triggering	Suction filter is clogged, and compressor runs hot.	Clean and if necessary replace the suction filter.

Adhesives gun: Material not discharging from adhesives gun	Adhesives gun clogged	Clean adhesives gun.
	Limit switch is defect.	Check and if necessary replace the limit switch.
Adhesives gun: Closing does not shut off material flow completely.	The lever mechanism is soiled.	Clean the lever mechanism.
	Caking between nozzle and sealing plug	Clean adhesives gun.
	Wearing on the closure	Replace the closure.

Frequency inverter: Overload protection has triggered.	Mortar consistency is too thick.	Set the mortar consistency.
	There are too many hoses connected.	Reduce the hose length.

Frequency inverter overheated	Cooler on frequency inverter is defect.	Have the cooler repaired or replaced.

Mixing pumps / silo mixing pumps

Machine not starting	No voltage supply	Check fusing at the building site main cabinet and supply line.
	Motor safety switch triggered	Switch motor circuit breaker back ON.
	Wrong phase polarity	Set the right phase polarity at the main or reversing switch.
	No water pressure	a) Check that the water supply line is open. b) Clean the water inlet sieve.
	Motor safety switch has triggered.	Switch ON the motor safety switch.

Pump does not start	Worm pump seized	Let pump run forwards/backwards once or twice, and if necessary replace the worm pump.
	Mixing pump motor is not connected.	Connect the cable.
	Remote control is active.	Open the air tap, and clean the air nozzle of any clogging. Set the air pressure controller to 1.8 bar, and if necessary replace this.

Motor safety switch triggers.	Material consistency is too thick.	Set to right consistency.
	Hose cross sections too small or mortar hoses too long	Use a larger hose cross section, or shorten the hose length.
	Pump end piece is clogged.	Clean pump end piece.

Dosing screw not starting	Dosing screw motor is not connected.	Connect the cable.
	Motor safety switch has triggered.	Reactivate motor safety switch; if necessary, replace the water pump.

Compressor not starting	Compressor not connected	Connect the compressor.
	Motor safety switch on compressor has triggered.	Switch ON the compressor.

Water quantity cannot be set correctly.	Pressure reducer set too low	Set pressure reducer to 2 bar.
	Inlet screen clogged	Clean sieve.
	Pressure reducer sieve clogged	Clean sieve.

Machine switches OFF during operation.	Motor safety switch / circuit breaker for controller triggered	Switch motor safety switch / circuit breaker for controller back ON.
	Water supply malfunction	– Check the water supply line. – Water tap open correctly? – Water hose kinked? – Clean inlet and pressure reducer screens.
	Motor safety switch has triggered.	Switch motor safety switch back ON, and if necessary clarify the cause of the fault.
	Safety circuit open	Lock the pump section, and the insert the wet slaking cap.
	Remote control active	Open the air tap, clean the air nozzle of any clogging, set the air pressure controller to 1.8 bar, and if necessary replace this.
Hose pressure gauge reads too high a pump pressure.	Mortar hose kinked or clogged	Lay mortar hoses correctly, or clean them.
	Hose cross sections too small or delivery hoses too long	Use a larger hose cross section. Shorten the hose length.
	Material consistency too thick	Reduce material viscosity at the fine regulating valve.

Pump motor cannot be switched OFF at the spray gun.	Spray gun fitting not closing properly, or leak in the air hose	Unblock the spray gun fitting, and check the air hose for leaks.
	Compressor safety valve set too low	Set the compressor safety valve to 3.2–3.5 bar.
	Air pressure controller set too high	Set pressure controller to 1.8 bar shutoff pressure.
	Compressor supplies too little pressure.	Check and if necessary replace the diaphragms and valve plates.