MZ Advanced servomotor for VF-VFH butterfly valves
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MZ Servomotor for butterfly valves VF, VFH

ELEKTROGAS – Technical Sheet EE157 - 03/11 Description Servomotor MZ is designed to operate VF and VFH butterfly valves, used with electronic positioning control of gas and air flow in combustion processes. Features DC motor with multi-stage spur gearbox. High positioning precision performed by a 16-bit microcontroller. Status LEDs and position indicator of the motor visible externally. Provided with cams with double adjusting screw (adjustment tool included in the housing). Two push-buttons for manual adjustment of the position. Two push-buttons to save min./max. positions. Analogue input...

ELEKTROGAS – Technical Sheet EE157 - 03/11 Functioning and application - In case of combustion process being regulated by combustion air modulation, VF valves with servomotor can be used, coupled to another butterfly valve manually operated (available graduated scale and locking screw) to setup high-fire rate of the burner. - In case of combustion process with excess of air or gas, VF butterfly valve can be used, coupled to a Lambda sensor for ratio correction. - In case of combustion process with pre-heated air, VFH butterfly valve can be used with MZ servomotor. WARNING Location and mode...

ELEKTROGAS – Technical Sheet EE157 - 03/11 Technical specifications Continuous adjustment of position by analogue signals Overall dimensions Rotation angle Position repeatability Ambient temperature Voltage rating Voltage tolerance Power consumption Protection class Cable gland Wires cross-section Torque (=holding torque) Position switches electrical rating Resist. Load Lamp. Load Induct. Load Analogue inputs Signal type Overload max. Load impedance Analogue outputs Signal type Load max. Adapter set for VF butterfly valve (Set M) Adapter set for VFH butterfly valve (Set MH)

ELEKTROGAS – Technical Sheet EE157 - 03/11 Operation This unit is designed for all applications that require high precision control of rotary movement between 0° and 90° Inside the compact servo drive housing there is a DC electric motor, a . gearbox and a control unit with a 16-bit microcontroller. Main terminal block Analogue signals DIP switch Cams (C1, C2) Closing push button (B1) Automatic/ Manual switch (S1) Manual operation LED1 (green) Opening push button (B2) MAX push button (B3) Warning LED2 (red) Status LED3 (green) MIN push button (B4) Board connector for Terminal (T1)...

Direct motor driving ELEKTROGAS – Technical Sheet EE157 - 03/11 Opening (B2) LED1 Automatic/ Manual (S1) Manual mode For a simplified commissioning, the actuator can be operated manually. The manual mode is useful to determine the operating positions for the process, such as the High/Low fire positions. To enter in the manual mode shift the switch S1 upward (LED1 lights up). Now it's possible to move the valve toward the 90° position (counter clo ckwise rotation seen from the top), by pressing the button B2, and to move the valve toward the 0° position (clockwise rotation seen from the...

ELEKTROGAS – Technical Sheet EE157 - 03/11 Automatic mode In the automatic mode the angular position corresponds to the input analogue signal provided by a setpoint device. Factory setting allows full range of operation (0-90° but, as above ) described, MIN and MAX position can be set within this range in manual mode. An output analogue signal proportional to angular position is also provided. Both input and output signals can be chosen between 0-10V, 0(4)-20mA setting the proper DIP switch configuration (see "DIP Chart"). Behaviour without input signal (4-20mA) In the event of cable break...

ELEKTROGAS – Technical Sheet EE157 - 03/11 Hysteresis and Filtration The input analogue signal is processed internally with a resolution of 12 bit , corresponding to 0,025% of full scale. However, the hysteresis can be modified by means of a potentiometer from 10 up to 124 LSB (corresponding to 0,25% up to 3% of full scale). The factory setting is 30 LSB, and this allows, with a 4-20mA input signal for example, to detect a change of 0,15mA (hysteresis). If the input signal fluctuations are too great (e.g. due to noise), use of high resolution causes constant corrections of the position. In...

ELEKTROGAS – Technical Sheet EE157 - 03/11 Input analogue signal 1 Analogue signals Output analogue signal OFF ON Behaviour without input signal (4-20mA) OFF ON

ELEKTROGAS – Technical Sheet EE157 - 03/11 Operating state Fast flashing Automatic mode Slow flashing Manual mode Permanent light when position has been saved Permanent light while buttons are being pressed Fast flashing: 4 times per second State description Setting of the MIN and MAX positions (Manual mode) Running time setting (Manual mode) Slow flashing: 1 time per second Alarms chart Tab.3 Alarm Nr. Alarm type Input signal is missing (4-20mA) Cable break or disconnected, remote control defective Invalid position Operator has attempted to save an invalid position (e.g. MIN>MAX) Invalid...

ELEKTROGAS – Technical Sheet EE157 - 03/11 Model Type Z= advanced Running time (1) 7s 15 s 30 s 60 s 7...60 s continuous (2) Voltage A= 230VAC 50/60Hz B= 110VAC 50/60Hz C= 24VAC/DC Inputs 0-10 V 0-20 mA 4-20 mA Outputs Potentiometer 0-10 V 0-20 mA 4-20 mA For more information about butterfly valves see their technical sheets. Optional Adjustable Not available (1) to be specified if time is different from 30s and its setup has to be done in factory prior despatch (2) customized time can be set up by user Standard Manufacturer reserves the right to update or make technical changes without...