Datasheet Content
MZ4-MZ7
Servomotor
for modulating control valves
delta-elektrogas.com EE158 -10/24
ELEKTROGAS – Technical Sheet EE158 – 10/24
MZ4-MZ7
Servomotor
Contents
Description ………………………………………..….. 2
Features ……..……………………………..……..….. 2
Applications ...................................…………...……. 3
Selection table ........................................................ 4
Technical specifications .………………….…..…….. 5
Operation MZ4, MZ4A ............................................. 6
Operation MZ7 ……..….......................................... 11
Ordering information ....………………….……….… 16
Standards and approvals ………….……………..... 17
Description
MZ servomotor is designed for all applications which require precise and controlled rotary
movement. In particular, it can be used to operate VF, VFT, VFH and LMV valves for gas and air
flow in combustion processes, with positioning by means of switching cams (MZ4) or electronic
control (MZ4A, MZ7).
Features
Electrical motor with multi-stage spur gearbox inside a metal housing.
Provided with switching cams with adjusting screw.
Its rugged and functional design allows a fast and easy installation.
Available in Ex-proof version, for use in Zones 2 and 22, according to 2014/34/EU Directive
(ATEX).
High positioning precision performed by a 32-bit microcontroller.
Status LEDs and position indicator of the motor visible externally.
Two push-buttons for manual adjustment of the position.
Two push-buttons to save min./max. positions (MZ7).
Analog input and output signals for electronic positioning.
The same unit is suitable for different voltages.
Adjustable opening time from 7s up to 90s.
Long-life brushless motor.
! This control must be installed in compliance with the rules in force.
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ELEKTROGAS – Technical Sheet EE158 – 10/24
Applications
- 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.
VF..MZ
Fig. 1
- In case of combustion process with
VF..MZ
excess of air or gas, VF butterfly valve
can be used, coupled to a Lambda
sensor for ratio correction.
VF..MZ
Fig. 2
- In case of combustion process with
pre-heated air, VFH butterfly valve can
be used with MZ servomotor.
VFH..MZ
Fig. 3
! Location and mode of installation must be in compliance with local rules in force.
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ELEKTROGAS – Technical Sheet EE158 – 10/24
Selection table
MZ4 MZ4A MZ7
Control
2-point
3-point
Analog
Digital
Torque
5 Nm
10 Nm
Running time per 90°
7s
15 s
30 s
60 s
7...90 s continuous (1)
Voltage
230VAC 50/60Hz
110-120VAC 50/60Hz
24VDC
Inputs
Main voltage
0-10 V
0-20 mA
4-20 mA
Digitals 24VDC or 110-230VAC (2x)
Outputs
0-10 V
0-20 mA
4-20 mA
Relays (2x)
Limit Switching cams (2x)
Aux. Switching cams (2x)
Options
X= Ex-Proof execution
P1= Potentiometer 1k as output (2)
P2= Redundant position control (2)
Standard Optional Adjustable Not available
(1) Custom rotation time can be set at the factory before shipping, or adjusted by the user.
(2) Options P1 and P2 are alternatives.
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ELEKTROGAS – Technical Sheet EE158 – 10/24
Technical
specifications
Weight 2,4 Kg
Rotation angle 0 / 90° MZ7
0 / 180° MZ4, MZ4A (0 / 90° with potentiometer)
Position repeatability ±0,25°
Ambient temperature -15°C / +60°C
Voltage tolerance -15% / +10%
Power consumption 10 VA max
Protection class Class I (EN 60335-1)
Enclosure IP65 (EN 60529)
Cable gland M20x1,5 (2x) for cable O.D. 7 / 12 mm (EN 62444)
Wires cross-section 2,5 mm2 max
Holding torque 5 Nm
Analog inputs Signal type 0-10V 0-20mA 4-20mA
Overload max. 12Vdc 25mA 25mA
Load impedance 10K 100 100
Analog outputs Signal type 0-10V - 4-20mA
Load max. 10mA 350
Position switches/relays Voltage Resist. Load Lamp. Load Induct. Load
max electrical rating 250VAC 2A 0,3A 0,3A
Feedback Potentiometer 1K ±20% (±2% linearity)
(optional for MZ4 only) 18V max, 0,5W max, Iw≤ 1μA
Overall dimensions
Shaft detail
Fig. 4 Fig. 5
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ELEKTROGAS – Technical Sheet EE158 – 10/24
Operation MZ4, MZ4A
This unit is designed for all applications that require high precision control of rotary movement.
Inside the compact servo drive housing there is a BLDC electric motor, a gearbox and a control
unit with a 32-bit microcontroller.
I
I
F
Fig. 6
A Main terminal block J SW1 limit switch (MIN)
B Pin jumpers (J8) K SW2 limit switch (MAX)
C Optional terminal block (analog/Pot) L Alarms Led (red)
D Potentiometer (optional) M Status Led (blue)
E Cams (C1, C2, C3, C4) N BLDC motor
F Motor connection plug O Plastic cover
G Closing push button (B1) P Position indicator
H Automatic/ Manual switch (S1) Q Dipswitch
I Opening push button (B2) R USB port (reserved)
S Programming port (reserved)
The shaft rotation angle can be controlled via two voltage inputs, in conjunction with switching
cams (C1, C2). In the MZ4A type, position control can be performed either with two voltage inputs
or with an analog signal.
The servomotor is provided with two buttons for manual adjustment of the position during the
commissioning and with two auxiliary cams (C3, C4) which activate switches for the monitoring
of intermediate positions or to control external devices. Two led show the current status of the
unit (e.g. manual operation, alarms, etc.).
The most of settings can be made with a dipswitch and some jumpers.
The current position can be monitored via an integrated potentiometer (optional) in MZ4 version,
or an output analog signal in MZ4A version.
The potentiometer cannot be retrofitted, but it must be factory-installed as options.
! The potentiometer must be connected as a voltage divider with a high impedance load.
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ELEKTROGAS – Technical Sheet EE158 – 10/24
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