Operating Instructions ® MAVOWATT 4 Multifunction Power Meter 3-348-721-02 4/7.
1 2 3 4 A V 5 6 Figure 1 2 GMC-I Messtechnik GmbH
Operating controls 1 Connection terminals 2 3 4 5 6 Current Voltage Mirror scale Mechnical zero adjuster Selector switch for voltage ranges Selector switch for current ranges Function switch I* (1), I (3) L1 (2), L2 (5), L3 (8) 50 V / 100 V / 250 V / 500 V 0.25 A /1 A /5 A / 25 A Symbols The position of the function switch is marked by symbols.
Contents 1 Safety precautions .....................................................................5 2 Application .................................................................................6 3 Getting started ...........................................................................7 3.1 3.2 3.3 3.4 Description of the operating controls ..........................................................7 Installing the batteries .........................................................................
1 Safety precautions This instrument fulfills the requirements of the applicable European and national EC guidelines. We confirm this with the CE marking. The relevant declaration of conformity can be obtained from GMC-I Messtechnik GmbH. The multi-function power meter MAVOWATT 4 is constructed and tested in compliance with the safety rules of DIN VDE 0410 /IEC 414 and VDE 0411-1/EN 61010-1/IEC 61010-1. When properly used, the safety of both the user and the meter is assured.
Repair, replacement of parts and calibration When opening the meter, live parts may be exposed. Therefore, the meter must be disconnected from all voltage sources prior to opening its case for repair, replacement of parts or calibration. If repair or calibration can then not be avoided unless the meter is open and live, this work must only be performed by a qualified person who understands the danger involved.
3 Getting started 3.1 Description of the operating controls There are five connection terminals (1, figure 1), arranged on the front of the power meter, two for current connection with the markings I* (1) and I (3) and three for voltage connection with the markings L1 (2), L2 (5) and L3 (8). They are contact-protected. The operating panel of the power meter consists of: One selector switch for the voltage ranges (4, figure 1), with the four ranges 50 V, 100 V, 250 V and 500 V.
3.4 Battery test To test the battery for the voltage path and the battery for the current path, set the function switch to the positions " 1" and " 2", one after another. When, at a time, the pointer is within the battery section marked " " on the scale, the battery voltages are within the permissible range. It is assured that the error limits according to the data given in chapter 5 „Specifications“ are maintained. 4 Measurement 4.
Prior to measuring, always set the selector switch for the current ranges and that for the voltage ranges to the highest range. Make sure that the set nominal values are never exceeded by more than 1.2 times. For power measurements on DC and single-phase AC systems, set the function switch to the " " position, for power measurements on three-wire, three-phase systems of balanced load to the " " position.
4.2 Connection circuitries Current and voltage input takes place on the meter via connectors which are suited for both plugging (banana plugs) and as terminals (e.g. cable lugs). The current path is run to the two connectors I* (1) and I (3), the voltage path to connectors L1 (2), L2 (5) and L3 (8). For DC current and for single-phase AC systems, the voltage must be applied to L1 (2) and L2 (5), for three-wire, three-phase systems (without neutral conductor) to L1 (2), L2 (5) and L3 (8).
Active power and power factor measurement on single-phase AC systems Direct connection: Connection via current transformer: L1 N N (L2) (L2) L1 K L k l I* I L1 L2 L3 I* I L1 L2 L3 (1) (3) (2) (5) (8) (1) (3) (2) (5) (8) P (W) = I · U · cos =·c · üI P (W) = I · U · cos =·c Connection via current and voltage transformer: L1 N (L2) K k P (W) = I · U · cos =·c · üI · üu GMC-I Messtechnik GmbH L U l u V v I* I L1 L2 L3 (1) (3) (2) (5) (8) 11
Active power and power factor measurement on three-wire, three-phase systems, balanced load L1 L2 L3 Direct connection: P (W) = 3 · I · U · cos =·c L1 L1 L2 L3 L2 L3 I* I (1) (3) I* I L1 L2 L3 (1) (3) (2) (5) (8) L1 L2 L3 (2) (8) L1 L2 L3 I* I (2) (8) (1) (3) (5) Connection via current and voltage transformer: Connection via current transformer: L1 L1 L2 L2 L3 L3 K k L l (5) K k L l U u V U V v v u I* I L1 L2 L3 I* I L1 L2 L3 (1) (3) (2) (5) (
Reactive power measurement on three-wire, three-phase systems of balanced load It is easy to determine the reactive power on three-wire, three-phase systems of balanced load. Set the function switch to the " " position. To obtain the reactive power, multiply the found value (pointer deflection x scale factor) by the factor of 3. With a connection according to the following wiring diagram and a positive indication, the measured reactive power is inductive.
Example 1: Direct connection of the meter for single-phase AC systems Selected nominal current range 5A Selected nominal voltage range 100 V a) Function switch Reading scale according to table Value read off the scale Measured result: in position „ ” 0 ... 500 e.g. 350 P = · c = 350 · 1= 350 W b) Function switch Reading scale according to table Value read off the scale Measured result: in position „U ” 0 ... 100 e.g.
4.4 Internal consumption of the power meter and its influence on the accuracy The MAVOWATT 4 power meter needs a certain amount of energy for the presentation of measured values. Due to the internal meter consumption, the measured value always includes an error. In most cases – particularly so when measuring higher power – the influence is so small that it can be neglected.
4.5 Voltage and current measurement Even if the meter is connected for a power measurement, you can use the power meter to measure voltages and currents on both DC systems and single-phase AC systems and/or three-wire, three-phase systems of balanced load. For DC and single-phase AC systems, the voltage must be applied to L1 (2) and L2 (5). Terminal L3 (8) must not be connected.
4.5.2 Current measurement Set the function switch to the I and/or I~ position and the selector switch for the current ranges to the range corresponding to the measured value. The selector switch for the voltage ranges may be set to any position. Connect the current path to terminals I* (1) and I (3). Read the measured value off the scale corresponding to the measuring range and multiply it by the factor of 0.01 (see table in chapter 5 „Specifications“). 4.5.
5 Specifications Measuring ranges for DC and single-phase AC systems Factor c at scale division Nominal Nominal Nominal power voltage current 0...100 0...250 0...500 W V A 0.2 5 1 5 25 50 12.5 100 25 ----- 0.05 --- 0.1 --- 250 500 62.5 --- 0.25 --- 125 --- 0.5 --0.
Nominal current A 1 5 25 Nominal voltage Nominal power Factor c at scale division V W 50 100 0...100 1 0...250 --- 0...
Inputs Voltage path Nominal voltage UN Input resistance Ri 50 V / 100 V / 250 V / 500 V 1 M Current path Nominal current IN Input resistance Ri 0.25 A / 1 A / 5 A / 25 A 8 m Voltage drop U at nominal current 2.1 mV / 8.4 mV / 42 mV/ 210 mV Internal consumption Pi at nom. current 0.0005 VA / 0.0084 VA / 0.21 VA /5.25 VA Electrical isolation between voltage path and current path by optocoupler, test voltage 3.
Current for current measurement: for power factor measurement: 0 ... 1.2 · IN 0 ... 1.0 · IN 0 ... 1.2 · IN / 25 A : 0.3 ... 1.0 · IN Power factor at power factor measurement: cos = 0 ... 0.866 ... 1 cos = 0 ... 0.95 ... 0.99 Battery voltage 6.6 ... 11 V (for each of the two batteries) Other influence quantities according to EN 60 051, IEC 51 Nominal ranges of use Temperature 0 ... 21 ... 25 ... 50 C Frequency for voltage measurement: 10 ... 16 ... 65 ... 400 Hz 10 ... 16 ... 65 ...
Electromagnetic Compatibility EMC Interference Immunity and Emission EN 61326 Mechanical Design Display Moving-coil movement Scale length 96 mm Protection type IP 50 per VDE 0470 Partl 1 Dimensions 110 mm x 181 mm x 62 mm Weight approx. 0.8 kg 1) 2) The measurement is independent of the position of the selector switch for the voltage ranges. Symmetry error of the delta voltage with power factor measurement on three-phase systems is 0.5% at a maximum.
Caution ! Be absolutely certain that only the specified fuses are used! The use of a fuse with different triggering characteristics, a different nominal current or a different breaking capacity places the operator, damping diodes, resistors and other components in danger. The use of repaired fuses or short-circuiting of the fuse holder is prohibited.
Accredited measured quantities: direct voltage, direct current values, DC resistance, alternating voltage, alternating current values, AC active power, AC apparent power, DC power, capacitance, frequency and temperature 8 Product Support When you need support, please contact: GMC-I Messtechnik GmbH Product Support Hotline Phone +49 911 8602-0 Fax +49 911 8602-709 E-Mail support@gossenmetrawatt.
