APM382 Unipower Technical Information Version 1.0 Overview The Unipower APM382 is a combined Electronic Power Measurement Transducer and Load Monitor that measures power in kW on 3-phased asymmetric loads, also after frequency inverters, according to the formula: P = 3 x U x I x Cos * Suitable for mains voltages from 3x230V to 3x575V * Measures after frequency inverters PWM 10Hz - 1kHz * 10 Current measuring ranges up to 80A internally * Digital scaling of the selected range (Zoom) * Programmable filter function (analogue and digital) * 2 independent alarm limits plus dP/dt (shock load) alarm * Alarm inhibit inputs and external reset input * Optocoupled alarm outputs * 0(4)-20mA and 0(2)-10V analogue outputs * Galvanic isolation between mains net and I/O (incl. 24V) * Setup of parameters via PC with software 382Mon Features Power measurement and 4-20mA simultaneously. 20mA (10V) is generated at nominal current, The power measurement is performed by a specially developed circuit nominal voltage and cos=1. Selecting an invalid voltage range results which is capable of measuring the waveform of the voltage and current in both outputs set to 0mA (0V). Both outputs may be inverted for use in signals on the output of a frequency inverter. The unit contains a 4 step a control loop. programmable analogue filter and 3 digital filters which may be used to Digital inputs improve accuracy at frequencies down to 10Hz. The unit is equipped with 6 digital inputs. In the standard version only Voltage measurement S1 - S5 are used. All digital inputs are activated (On) when connected to The APM382 is suitable for mains voltages from 3x230V to 3x575V. the +12 output (23), or an external +12-24Vdc source. The integrated measurement system is designed for measuring after Digital outputs frequency inverters - i.e. between the frequency inverter and the motor. 3 optocoupler outputs (Out1, Out2, Out3) are available for signalling Hence the APM382 is not powered by the measuring voltage like the alarms. They are On under normal conditions and Off during alarms. The majority of the Unipower products, but by a 24Vdc. One of 7 mains output function may be inverted but is set common for both outputs. If voltage ranges is selectable from the front plate. an invalid voltage range is selected both outputs are set Off. Current measurement LED indicators The APM382 directly measures up to 80A with internal CTs. To take The APM382 has 4 LED indicators. The LED marked Load indicates advantage of the large measurement range, the unit has 10 current ran- that the 24Vdc is connected. If the measured load is below 3% of the ges making APM382 suitable for nominal currents below 1A and up to measurement range this LED flashes. The LED marked Aux is used as 80A. The current range is set by a selector switch on the front plate. indicator for the start timer (Ts) as well as a dP/dt-alarm. The LEDs Analogue output marked Limit 1 and Limit 2 flash concurrently, if an invalid voltage The APM382 features voltage and current outputs configurable as 0- range is selected, but otherwise indicate the status of the two limits 20mA (0-10V) or 4-20mA (2-10V). It is not possible to generate 0-10V LED On = Tr active, LED flashing = Alarm. Technical Specifications Mechanical Electrical Housing: Lexan UL94V-0 (Top) Supply: 24Vdc 10%, max 150mA Noryl UL94V-0 (Bottom) Measurement voltage: Max. 3x600V (PWM) Mounting: M36 for 35 mm DIN rail Current input: Nominal 40A IP class: Housing IP40. Terminals IP20 Frequency: 10Hz - 1kHz 2 Terminals: Max 16A. Max 2,5 mm Accuracy: Class 2% Terminal tight. torque: 7lbs/in, 0.79Nm Analogue output 1: 0(4)-20 mA max 300 Use 60/75 copper (CU) wire only Analogue output 2: 0(2)-10V min load 10k O Opp. Temp.: -15 to +50 C surrounding air Digital inputs: 12 - 24V DC Weight: 300 g Digital outputs: Optocoupler, max. 30V/30mA Dimens.: D 58 x W 102 x H 86 mm Serial port: RS232C, 9600 Baud CE mrk: EN61326-1, EN61010-1 UL certified: UL508, File E350194Iout polarity : Normal or inverted Digital filter : 3, 6 or 10s (Analogue output only) Zoom - P1Max : 10 - 100% (Of the range) Zoom - P1Min : 0 - 90% (Of the range) Output polarity : Noninverted or inverted Auto Shut Down : On or Off Please refer to Technical description on our website: www.unipower.dk for a thorough description of the parameters and their function. Load monitor APM382 contains two independent load monitors - each with its own dedicated output. The settings for each limit are as follows: Limit : Off, Min or Max Setpoint : 5 - 99 % (Of the measurement range) Tr : 0,01 - 999,9 s Auto Reset : On or Off Hysteresis : 2 - 50 % (If Auto Reset is enabled) Both limits may be set independently of each other and run completely seperately. In addition to the two limits it is possible to activate a dP/dt supervision. This however does not have its own output, but shares Out1 with Limit 1. Setup of the dP/dt limit consists of setting the following parameters: Limit : Off, +dP/dt or dP/dt Setpoint : 2 - 99 % dU/dt : Off, 1 - 20 % (Of nominal voltage) Example with frequency inverter For a more detailed description of the dP/dt supervision and its use, please refer to the above-mentioned technical description. Installation The APM382 is connected to the mains and load as shown in the drawing above. The example is shown where a frequency inverter is used. If this Digital Input Filter is not the case, L1, L2 and L3 are connected directly to the mains. The three motor cables are lead through the tubes mounted in the unit. Each tube is encircled by a special CT capable of measuring currents linearly up to 130A. The CTs can withstand start-up currents up to 500A. For correct measurement the live wires must be lead through the correct tube as shown in the drawing. The direction of the current is not important but must be the same for all three phases. Figure 2 Analogue filter Figure 1 Digital input Measurement Range Setting up the measurement range in the APM382 is done choosing Digital output nominal current and voltage. Based on this the power range may be calculated according to: P = 3 * U * I Range All setpoints are enterred in % of the measurement range and the analogue outputs are also directly proportional to it as well 20mA (10V) corresponds to a measurement of P kW. Range Setup All parameters in the APM382 are setup using a PC with the software 382Mon. (See users guide about how to install and use 382Mon). The basic setup of APM382 consists of the parameters: Timer range : 100s or 1000s (2 decimals or 1) Start timer (Ts) : 0,01 - 999,9s Iout : 0-20mA or 4-20mA (0-10V or 2-10V) Figure 3 Ex. with digital outputs connected to external relays Unipower APM382