APM382

Unipower® APM382 Technical Information Overview Version 1.0 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 Cosϕ * 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 The power measurement is performed by a specially developed circuit which is capable of measuring the waveform of the voltage and current signals on the output of a frequency inverter. The unit contains a 4 step programmable analogue filter and 3 digital filters which may be used to improve accuracy at frequencies down to 10Hz. Voltage measurement The APM382 is suitable for mains voltages from 3x230V to 3x575V. The integrated measurement system is designed for measuring after frequency inverters - i.e. between the frequency inverter and the motor. Hence the APM382 is not powered by the measuring voltage like the majority of the Unipower products, but by a 24Vdc. One of 7 mains voltage ranges is selectable from the front plate. Current measurement The APM382 directly measures up to 80A with internal CTs. To take advantage of the large measurement range, the unit has 10 current ranges making APM382 suitable for nominal currents below 1A and up to 80A. The current range is set by a selector switch on the front plate. Analogue output The APM382 features voltage and current outputs configurable as 020mA (0-10V) or 4-20mA (2-10V). It is not possible to generate 0-10V Mechanical Housing: and 4-20mA simultaneously. 20mA (10V) is generated at nominal current, nominal voltage and cosϕ=1. Selecting an invalid voltage range results in both outputs set to 0mA (0V). Both outputs may be inverted for use in a control loop. Digital inputs The unit is equipped with 6 digital inputs. In the standard version only S1 - S5 are used. All digital inputs are activated (On) when connected to the +12 output (23), or an external +12-24Vdc source. Digital outputs 3 optocoupler outputs (Out1, Out2, Out3) are available for signalling alarms. They are On under normal conditions and Off during alarms. The output function may be inverted but is set common for both outputs. If an invalid voltage range is selected both outputs are set Off. LED indicators The APM382 has 4 LED indicators. The LED marked „Load“ indicates that the 24Vdc is connected. If the measured load is below 3% of the measurement range this LED flashes. The LED marked „Aux“ is used as indicator for the start timer (Ts) as well as a dP/dt-alarm. The LEDs marked „Limit 1“ and „Limit 2“ flash concurrently, if an invalid voltage range is selected, but otherwise indicate the status of the two limits; LED On = Tr active, LED flashing = Alarm. Technical Specifications Lexan UL94V-0 (Top) Noryl UL94V-0 (Bottom) Mounting: M36 for 35 mm DIN rail IP class: Housing IP40. Terminals IP20 Terminals: Max 16A. Max 2,5 mm2 Terminal tight. torque: 7lbs/in, 0.79Nm Use 60/75 copper (CU) wire only Opp. Temp.: -15 to +50 OC surrounding air Weight: 300 g Dimens.: D 58 x W 102 x H 86 mm CE mrk: EN61326-1, EN61010-1 UL certified: UL508, File E350194 Supply: Measurement voltage: Current input: Frequency: Accuracy: Analogue output 1: Analogue output 2: Digital inputs: Digital outputs: Serial port: Electrical 24Vdc ±10%, max 150mA Max. 3x600V (PWM) Nominal 40A 10Hz - 1kHz Class 2% 0(4)-20 mA max 300Ω 0(2)-10V min load 10kΩ 12 - 24V DC Optocoupler, max. 30V/30mA RS232C, 9600 Baud Iout polarity Digital filter Zoom - P1Max Zoom - P1Min Output polarity Auto Shut Down : Normal or inverted : 3, 6 or 10s (Analogue output only) : 10 - 100% (Of the range) : 0 - 90% (Of the range) : Noninverted or inverted : 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 Setpoint Tr Auto Reset Hysteresis : Off, Min or Max : 5 - 99 % (Of the measurement range) : 0,01 - 999,9 s : On or Off : 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 Setpoint dU/dt : Off, +dP/dt or ±dP/dt : 2 - 99 % : 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 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. Digital Input Filter Figure 2 Analogue filter Figure 1 Digital input Measurement Range Setting up the measurement range in the APM382 is done choosing nominal current and voltage. Based on this the power range may be calculated according to: PRange = √3 * U * I 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 PRange kW. Digital output 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