Indicators. Max power range The unit is equipped with 5 indicators (LEDs) The unit is constructed for measuring currents which indicate to the user the condition of the up to 80 A. In the table below the recommended unit: maximum ranges for standard supply voltages APM110 Unipower 1. Load. Illuminated when the measurement are shown. crosses 5% of the measurement range. If the 3x380-3x500Vac Technical information current flows the wrong way through the unit the indicator is NOT lit. 2. Ts. Illuminated when the measurement Technical Specifications crosses 5% and is turned off when Ts expires. The internal current sensor is linear up to 130A, Mechanical spec. 3. Max. Illuminated when the Max limit is but the current should be limited to 80A due to Housing exceeded and the Tr timer is started. the maximum cable diameter of 10mm. Upper part: Lexan UL94V-0 4. Min. Illuminated when the Min limit is The built-in current sensor is protected against Lower part: Noryl UL94V-0 exceeded and the Tr timer is started. current peaks of up to 500A Mounting M36 for 35mm DIN rail 5. Relay. Indicates the relay state The LED is Special versions CT dim: Max 10 mm lead-in illuminated when the relay is ON, i.e. during The APM110 can be supplied for single phased 2 Terminals: Max 16 A. Max 2,5 mm normal operation. applications also. A version which measures Protection class When an alarm is active, the relay is OFF and power after a frequency inverter may be IP40 (housing). the Max- or Min- LED is lit showing which limit provided on request. IP20 (connector). was exceeded and tripped. Temperature range -15 - +50 C. Weight: Approx. 300g. Dimensions D 58 x B 70 x H 86 mm. Electrical spec. Supply / Range 3x380 to 3x500Vac Current range Internal max. 0-80 A (Surge: 500A/10sec.) External: N/5 C.T. General Power range Unipower APM110 is a low-cost Max 70 kW using internal current sensor member of the Unipower family. The unit Cos range: 0.2-1 measures power from the formula: Frequency range: 50 / 60 Hz. Consumption: 3VA P = 3 x U x I x Cos Relay spec.: 250 VAC/5A. Control inputs: +8-30Vdc The primary function of the unit lies in the supervision of machinery driven by 3- phase AC-motors. Unipower APM110 integrates a programmable Max. and Min. CE mark to: kW limit detector plus the support functions EN50081-1, EN61000-6-2, EN61010-1 necessary to establish the efficient and compact supervision or control of various types of machinery such as pumps, fans and conveyor belts. Besides the functions Ts, Tr and hystere- sis, the APM110 has a built-in current sen- Fig.4 Typical connection with internal sensor Fig.5 Typical connection with external CT sor that measures currents up to 80A. Page 4 Page 1Overview Measurement range internal sensor Functions Choosing limits The basis of the unit is a specially developed 4- By means of a 3-digit switch Range/Limit a Figure 1 shows a typical AC-motor power Deciding the Max. limit P1 may be done in two quadrant multiplier which together with a measurement range from 0.01kW to 9.99kW may consumption curve (ex. pump) immediately after ways: Theoretically or by measuring the actual precision current sensor makes it possible to use be selected. If a larger range is needed, the power has been applied to the motor. At the load. the unit for measuring loads from 0.01kW to chosen range may be multiplied by 10 by setting bottom of the figure a bar is shown indicating the Theoretically 70kW. For larger loads an external CT must be the switch x10 . Using only the internal current position of the relay (On/Off). The figure also Md = P2 x 60 / 2n, where used. The unit accepts crest factors up to 5 and sensor the maximum range is 70kW (See table shows the meaning of Ts, Tr and hysteresis. Md: Torque where alarm should be given. is therefore applicable for measuring before on page 4). If a larger range is wanted an external Max. Limit P2: Corresponding shaft power. frequency inverters. The built-in limits and timers CT (N/5A) is needed - N being the CTs primary The Max. limit is always the same as the n: Revolutions in rev./min. etc. will be described in the following paragraphs. current. measurement range. P1 = P2 + Po. Po is the idle power of the motor. Measurement range ext. CT Min. Limit Measuring Different from other units in the Unipower family To set up the measurement range when using The Min. limit is set from 20% to 80% of the Choose a range larger than the expected the APM110 is programmed directly in kW. Since an ext. CT, a simple calculation is necessary: measurement range. The limit is set in steps of consumption at the given load. the unit accepts supply voltages from 380Vac to Ex: A measurement range of 100kW is wanted 4% with the switch Min. Limit . By normal shut 1. Measure Vref (0-10Vdc) with a voltage me- 500Vac and measures currents up to 80A directly, with a supply voltage of 3x400V. Choose a CT of down of the motor no alarm is generated (Auto ter and calculate the actual kW value, or the unit is applicable in most of the world without 200A. The winding ratio of a 200/5A CT is 40. shut down). 2. Set Tr Max to 10 sec. Decrease the range special modifications to the supply voltage. The unit must be set to 100kW/40 = 2.5kW for a Ts: Start timer gradually until the Max limit indicator is flashing. The setting up of the unit and its functionality is measurement range of 100kW, i.e: The start timer (Ts) is used for avoiding alarms at Start by decreasing the first digit and end with described in the following. motor start. The Ts delay function is activated after the last digit. Range = Measment range/CT winding ratio the power consumption reaches 5%. When Ts When the actual load is known the Max. limit is expires, limits, hysteresis and Tr become active. set as wanted for the given application. The Min. If the consumption drops below 5%, the supervi- limit is set in % of the Max. limit and may be Max.Hystsband(10%) P % sion is switched off again. determined the same way. Tr: Reaction timer Installation Auto-Reset P=f(t) Tr When a limit is exceeded the corresponding Tr The unit is installed as shown in the schematics is activated. The limit must be exceeded for the Max.limit=100% on p. 4 duration Tr before the relay position is changed Voltage connection to Off. If the measurement drops below the limit The unit automatically adapts to supply voltages before Tr expires the timer is reset. from 3x380Vac to 3x500Vac. The phase order 75% is of no importance, but it is IMPORTANT to Auto Reset, Hysteresis Min.Hystsband(10%) measure the current in the same phase as Figure 1 shows how possible Max. and Min. hys- connected to the units Terminal 1. Pay atten- teresis bands are placed relatively to the limits. Auto-Reset tion to the direction of the current. The hysteresis equals 10% of the range and is 50% Control inputs fixed. Hysteresis is activated when an alarm is The inputs S1, S2, S3 are isolated via opto- generated and the external reset is active (Input couplers and are activated by means of a dc- S1, Auto reset mode) Min.limit voltage of 8-30V. The control voltage may be Manual Reset 25% Auto taken from Terminal 17. The inputs may also be shut Ts An alarm may be reset either by pressing the key Tr down activated from PLC outputs as shown in the Tr Reset or connecting the input S1 to 12V. 5% schematics. Threshold Reference output Alarm blocking t Terminals 23 and 24 supply a voltage of 0-10Vdc Ts blocks alarms during startup blocking of alarms after startup may be done by connecting S2 and/ proportional to the measured power (kW). PowerOn or S3 to 12V. 10Vdc equals the range. RelayOn Note: Terminal 24 is connected to measurement Ex. 1: If a short overload is expected a PLC-out- Gnd formed by 3 pcs. 1Mohm resistors con- put or the like may be used to block alarms for a nected to the phases. I.e. no High Voltage, but given time. Fig. 1 Ex. 2: If only one limit is needed, the other may connecting Terminal 24 to external equipment be blocked using S2 (Max limit) or S3 (Min limit). may result in measurement errors. Page 2 Page 3