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 APM110E Unipower 1. Load. Lit continuously when the measure- are shown. ment exceeds 5% of the range. If the current 3x230-3x575VAC External supply: 1 x 120V / 230VAC flows the wrong way through the unit or is below 5% the indicator is flashing. 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, 3. Max. Illuminated when the Max limit is but the current should be limited to 80A due to Mechanical spec. exceeded and the Tr timer is started. the maximum cable diameter of 10mm. Housing 4. Min. Illuminated when the Min limit is The built-in current sensor is protected against Upper part: Lexan UL94V-0 exceeded and the Tr timer is started. current peaks of up to 500A Lower part: Noryl UL94V-0 5. Relay. Indicates the relay state The LED is Mounting M36 for 35mm DIN rail illuminated when the relay is ON, i.e. during Supply voltage CT dim: Max 10 mm lead-in normal operation. The unit needs separate supply voltage Terminals When an alarm is active, the relay is OFF and 1x120Vac or 1x230Vac. Connect 1x120Vac 2 Max 16 A. Max 2,5 mm the Max- or Min- LED is flashing showing which between terminals 9 and 11, or 1x230Vac Use 60/75 copper (CU) wire only limit was exceeded and tripped. between terminals 7 and 11. Terminal tight torque: 7lbs/in, 0,79Nm Protection class IP40 (housing). IP20 (connector). Temperature range -15 - +50 C. Weight: Approx. 300g. Dimensions D 58 x B 70 x H 86 mm. Electrical spec. General Supply 1x120VAC or 1x230VAC 10% Unipower APM110 is a low-cost Voltage Range member of the Unipower family. The unit 3x230 to 3x575VAC measures power from the formula: Current range P = 3 x U x I x Cos Internal max. 0-80 A, Ext. N/5A C.T. Power range The primary function of the unit lies in the Max 80 kW using internal current sensor supervision of machinery driven by 3- Cos range: 0.2-1 Frequency range: 50 / 60 Hz. phase AC-motors. Unipower APM110 Consumption: 3VA integrates a programmable Max. and Min. Relay spec.: 250 VAC/5A. kW limit detector plus the support functions Control inputs necessary to establish the efficient and +8-30VDC Galvanic isolated compact supervision or control of various Reference output types of machinery such as pumps, fans 0-10VDC, for test only and conveyor belts. Ext. DSP output: 10V/50mA max Besides the functions Ts, Tr and hystere- sis, the APM110 has a built-in current sen- CE mark to: EN61326/A2, EN61010-1 sor that measures currents up to 80A. UL certified: Fig.4 Typical connection with internal sensor Fig.5 Typical connection with external CT Option: External display via 2-wire con- UL508, File E194022 nection. Page 4 Page 1Overview Functions Choosing limits The basis of the unit is a specially developed 4- Measurement range internal sensor Figure 1 shows a typical AC-motor power Deciding the Max. limit P1 may be done in two quadrant multiplier which together with a By means of a 3-digit switch Range/Limit a consumption curve (ex. pump) immediately after ways: Theoretically or by measuring the actual precision current sensor makes it possible to use measurement range from 0.01kW to 9.99kW may power has been applied to the motor. At the load. the unit for measuring loads from 0.01kW to be selected. If a larger range is needed, the bottom of the figure a bar is shown indicating the Theoretically 80kW. For larger loads an external CT must be chosen range may be multiplied by 10 by setting 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 the switch x10 . Using only the internal current shows the meaning of Ts, Tr and hysteresis. Md: Torque where alarm should be given. is therefore applicable for measuring before sensor the maximum range is 80kW (See table Max. Limit P2: Corresponding shaft power. frequency inverters. The built-in limits and timers on page 4). If a larger range is wanted an external The Max. limit is always the same as the n: Revolutions in rev./min. etc. will be described in the following paragraphs. CT (N/5A) is needed - N being the CTs primary measurement range. P1 = P2 + Po. Po is the idle power of the motor. current. Min. Limit Measuring Different from other units in the Unipower family Measurement range ext. CT 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 To set up the measurement range when using measurement range. The limit is set in steps of consumption at the given load. the unit is externally supplied with 1x120Vac or an ext. CT, a simple calculation is necessary: 4% with the switch Min. Limit . By normal shut 1. Measure Vref (0-10Vdc) with a voltage me- 1x230Vac and measures voltages from 230Vac Ex: A measurement range of 100kW is wanted down of the motor no alarm is generated (Auto ter and calculate the actual kW value, or to 575Vac and currents up to 80A directly, the with a measurement voltage of 3x400V. Choose shut down). 2. Set Tr Max to 10 sec. Decrease the range unit is applicable in most of the world without a CT of 200A. The winding ratio of a 200/5A CT Ts: Start timer gradually until the Max limit indicator is flashing. special modifications. is 40. The unit must be set to 100kW/40 = 2.5kW The start timer (Ts) is used for avoiding alarms at Start by decreasing the first digit and end with The setting up of the unit and its functionality is for a measurement range of 100kW, i.e: motor start. The Ts delay function is activated after the last digit. described in the following. the power consumption reaches 5%. When Ts When the actual load is known the Max. limit is Range = Measment range/CT winding ratio 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 measurement before Tr expires the timer is reset. voltages from 3x230Vac to 3x575Vac. The 75% phase order is of no importance, but it is Auto Reset, Hysteresis Min.Hystsband(10%) IMPORTANT to measure the current in the Figure 1 shows how possible Max. and Min. hys- same phase as connected to the units Termi- teresis bands are placed relatively to the limits. Auto-Reset nal 1. Pay attention 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 (Min limit) or S3 (Max limit). may result in measurement errors. Page 2 Page 3