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Frequency Generator When it comes to track guidance of driverless vehicles, inductive systems are the most reliable. In order to fulfil the demands of various applications, many generators have been developed. The frequency generator HG 57500YD generates an AC current in a conductive loop for track guiding Automated Guided Vehicles (AGV). The board in Eurocard format hosts two independent generators with power amplifiers and a transformer for dc-decoupling. Its frequencies are stored in an internal EPROM and may be selected using either the 16 position HEX switch or an external controller (i.e. PLC). The generator has minimal power dissipation and a high efficiency factor due to its Class-D power amplifier. Dimensions HG 57500YD Both loop currents undergo voltaic conversion through a different transformer, are therefore separately adjustable and are set to give a constant output level. Short circuit and circuit breaks will be detected and indicated by the LEDs on the front panel. The generator HG 575 is compact and cleanly built. It was constructed to be particularly easy to service. Contrary to its extensive performance, the frequency generator HG 575 definitely has an extremely low price which conforms to the “Low cost“ AGV concept. Reading Antenna Interpreter Generator HG 57500 Route cable Sketch Induktive Guidance Systeme with Frequency Generator LED Meaning 24V Shows operating voltage Z<Zmin Short circuit or load impedance too low (Generator 1 / 2) O.K. Correct / Precise load impedance Z>Zmax Breach of wire or load impedance too high (Generator 1 / 2) F1, F2 Frequency Selection Strom 1, 2 Loop Current Adjustment Mon. 1, 2 Test sockets for loop current adjustment (Generator 1 / 2) Frequencies Freq.-Sel.-Inputs Switch Frequency [Hz] The frequencies shown below are set as standard into the device. Others can be preset on request. F8 F4 F2 F1 0 0 0 0 0 1 1 0 0 0 1 5000 2 0 0 1 0 5100 3 0 0 1 1 5200 4 0 1 0 0 5700 5 0 1 0 1 6000 6 0 1 1 0 6300 7 0 1 1 1 6500 8 1 0 0 0 7000 9 1 0 0 1 7500 16 frequencies are pre-programmed into the device and saved on the EPROM. Any of these 16 frequencies may be directly accessed by using the hex selector on the front of the device. It is also possible to select a frequency using the device interface. In order to adjust the frequency by frequency- select- inputs, the rotary switch for the corresponding generator has to be set to zero. The levels for these inputs are defined as follows: (the input impedance is approx.10 kOhm): A 1 0 1 0 7800 - log. Zero 0 to 0.8 Volt or open B 1 0 1 1 8000 - log. One 5 to 24 Volt C 1 1 0 0 8500 Synchronization D 1 1 0 1 9000 E 1 1 1 0 9500 F 1 1 1 1 10000 If both generators on one card are set to the same frequency then the frequencies are generated synchronously and in phase. Loop current long/short [mA] 30/60 Magnetic field The frequency generator HG 575 has two independent and freely selectable channels. Each channel offers a range of settings from 5 to 10 kHz in steps of 1Hz. Dimensions and LEDs Frequency Generator HG 57500YD Loop Current and Impedance - Long loop Impedance 3 to 100 Ohm Short Circuit or Loop Breakage - Short loop Impedance 1 to 30 Ohm Low load impedances are indicated by the red LED „Z< Zmin. Contact resistances in terminal boxes add to the overall impedance in such a way that short circuits within the application may not be detected. High load impedances will be detected as an interruption and are indicated by the red LED „Z>Zmax“. Within the normal load range the green LED shows „O.K.“. The detection area depends on the outputs selected as well as on the current adjusted. In short loops the loop current may be up to 60 mAeff. For long loops the maximum current amounts to 30 mAeff. The distinction between long and short loops does not refer to the actual length but to the selected connectors. For loop currents up to 30 mAeff loops of any length up to an impedance of 100 Ohm can be connected to the outputs „Loop closure long“ and „Loop start“. For currents higher than 30 mAeff the outputs „Loop closure short“ and „Loop start“ are to be used. In this case the maximum impedance for a current of 60 mAeff is 30 Ohm. For load impedances higher than 100 Ohm the inductive reactive component can be balanced by a capacitor which has to be assembled on the board. In this case the loop must be connected to the output „loop closure long balanced“. The capacity of the capacitor has to be determined separately for each application. Loop Current Adjustment An AC voltage measuring unit is to be connected to each test socket on the front panel. This measures the voltage drop of the conductor current over a 1 Ohm resistance. Therefore the device has to have an AC range from 0 to 60 mV for currents to be set from 0 to 60 mA and a frequency range higher than 10 kHz. The current can be adjusted separately at the corresponding spindle potentiometer for each generator with a small screw driver. Load impedance range and preset power output for connections to the loop closure: LED Color Short (I = 30 mA) Long (I = 60 mA) LED Z<Zmin Red — 1 to 3 Ohm LED O.K. Green 1 to 30 Ohm 3 to 100 Ohm LED Z>Zmax Red > 30 Ohm > 100 Ohm Load Impedance Ranges For a correct detection of loop breakage and short circuit the actual current to be adjusted as well as the scale of the impedance should be known in order to set the generator accordingly. Stacking in Variant HG 57500RD Version HG 57500RD is capable of stacking: Both generators on a card can be connected in series. Precondition is, that both generators use the same frequency. With stacking a loop can be supplied with double impedance. Technische Daten - Dimensions Eurocard, 30.48mm - Connector DIN 41612, C 32 pin, AC supply - Power source 24 V ±10 % - Power consumption Less than 0.3 A, using both channels - Load Impedance 3 to 100 Ohm at 30 mA with large loop 1 to 30 Ohm at 60 mA with small loop - Output current max. 30 mA with large loop max. 60 mA with small loop Others variants than 30/60 mA available on request - Operating temperature 0 to 50o C - Output frequencies Selectable from 5 to 10 kHz - Resolution 1 Hz - Frequency accuracy Quartz stabilised to better than 0.02 % - Adjustment options Either with the rotating switch or an external input (Frequency choices preset in EPROM) Date: 15.11.2011 English, Rev. 02 Author(s): RAD/SIS