User manual CONTROL TECHNIQUES 1850A

[. . . ] EF User Guide Mentor II DC Drives 25A to 1850A output Part Number: 0410-0013-14 Issue Number: 14 www. controltechniques. com Safety Information Persons supervising and performing the electrical installation or maintenance of a drive and/or an external Option Unit must be suitably qualified and competent in these duties. They should be given the opportunity to study and if necessary to discuss this User Guide before work is started. The voltages present in the drive and external option units are capable of inflicting a severe electric shock and may be lethal. The Stop function of the drive does not remove dangerous voltages from the terminals of the drive and external Option Unit. [. . . ] Bi The Mentor II is equipped with field control as part of the on-board software. If a motor is being used with an uncontrolled (fixed) field supply, this menu does not apply. Provision is made for programming two selectable values of maximum field current. Further, the lower value of maximum field current can be controlled by a programmable timer so that, when the drive is not running, the field can be switched automatically to economy mode. The resulting field current demand is summed algebraically with the field current feedback to produce a current error which is the input to the field current loop. The output of the field current loop is the firing angle, subject to the front endstop limit. The field current can alternatively be controlled directly by either of the maximum field parameters 06. 08 and 06. 09 via a programmable input or by application software, and there is a facility for direct control of the firing angle, useful for diagnosis. Field current demand is the output of the back-emf voltage loop, subject to programmed maximum and minimum field current values. The voltage loop compares the calculated back-emf value with a programmed set point which is used as factor in determining field current demand. The voltage loop output, and consequently the field current demand, is maximum when the calculated back-emf is less than the setpoint value. When the calculated value exceeds the set point value (at base speed) the voltage loop reduces the field current demand to regulate the calculated back-emf to the set point value. Alternatively, the user may wish not to use the voltage loop, but to enter a current demand directly. In this mode, the value of the back-emf set point should be set to maximum, such that the voltage loop always demands maximum field current. The current demand is then the selected maximum field current parameter. 06. 06 IR compensation 2 RW 0 to 255 Uni 000 A programmable factor used for calculation of the armature IR-drop as correction to measured armature voltage, to allow the back emf to be computed. If 06. 20 = 0: If 06. 20 = 1: ( 03. 08 ) × ( 06. 06 ) 06. 05 = --------------------------------------------2048 ( 04. 02 ) × ( 06. 06 ) 06. 05 = --------------------------------------------2048 Example of setting of 06. 06 Armature voltage = 400V Armature current = 200A Armature resistance = 0. 1 IxR = 20V For a M210 with 200A armature current 03. 08 = 635 units so, 20 × 2048 06. 06 = ------------------------- = 64units 635 06. 01 Back emf RO 0 to 1000 Uni 06. 07 = 380V 06. 07 Back emf set point RW 0 to 1000 Uni +1000 V The calculated motor back emf based on armature voltage minus IR compensation value 2, 06. 05. Feedback to the emf loop in spillover mode. 06. 02 Field current demand RO 0 to 1000 Uni The programmable value of the armature back emf in volts, at which the field begins to weaken. Defined as the voltage at which base speed is reached. 06. 08 Maximum field current 1 RW 0 to 1000 Uni +1000 The current demand from the emf loop, subject to the limits of 06. 08, 06. 09 and 06. 10. 06. 03 Field current feedback RO 0 to 1000 Uni Feedback to the field current loop Programmable value of the maximum current demand of the emf loop. If the field control is to be used in current mode, this parameter would become the current reference of the field control loop, and the back emf set point should normally be set to maximum to prevent spillover occurring; alternatively, if motor overvoltage protection by spillover is required, the back emf set point should be set to maximum armature voltage. 06. 04 Firing angle RO 261 to 1000 Uni 06. 09 Maximum field current 2 RW 0 to 1000 Uni +500 Scaling 06. 04 = 1000 corresponds to fully phased forward Alternative to 06. 08, for use as an economy setting. Refer to 06. 12, 06. 14 and 06. 15. 62 www. controltechniques. com Mentor ll User Guide Issue Number: 14 NOTE N 06. 10 Minimum field current RW 0 to 1000 Uni +500 Mentor II can be used with an Issue (rev) 1 MDA3 card, maximum current 5A. Parameter 06. 11 then has the range 101 to 110 and a field current range from 0. 5A to 5A in steps of 0. 5A. Field control can alternatively be implemented by the FXM5 Field Control Unit (see section 11. 7 Field control unit FXM5 on page 105) for a maximum field current of 20A. The minimum value of current demand, to prevent excessive field weakening, for example with overhauling loads. 06. 12 06. 11 Field current feedback scaling RW 201 to 216 Uni 204 Field economy timeout RW 0 to 255 Uni 030 S Parameter 06. 11 permits the user to apply a scaling factor to the current feedback. current rating is 2A or 8A according to the position of link (jumper) J1. [. . . ] 4 CSA C22. 2 0-M1982 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 EN 61000-4-2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 EN 61000-4-4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 107 EN50082-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . [. . . ]