BK PRECISION 1785B, 86B, 87B, 1788 Instruction 电路图.pdf

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1、 1 Instruction Manual Model 1785B, 1786B, 1787B the third conductor being the ground. The power supply is grounded only when the power-line cord is plugged into an appropriate receptacle. Do not operate your power supply without adequate cabinet ground connection. 9 1.2 Output Checkout The following

2、 procedures check to ensure that the power supply develops its rated outputs and properly responds to operation from the front panel. 1.2.1 Voltage Output Checkout The following steps verify basic voltage functions without load. 1. Turn on the power supply. 2. Enable the outputs. Press key to let th

3、e ON annunciator and the CV annunciator turn on to light. Notice: if the voltage value flash, then the power supply is in Set mode, Set mode means that the VFD display shows the setting output voltage and current. Or the power supply is in Meter mode, Meter mode” means that the VFD display shows the

4、 actual output voltage and current. 3. Check that the front-panel voltmeter properly responds to number keys Set some different voltage values, then wait till the Meter mode to check if the VFD displayed voltage value is the same as the set voltage value, and to check if the VFD displayed current va

5、lue is nearly zero. 4. Ensure that the voltage can be adjusted from zero to the full rated value. 1.2.2 Current Output Checkout The following steps check basic current functions with a short across the power supplys output. 1. Turn on the power supply. 2. Disable the output Press key to ensure that

6、the output is disabled. The ON annunciator is turned off. 3. Connect a short across (+) and (-) output terminals with an insulated test lead. Use a wire size sufficient to handle the maximum current. 4. Enable the output. Press key to ensure that the output is enabled. The ON annunciator is turned o

7、n. 5. Adjust the voltage value to 1.0 volt. Adjust the voltage to 1.0 volt to ensure the power supply is in CC operation mode. The CC annunciator will turn on. 6. Adjust the current value. Set some different voltage values, then wait till the Meter mode to check if the VFD displayed current value is

8、 the same as the set voltage value, and to check if the VFD displayed voltage value is nearly Warning: To satisfy safety requirements, load wires must be heavy enough not to overheat when carrying the maximum short-circuit output current of the power supply. If there is more than one load, then any

9、pair of load wires must be capable of safety carrying the full-rated current of the power supply. Out on/off Out on/off Out on/off 10 zero. 7. Ensure that the current can be adjusted from zero to the full rated value. 8. Turn off the power supply and remove the short wire from the output terminals.

10、1.3 If the Power Supply Does Not Turn On Use the following steps to help solve problems you might encounter when turning on the instrument. If you need more help, refer to chapter 6 for instructions on returning the instrument to the supplier for service. 1. Verify that there is AC power to the powe

11、r supply. First, verify that the power cord is firmly plugged into the power receptacle on the rear panel of the power supply. You should also make sure that the power source you plugged the power supply into is energized. Then, verify that the power supply is turned on. 2. Verify the power-line vol

12、tage setting. The line voltage is set to the proper value for your country (110VAC or 220VAC. Change the voltage setting if its not correct. 3. Verify that the correct power-line fuse is installed. If the fuse was damaged, please see the table below to replace the fuse for your power supply. Fuse De

13、scription Fuse 2.5A T 250V for 220VAC Fuse 5A T 250V for 110VAC 1.4 To Adjust the Carrying Handle To adjust the position, grasp the handle by the sides and pull outward. Then, rotate the handle to the desired position. 11 Bench-top viewing positions Carrying position 1.5 To Rack Mount the Instrument

14、 You can mount the power supply in a standard 19-inch rack cabinet using the IT-E151 rack mount kit. Note: Remove the carrying handle and the two plastic ears before rack-mounting the instrument. To remove the handle, grasp the handle by sides and pull outwards and rotate it to a special position to

15、 let the arrow on the handle and the arrow on the plastic ears be in opposite directions, then pull the handle outward. After removing the handle, you can use a screwdriver to remove the two plastic ears. To rack mount a single instrument, order rack mount kit IT-E151 Side view of rack mounting a si

16、ngle instrument 12 To rack mount two instruments side-by-side, order rack mount kit IT-E151, you neednt to use the front cover panel. Dimension unit (mm) Chapter 2 Specifications 2.1 Specifications Parameter 1785B 1786B 1787B 1788 Voltage 0 18V 0 32V 0 72V 0 32V Current 0 5A 0 3A 01.5A 06A Output Ra

17、tings, ( 0 C - 40 C) LVP 0 19V 0 33V 0 73V 0 33V Voltage 0.01% + 3mV Model 1788 = 0.02% + 5mV Load Regulation, (% of output+offset) Current 0.1% + 2mA Voltage 0.1% + 3mV Line Regulation, (% of output+offset) Current 0.1% + 2mA Voltage 10mV Programming Resolution Current 10mA Voltage 0.05% + 15mV(20V

18、) Model 1788 = 0.05% + 120mV(= 20V) Readback Resolution Current 0.1% + 15mA 13 Voltage 0.05% + 10mV Programming Accuracy, 12months, ( 25 C 5 C) (% of output+offset) Current 0.2% +10mA Voltage 0.05%+15mV(20V), 0.05%+120mV(= 20V) Readback Accuracy 12months, (25 C 5 C) (% of output+offset) Current 0.1%

19、 +15mA Voltage = 1mVrms/3mVp-p Ripple (20Hz 20MHz) Current 5mArms Voltage 0.02%+5mV Temperature Coefficient, (0 C 40 C) (% of output+offset) Current 0.1% +5mA Voltage 0.02%+15mV(20V), 0.02%+120mV(= 20V) Readback Yemperature, Coefficient, (% of output+offset) Current MAX VOLT) Please be well known th

20、at the Max voltage value should be in the range of each type of IT68xx Power supply. Step1. Press key. V-Set Enter Enter Save Recall Enter Menu Enter I-Set 9 9 9 9 0 0 0 0 Note: 1. If the function keys were locked by password, you need to enter the correct password after you press function keys (V-s

21、et, I-set, Save, Recall and Menu), then you can do the settings. 2. If you want to cancel a function operation (V-set, I-set, Save, Recall or Menu), just press key to exit. Esc 17 Step2. Select MAX VOLT by using? and ? key. Step3. Press key. Step4. Change the voltage value by using numeric keys to o

22、r ?and ?key. Step5. Press key. ? Initiating the Output state(INIT OUT) This instruction can initiate the output state when the power supply is powered on. If you select ON, the power supply will initiate the output to OFF state when the power supply is powered on. If you select OFF, the output will

23、remain the same state as last time you turned off the power supply ? Initiating the Output Voltage (INIT VOLT) This instruction can set the initial output voltage. If you select ON, the power supply will initiate the output voltage to 0Volt when the power supply is powered on. If you select OFF, the

24、 output voltage will remain as the same volts as the last time you turned off the power supply ? Setting the Key Sound(KEY SOUND) This instruction can switch on/off the buzzing sound when you press any key, If you select ON, the buzzer will sound when any key was pressed. If you select OFF, the buzz

25、er will not sound when the keys were pressed. ? Setting the Baud Rate(BAUDRATE) This instruction can change the communication baud rate for the power supply, the baud rate range is 4800, 9600, 19200 or 38400? Before the communication, you must make sure that there is same baud rate between the power

26、 supply and the computer. Enter Note: After you setting the maximum voltage value, the output voltage setup should be in the range from 0 volt to maximum voltage. The default maximum voltage is the full voltage range of its model. Note: Default selection is ON and the output state is always OFF stat

27、e. Note: Default setting is ON and the output voltage is 0 volt. Note: Default setting is ON; the buzzer will sound when you press any key. Note: Default baud rate is 4800. Enter 90 18 ? Setting Address (ADDRESS) This instruction can set the communication address for each power supply. The address r

28、ange is from 0 to 254. Before the communication, you must make sure that there is same address between the power supply and the computer. ? Setting password for function keys(KEY LOCK) This instruction can set a password (1 through 4 digits) to lock the function keys operation. After setting the pas

29、sword, all the function keys on the front panel will be locked except the OUT on/off key. You must enter the correct password to unlock them, then you can continue to do the function key operation. If you dont want to lock the function keys, please dont press any number key when you enter the KEY LO

30、CK instruction, just press ENTER key to unlock it. Note: Default address is 0. When the power supply receives a frame instruction from computer, the LINK indicator will light on; it means that the power supply started to communicate with computer. If the power supply hasnt received the signal from c

31、omputer for 3 seconds, the LINK indicator will be turned off and it means that the power supply can not communicate with computer. Note: When shipped from factory, there is no password and function keys are unlocked. The start bit of your desired password shouldnt be 0. 19 Chapter 4 Remote Operation

32、 Mode The DB9 interface connector on the rear panel of the power supply can be transferred to RS-232 interface, the following information will tell you how to use the computer to control the output of the power supply. 4.1 IT-E131 Communication cable The DB9 interface connector on the rear panel of

33、power supply is TTL voltage level; you can use the communication cable (IT-E131) to connect the DB9 interface connector of the power supply and the RS-232 interface connector of computer for the communication. Computer side TTL? RS232 Cable (IT-E131) PS side PCLoad IT-E131 communication cable COMPUT

34、ER INSTRUMENT RX TX IT-E131 ISOLATED COMMUNICATION CABLE TTL(5V)RS232ISOLATION 859666668889942311 IT COMPUTER INSTRUMENT RX TX IT-E131 ISOLATED COMMUNICATION CABLE TTL(5V)RS232ISOLATION 859666668889942311 IT Power supply PC 4.2 Communication setting Before using the remote operation mode, please mak

35、e sure that the baud rate and communication address in power supply are the same as in the computer software, otherwise, the communication will fail, you can change the baud rate and communication address from the front panel or from computer. 1. Address: the range is from 0 to 254, default setting

36、is 0 2. Baud rate: 4800,9600,19200 and 38400 are selectable, default setting is 9600 3. Data bit: 8 bit 4. Stop bit: 1 5. Parity: None Start Bit 8 Data Bits Stop Bit PARITY = NONE Note: It will not work if you connect the DB9 interface connector of the power supply to the RS232 interface connector o

37、f computer directly by a standard RS232 cable. Please use IT-E131 to connect them. 20 4.3 Frame format Frame length is 26 bytes, the format is as follows: Start Address Command 4-25 bytes are information content Check sum Description: 1. Start bit is AAH, occupies a byte. 2. Address range is 0 to FE

38、, occupies a byte. 3. Command occupies a byte. a. 20H-Setting the remote control mode b. 21H-Setting the output ON/OFF state c. 22H-Setting the maximum output voltage d. 23H-Setting the output voltage e. 24H-Setting the output current f. 25H-Setting the communication address g. 26H-Reading the prese

39、nt current/voltage, maximum voltage, setup voltage/current and operation states of the power supply. h. 27H-Enter the calibration mode i. 28H-Reading the calibration mode state j. 29H-Calibrate voltage value. k. 2AH-Sending the actual output voltage to calibration program. l. 2BH-Calibrate current v

40、alue. m. 2CH-Sending the actual output current to calibration program. n. 2DH-Save the calibration data to EEPROM. o. 2EH-Setting calibration information. p. 2FH-Reading calibration information. q. 31H-Reading products model, series number and version information. r. 32H-Restoring the factory defaul

41、t calibration data. s. 37H-Enable the local key. t. 12H- The return information of command operation in power supply. 4. 4th to 25th bytes are information content 5. 26th byte is check sum, the sum of the former 25 bytes. 4.4 Communication protocol 1. Setting the remote control mode (20H) 1st byte S

42、tart bit( AAH ) 2nd byte Address(00XFE) Note: You must change the power supply to remote control mode firstly, then you can control the power supply output by computer. The command for remote control is 20H? If you want to calibrate the power supply, set the calibration information or want to set th

43、e product serial number, you must set the calibration protection mode to OFF state firstly, the command for calibration protection is 27H. When the power supply is in calibration mode, it is not allowed to change the output 21 3rd byte Command ( 20H) 4th byte Operation mode(0 represent front panel o

44、peration mode, 1 represent remote operation mode) 5th to 25th byte System reserve 26th byte Check sum 2. Setting the output state ON/OFF (21H) 1st byte Start bit (AAH ) 2nd byte Address(00XFE) 3rd byte Command (21H) 4th byte Output state(0 is OFF, 1 is ON) 5th to 25th byte System reserve 26th byte C

45、heck sum 3. Setting the maximum output voltage (22H) 1st byte Start bit (AAH ) 2nd byte Address(00XFE) 3rd byte Command (21H) 4th byte The lowest byte of voltage upper limit 5th byte The lower byte of voltage upper limit 6th byte The higher byte of voltage upper limit 7th byte The highest byte of vo

46、ltage upper limit 8th to 25th byte System reserve 26th byte Check sum 4. Setting the output voltage (23H) 1st byte Start bit ( AAH ) 2nd byte Address(00XFE) 3rd byte Command( 23H) 4th byte The byte 0 of output voltage value 5th byte The byte 1 of output voltage value 6th byte The higher byte of outp

47、ut voltage value Note: We use 4 bytes of Hex number to represent a maximum voltage value. For example the maximum voltage is 16.000V, the hex code of 16.000 is 0X00003EB0, so the 4th byte is 0XB0, 5th bye is 0X3E, 6th byte is 0X00, 7th byte is 0X00. Note: You can not control the power supply from the front panel when the power supply is in calibration mode. 22 7th byte The highest byte of output voltage value 8th to 25th byte System reserve 26th byte Check sum 5. Setting the output current (24H) 1st byte Start bit ( AAH ) 2nd byte Address (00XFE) 3rd byte Command( 24H) 4th