1.1 Product introduction
The MS2520PN program control ground resistance tester is a safety regulation performance tester developed by the Company. It is mainly used to measure the resistance of conductors under strong current. The current output of the tester is constant current source output, that is, within the test range of the instrument, the output current does not change with the external load resistance, and the output current is the preset current value.
1.2 Applicable standards
The test circuits provided by this tester meet the Household and Similar Electrical Appliances - Safety Part I General Requirements (GB4706.1), Testing Operational Procedure of Household and Similar Electrical Appliances Safety General Requirements (I) (GB5956), and the national testing standards for household appliances.
In addition to being used as a safety regulation tester, this instrument can also be used as a constant current source and other occasions.
1.3 Applicable standards
GB4706.1, IEC60335-1, UL60335-1 Household and Similar Electrical Appliances - Safety Part I General Requirements;
GB4943,UL60950,IEC60950 Information Technology Equipment Safety;
GB8898,UL60065,IEC60065 Audio, Video and Similar Electronic Apparatus - Safety Requirements;
GB4793.1,IEC61010-1, Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Part I: General Requirements.
1.4 Application fields
1.4.1 Household appliances: TV set, refrigerator, air conditioner, washing machine, bread maker, Xiaochubao water heater, electric water heater, electric blanket, charger, etc.
1.4.2 Instruments: oscilloscope, DC power supply, switching power supply, etc.
1.4.3 Office equipment: computer, printer, fax machine, telephone set, copier, money detector, etc.
1.4.4 Electric apparatus: electric drill, pistol drill, cutting machine, sander, grinding miller, electric welding machine, etc.
1.4.5 Motor: electric rotating machinery, etc.
2 Technical parameters
2.1 Ground resistance
| Name Parameters | MS2520PN |
| Input characteristics | Single-phase 50 Hz 220 V ± 10% |
| Output current test | Rated output :32 A/6 V |
| Output frequency | 50 Hz |
| Output waveform | Sine wave THD.< 5% |
| Current setting range | Range: 0 - 32 (A) resolution 0.1 A accuracy ±5% read value +2 words |
| Resistance setting range | Range: 0 - 500(mΩ) resolution 0.1 mΩ accuracy ±5% read value +2 words |
| Test time | Range: 1 - 999.5 S resolution resolution 0.5 S |
| Test Failure Alarm | Buzzer, indicator |
| Memory patterns | 4 memory modes 1 - 4 |
| LCD display | |
| Working environment | Room temperature: 0 - 40℃ humidity :0 - 70% RH |
Figure 1
2.2 Test interval
Note: * Current accuracy range: AC, within 5 - 32 (A);
* Resistance accuracy range: within 50 - 500(mΩ);
* In order to ensure stability and accuracy, test large resistance with small current and test small resistance with large current
* Due to limited transformer capacity, when the test exceeds 160 mΩ, it can not output 32A, which can be calculated according to the rated output.
3 Other functions
3.1 Safety protection function
a. Shut off and alarm against short circuit.
b. Alarm against out of tolerance
3.2 Memory function
The tester can save the frequently-used ground test mode, to quickly enter the selected mode and start testing.
3.3 Interface function (optional)
a. The tester is equipped with an RS232 computer interface through which you can set the instrument by computer, upload the test data by computer, and save the data or print the immediate result or the daily test results by computer. (you should book to the manufacturer in order to use this function).
b. The tester is equipped with a PLC interface.
3.4 Display
The tester is equipped with LCD character display and backlight display, which is convenient for the operation of Human - Machine Interface.
3.5 Keys
The tester has 8 keys: “MOD”, “I”, “R”, “TIME”, “TEST” key , “RESET” key, “SET” setting key, “ENT” enter key, “▼” DOWN key, “▲” UP key
4 Structure and introduction of instrument panel
4.1 The structural of the panel of the MS2520PN program control ground resistance tester is shown in figure 1 and figure 2:
Figure (1) Schematic Diagram of Front Panel of MS2520PN Program Control Ground Resistance Tester
Figure (2) Schematic Diagram of Rare Panel of MS2520PN Program Control Ground Resistance Teste
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4.2 Instructions of each part of the panel:
(1) Input power switch: Press down the switch to turn on the power supply and key up to turn off the power supply.
(2) “Reset” key: it can be used as the sound reset switch of the switch alarm during testing, as the switch to interrupt the test in the course of the test, and as the switch to exit setting mode during mode setting.
(3) “Start” key: it can be used as a test start switch.
(4) Test rod external control connector: this instrument does not have this function.
(5) “SET” key: pressing this key can select the set item by pressing one button to set the instrument.
(6) “∨” DOWN key: This key can be used as the function key to select the function mode and input the value of each test parameter when setting the mode.
(7) “∧” UP key: This key can be used as the function key to select the function mode and input the value of each test parameter when setting the mode.
(8) “ENT” key: This key can be used as the Enter key to set the result and the select key to select the test items.
(9) “MOD” key: press this key to set save mode
(10) “R” key: press this key to set the upper limit alarm value of resistance.
(11) “I” key: Press this key to set current.
(12) “TIME” key: press this key to set test time.
(13) LCD screen
(14) Indicator of test: press the start key, and this indicator lights up.
(15) Indicator of qualified test: if the test is qualified, this indicator lights up.
(16) Indicator of alarm: this indicator lights up when the resistance exceeds the preset value.
| “17”“18”“19”“20” Two sets of outputs | (17) Measurement terminal (voltage terminal) (19) Measurement terminal (current terminal) | -
Measurement terminal (voltage terminal) (20) Measurement terminal (current terminal) |
(21) PLC interface (note 1)
(22) “232” interface: it is a standard 9 PIND seat (Note 2).
(23) Ground terminal: safety protection ground post.
(24) Input power outlet: standard IEC 320 power outlet; the standard NEMA power plug power supply is acceptable; the socket is equipped with 5A fuse.
5 Instructions for instrument operation settings
5.1 Instructions of setting parameters and related interfaces
5.1.1 Figure 1 shows the interface after starting; press “test” key to enter the test page as shown in Figure 3; press other keys, you can enter the interface as shown in Figure 2.
When the numerical bit (xxx) in the interface is K word, you should first press the UP key, hold the up and down key, the number can jump quickly.
5.1.2 Interface of starting:
| | | | | | | W | E | L | C | O | M | E | | | | | | | |
| | M | i | n | s | h | e | n | g | | I | n | s | t | r | u | m | e | n | t |
Figure 1
| S | -- | 1 | | | | | | | | | | | | x | x | x | . | x | S |
| | x | x | . | x | A | | | | | | | x | x | x | . | x | m | Ω | |
Figure 2
5.2 Instructions of testing and related interfaces
5.2.1 Interface of test:
Press the test key to start the test directly, as follows. It will display test time, output current and test resistance value respectively.
| T | - | 1 | | | | | | | | | | | | x | x | x | . | x | S |
| | x | x | . | x | A | | | | | | | | x | x | x | . | x | m | Ω |
Figure 3
5.2.2 Interface of setting:
Press the “set” in the starting page to enter the “set” page as shown in Figure 4; press “SET”, as shown in Figure 5 cursor; press the UP and DOWN Keys to change the value, as shown in Figure 6; the ground test time is 50 S.
| S | -- | 1 | | | | | | | | | | | | x | x | x | . | x | S |
| | x | x | . | x | A | | | | | | | | x | x | x | . | x | m | Ω |
Figure 4
| S | -- | 1 | | I | R | | | | | | | | | x | x | x | . | x | S |
| | x | x | . | x | A | | | | | | | | x | x | x | . | x | m | Ω |
Figure 5
| S | -- | 1 | | I | R | | | | | | | | | 0 | 5 | 0 | . | 0 | S |
| | x | x | . | x | A | | | | | | | | x | x | x | . | x | m | Ω |
Figure 6
5.2.3 Press the “SET” key again, as shown in figure 7 cursor; press the UP and DOWN keys to change the value, as shown in figure 8; the insulation output voltage value is 20.0 A.
| S | -- | 1 | | I | R | | | | | | | | | 0 | 5 | 0 | . | 0 | S |
| | x | x | . | x | A | | | | | | | | x | x | x | . | x | m | Ω |
Figure 7
| S | -- | 1 | | I | R | | | | | | | | | 0 | 5 | 0 | . | 0 | S |
| | 2 | 0 | . | 0 | A | | | | | | | | x | x | x | . | x | m | Ω |
Figure 8
5.2.4 Press the “SET” key again, as shown in Figure 9 cursor; press the UP and DOWN keys to change the value, as shown in Figure 10; the insulation resistance threshold is 500mΩ
| S | -- | 1 | | I | R | | | | | | | | | 0 | 5 | 0 | . | 0 | S |
| | x | x | . | x | A | | | | | | | | x | x | x | . | x | m | Ω |
Figure 9
| S | -- | 1 | | I | R | | | | | | | | | 0 | 5 | 0 | . | 0 | S |
| | x | x | . | x | A | | | | | | | | 5 | 0 | 0 | . | 0 | m | Ω |
Figure 10
5.2.5 Press the “ENT” key to save the settings and exit, as shown in Figure 27; press the “ENT” key again to enter the interface as shown in Figure 11, and wait for the test.
| S | -- | 1 | | I | R | | | | | | | | | 0 | 5 | 0 | . | 0 | S |
| | 2 | 0 | . | 0 | A | | | | | | | | 5 | 0 | 0 | . | 0 | m | Ω |
Figure 11
6 Safe operation regulation
Please read this paragraph carefully before using this instrument
(1) This instrument must be well grounded.
(2) The operator must be familiar with the usage of this instrument.
(3) Use a workbench made of non-conductive material. No metal shall be used between the operator and the object to be tested.
(4) In the course of the test, it is not allowed to touch the object being tested or any object connected to the object absolutely.
(5) During the testing process, it is not allowed to press the keys unrelated to measurement on the instrument panel at will.
(6) During continuous testing, the instrument must be reset to cut off the output if the wire between the instrument and the tested product is to be reconnected.
(7) If the instrument is found to be working abnormal, press the "reset" key or shut down to suspend the test and restart the test after recovery.
7 Attachments
1. Test clip 1
2. Power cord 1
3. Fuse (5A) 2
4. Instructions of Use 1
5. Product Certificate 1
6. Warranty 1
(Note 1):(21) Instruction of “PLC” Interface
It is a 9PIND terminal block containing the monitoring signal outputs of PROCESSING (in test), PASS( test passed), and FALL (test failure) and the remote-control signal inputs of TEST and RESET. The wiring is as follows:
PROCESSING output signal: between PIN1 and PIN4. (two points are conducted when the signal is available)
PASS output signal: between PIN6 and PIN7. (two points are conducted when the signal is available)
FALL output signal: between PIN8 and PIN9. (two points are conducted when the signal is available)
TEST input signal: between PIN2 and PIN5. (two points are conducted to control)
RESET input signal: between PIN3 and PIN5. (two points are conducted to control)
Note: the 2, 3, and 5 ports of PLC are switch conduction ports. Do not connect them to the ground wire and power supply or other live signals of the control equipment.
(Note 2):(22) “232” interface description
Instrument sends test data:
baud rate 9600 without check bit
01 data head 0x55 11 Data tail 0 xaa
02, 03 working hours 000.0 S - 999.0 S
04, 05, 06 Grounding current 0000.00-0032.00A
07, 08, 09 Grounding resistance 00000.0-00500.0 mΩ
10 Status bit
10.7=0 set, wait state 10.7=1 Test status
10.6=0 ground test normal 10.6=1 Ground test alarm
The computer sends instruction and data format and the instrument passes back instruction and data format
When the upper computer sends the , the instrument passes back the data
01 data head 0x55 03 Data tail 0xaa
02 Instructions just sent
When the upper computer sends the data, the instrument passes back the data
01 data head 0x55 08 data tail 0xaa
02-07 Data just sent
The computer sends the data:
01 data head 0x55 08 data tail 0xaa
02, 03 Test time 0000-9995 (000.5-999.5 S)
04, 05 Ground current 0000-3200 (00.00-32.00 A)
06, 07 Ground resistance 0000-5000(000.0-500.0 mΩ)
The computer sends the
01 data head 0x55 03 Data tail 0xaa
02: 01 Test 02 Reset 03 Determination 04 Online
05 Mode
After sending the "Online" signal, wait for the instrument to post back the data, to determine the model of the instrument and set the parameters
Send “Test” signal to start the instrument test, send “Test” again to start the next test after one test is completed, so cycle
Send “Reset” for instrument reset
Send data to set test current, alarm resistance, test time and other data
Send “Enter”, and the instrument saves the data transmitted by the computer
Send “Mode” to enable one of the four modes saved by the instrument and send back data in current mode
The instrument uploads data in sending mode
01 data head 0x55 09 data tail 0xaa
02, 03 Test time 0000-9995(000.5-999.5 S)
04, 05 Ground current 0000-3200 (00.00-32.00 A)
06, 07 Ground resistance 0000-5000(000.0-500.0 mΩ)
08 Current mode 01= mode 1 02= Mode 2 03= Mode 3 04= Mode 4
Product Tags:
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MS2520PN Program Control Ground Resistance Tester Images
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