1. Unboxing and Basic Familiarization with the Equipment

1.1 Key Technical Specifications

1.2 Unboxing Inspection and Verification of Accessories

1.2.1 Unpacking and Visual Inspection

When unpacking the device, handle it gently to avoid scratching the casing with sharp tools. After unpacking, first inspect the exterior of the device to ensure there is no obvious deformation or dents, and that the buttons are not damaged or loose.

If you notice any damage or deformation to the equipment or accessories, do not turn on the power. Please contact us immediately.

1.2.2 Main Unit and Accessories

Main Equipment: 1 Voltage Dips and Interruptions Generator.

The CSS61000-11 single-phase EUT device looks as follows:

Figure 1

The CSS61000-11T three-phase EUT device looks as follows:

Figure 2

Standard Accessories: ① Equipment power cord; ② EUT (test specimen) input power supply cord; ③ EUT output connection cable; ④ Coaxial cable, which can be connected to an external oscilloscope to view waveforms; ⑤ Ground wire.

Figure 3

Download links for the digital user manual, warranty card, and other documents have been sent to you via email. Please download them as soon as possible. If you missed the email, please feel free to contact us to request the download links again.

2. Safety Precautions

2.1 Placement Guidelines

Ensure the ambient temperature is between 15°C and 35°C, relative humidity between 30% and 60% (no condensation), and atmospheric pressure between 86 kPa and 106 kPa to prevent high-voltage short circuits or damage to the equipment caused by moisture;

The premises must be free of strong electromagnetic interference, corrosive gases, flammable or explosive materials, and dust, and must be well-ventilated;

Place it on a stable workbench; avoid tilting or inverting it, and keep it away from sources of vibration;

The equipment must be placed at least 1000 mm away from walls and surrounding structures (such as other testing equipment and shelving) to facilitate maintenance; at least 2000 mm of space must be left in front of the equipment to ensure smooth operation and keep the surrounding area free of obstructions.

2.2 Electrical Safety Standards

2.2.1 Security Check

Verify that the equipment’s power supply voltage matches the supply voltage, and ensure that the power supply is properly grounded and that the grounding wire is free of damage or looseness.

Grounding Requirements: The protective grounding terminal (PG) on the main unit must be connected to ground, with a grounding resistance of ≤4 Ω.

The EUT’s ground terminal must be at the same potential as the equipment’s grounding system to ensure test safety.

2.2.2 Safety Requirements for Operational Procedures

Operators must undergo professional training and be familiar with this manual and the relevant standards. Non-professionals are prohibited from operating or disassembling the equipment. The equipment contains high-voltage circuits; opening the cover may pose an electric shock hazard. Contact the manufacturer’s technical staff for repairs.

While the equipment is in operation, do not touch the EUT’s input and output wires or terminals.

Before switching connections or replacing the EUT, you must first ensure that the EUT’s power input and output switches are turned off.

When multiple people are involved, clearly define roles and responsibilities, and confirm them with each other before starting the test to avoid errors.

2.3 Other

For matters not covered in this manual, please proceed with caution or contact us.

3. Preparations Before the Test

3.1 Preparation of the EUT (Test Item)

Inspect the EUT to ensure there are no visible damages, no water ingress, and no rust, and that the power connector is intact.

Prepare an external power supply based on the EUT’s rated voltage and current.

3.2 Verification of Standard Parameters

3.2.1 Single-Phase Test Parameters (GB/T 17626.11)

3.2.2 Three-Phase Test Parameters (GB/T 17626.34)

Drop Type: Single-phase drop, two-phase drop, three-phase drop (select according to test requirements).

Synchronization Requirements: During a three-phase drop, the initial phase difference between phases must be ≤5°, and the duration deviation must be ≤1 ms.

Recovery Requirements: After the drop ends, the voltage recovery time must be ≤ 10 ms, with no overshoot (overshoot voltage ≤ 110% UT).

3.3 Introduction to the Equipment Front Panel and Wiring

① Emergency stop switch; ② USB port, which can be used to connect a mouse or update the software; ③ The remaining three ports are reserved; if not specified at the time of purchase, they have no function;④ Touchscreen; ⑤ EUT power indicator and test indicator; ⑥ Power switch; ⑦ EUT rated voltage display; ⑧ Voltmeter displaying the EUT voltage drop; ⑨ Voltmeter displaying the EUT current voltage; ⑩ Ammeter displaying the EUT current;⑪ Connects to the EUT; ⑫ Connects to the EUT; ⑬ Connects to an external oscilloscope to view the voltage drop waveform; ⑭ Power cord; connect as specified in 2.2.1;⑮ EUT power input terminal; connect to an external power source to supply power to the EUT; ⑯ EUT power input switch; ⑰ EUT connection port; ⑱ EUT power output switch; ⑲ PG protective grounding terminal; connect as specified in 2.2.1; ⑳ EUT test specimen.

Figure 4

Note: Based on the EUT’s maximum current and for ease of wiring, simply select one of ports ⑪, ⑫, or ⑰ for connection.

3.4 Equipment Warm-up and Self-Test

Turn on the power switch on the front panel of the host; the device enters standby mode, the power indicator light turns on, and the cooling fan starts.

Wait 5 minutes for the device to warm up, and check that the touchscreen is displaying normally and that there are no error messages.

4. Introduction to the Touchscreen Program

4.1 Initial Screen

① General Precautions for Use (This feature is still under development; there is no need to access it at this time); ② Switch between Chinese and English; ③ System Information Screen; ④ Voltage and Frequency Dip Test Screen.

Figure 5

4.2 System Information Screen

① Switch the voltage drop mode to perform the voltage drop based on either the rated voltage or the actual voltage. Example: If the rated voltage is 220 V, the actual voltage is 230 V, and the set voltage drop is 160 V, the voltage drop will be 160 V if calculated based on the rated voltage; If the voltage drop is calculated based on the actual voltage, the drop voltage will be 230/(220/160) = 167.3 V.
② Click to view the test log.

Figure 6

4.3 Test Interface

① Voltage waveform display; ② Display of the EUT’s actual voltage and voltage dip; ③ EUT frequency display;④ Special function settings; ⑤ For three-phase EUTs, test parameters can be set separately for each phase (La, Lb, Lc); ⑥ Control whether to perform a voltage dip test on a specific phase; if a dip test is not required for that phase, simply set it to OFF;⑦ Rated voltage setting; ⑧ Voltage dip setting; ⑨ Voltage dip duration setting; ⑩ Interval duration setting; ⑪ Voltage dip phase angle setting; ⑫ Number of voltage dips setting; ⑬ Click to turn the EUT power on or off.

Figure 7

Note 1: For the CSS61000-11 single-phase EUT Voltage Dips and Interruptions Generator, after turning on the EUT input/output switch and setting the rated voltage, the generator will automatically adjust the EUT input power supply to the set rated voltage value based on the setting. The CSS61000-11T three-phase EUT Voltage Dips and Interruptions Generator does not have an automatic rated voltage adjustment function; if you need to adjust the EUT input voltage, you must adjust the external input power supply.

Note 2: If all drop tests are to be conducted at a fixed phase angle: If your EUT sample operates at 50 Hz, set both the drop time and the interval time to be integer multiples of a single cycle (20 ms). If your EUT sample operates at 60 Hz, set both the drop time and the interval time to be integer multiples of a single cycle (16.67 ms). If the set times are not integer multiples of a single cycle, only the first dip may occur at the set phase angle.

Click to enter the special features settings screen (you may choose to enable or disable this feature; it does not affect the test).① Return to the General Settings screen; ② Automatically configure settings according to the electricity meter industry standard; each drop test consists of 3 consecutive drops (spaced 50 ms apart); ③ If your device uses a three-phase circuit for drop testing, click to have Lb and Lc automatically use the settings for La.

Figure 8

5. Voltage and Frequency Dip Test

5.1 Operational Procedures

Turn on the EUT input power supply switch, and turn on the EUT power output switch.

Figure 9

After setting all parameters on the touchscreen interface, the screen displays “Voltage Adjusting.” Observe the rated voltage and voltage dip displays on the screen, as well as the voltmeter reading. When the rated voltage (applicable only to the CSS61000-11 Single-Phase EUT Voltage Dips and Interruptions Generator) and the voltage dip are automatically adjusted to the set values, the prompt disappears.

Figure 10

Note: When the above message appears, it indicates that the device is in the process of self-calibration; do not perform any other operations.

Click “EUT POWER” to connect the EUT power supply to the EUT. Follow the instructions in the EUT manual to set it to its normal operating state (e.g., power on and warm up, set the operating mode).

Figure 11

Click “START” to begin the voltage dip test.

Figure 12

The current voltage and current of the EUT can be monitored, and the display can be switched between the rated values and the test values.

Figure 13

Figure 14

Note: The CSS61000-11 series testers are capable of testing high-power EUTs; the selected current meter is a wide-range current meter. If the EUT current is relatively low, the display may not be clearly visible, but this does not affect the test.

5.2 Determining Whether the EUT Has Passed the Test

The four-level performance classification system (A/B/C/D) specified in GB/T 17626.1 (General Principles for Immunity Testing) is adopted.

GB/T 17626.11-2023 (Equipment ≤ 16 A) Preferred test level:

GB/T 17626.34-2012 (Equipment >16A) Preferred Test Level:

6. Post-Test Procedures

6.1 Emergency Stop Procedure

6.1.1 Conditions for Triggering an Emergency Stop

The EUT presents serious safety hazards, such as smoke, fire, or explosion.

The equipment exhibits abnormal noises, odors, or overheating (casing temperature exceeds 60°C).

Loose terminal connections and short circuits caused the equipment to trip.

6.1.2 Emergency Response Procedures

Immediately press the emergency stop switch (red; rotate clockwise to reset), and all power to the equipment will be cut off.

If the EUT catches fire, use a dry-powder fire extinguisher to put out the fire (never use water).

Once the equipment has cooled down, check for the cause of the malfunction (e.g., wiring, parameters, EUT status).

After troubleshooting, turn the “Emergency Stop” button to reset it, and restart the equipment following the normal wiring and startup procedures.

6.2 Procedure for Concluding a Normal Test

6.2.1 Testing Complete

The test is complete, and the device has entered standby mode.

6.2.2 Power Disconnection and Disconnection of Wires from the EUT

Turn off the EUT in the following order: Click “EUT POWER” to cut off power to the EUT, turn off the EUT power output switch, and turn off the EUT power input switch.

Replace the EUT for testing, or turn off the device’s power.

6.3 Post-Test Cleanup and Organization

Clean the test area and wipe it down with a dry cloth. Do not use alcohol or corrosive cleaning agents.

6.4 Equipment Storage

6.4.1 Short-Term Storage Requirements

If the equipment is used on a daily basis, no further action is required after cleaning is completed following each test.

6.4.2 Requirements for Long-Term Storage

If the device will not be used for an extended period (more than one month), please disconnect all cables and cover the device with a dust cover to prevent dust buildup.

The device should be powered on once a month for just half an hour to prevent the aging of electrical components (such as capacitors and contactors).

7. Troubleshooting and Resolving Common Problems

7.1 Symptom: The device does not respond after power-on (the indicator light does not come on, and the fan does not spin)

Possible causes: The power cord is not properly connected or is damaged; abnormal supply voltage; a blown fuse; a blown varistor (MOV).

Troubleshooting: Ensure the power cord is intact and securely connected. Power supply issues—such as unstable voltage, excessively high voltage, or harmonic interference—can cause the fuse or varistor to burn out. We recommend using a voltage-stabilized, pure sine wave AC power supply to power the device. Replace the fuse or varistor with one of the same type.

The figure below shows the location of the fuse:

Figure 39

The figure below shows the location of the varistor (MOV) inside the filtered power supply:

Figure 40

7.2 Symptom: The circuit breaker trips immediately after startup

Possible causes: Short circuit in the EUT; short circuit between the EUT input and output conductors

Troubleshooting: Check whether the EUT’s input/output wires are exposed or shorted, and replace any damaged cables; check whether the EUT is shorted (measure the resistance at the EUT’s power input terminals with a multimeter); after resolving the EUT fault, try again.

7.3 Symptoms: The “(START) Start Test” button cannot be activated

Possible causes: The voltage has not been adjusted properly; the EUT has not been powered on.

Solution: Wait 3 to 5 seconds to allow the device to automatically adjust the voltage to the set value (wait until the Vr and Vd readings stabilize); click the “EUT Power” button to power on the EUT, then try again.