LDSYN-101 3BHE00555R0101 Control Unit Application DCS/PLC System


LDSYN-101 3BHE00555R0101 Below is an illustration depicting the placement of protective components for different types of loads:

  • For 24 V DC loads: Use diodes as protective components.
  • For 230 V AC loads: Utilize varistors or RC filters as protective components.
Category: SKU: LDSYN-101 3BHE00555R0101 Tag:
Whatsapp:+86 15359293870
WeChat:+86 18106937731
Contacts:kelly CHEN


LDSYN-101 3BHE00555R0101 Control Unit Application DCS/PLC System


To protect the contacts of relay outputs, especially when dealing with inductive loads such as relays, contactors, and motors, it’s essential to mitigate voltage transients that occur when these loads are switched off. Here are some LDMUI-001 61320946C recommended practices:

  1. Noise Attenuating Circuits: Equip inductive loads with noise attenuating circuits such as varistors, RC filters (for AC), or diodes (for DC). These components help minimize electromagnetic compatibility (EMC) emissions during switch-off. Installing these components close to the inductive load is crucial to effectively suppress voltage transients.
  2. Location of Protective Components: Install protective components (varistors, diodes, RC filters) as close to the inductive load as possible. Avoid installing them at the I/O terminal block to ensure optimal protection.

LDMUI-001 61320946C Below is an illustration depicting the placement of protective components for different types of loads:

  • For 24 V DC loads: Use diodes as protective components.
  • For 230 V AC loads: Utilize varistors or RC filters as protective components.


LDMUI-001 61320946C Planning the Electrical Installation:

  • The chapter emphasizes the importance of checking the insulation of the assembly and ensuring compatibility with IT (ungrounded) and corner-grounded TN systems.
  • Only qualified electricians should perform the work described in this chapter to prevent injury or death.
  • Before installation, ensure that the drive is disconnected from the input power. If already connected, wait for 5 minutes after disconnecting the input power.


LDMUI-001 61320946C Checking Insulation:

  • Avoid voltage tolerance or insulation resistance tests (e.g., hi-pot or megger) on any part of the drive, as it may damage the drive. The drive undergoes insulation testing at the factory, and there are voltage-limiting circuits inside to protect against excessive testing voltage.
  • Inspect the insulation of the input power cable according to local regulations before connecting it to the drive.
  • When checking the insulation of the motor and motor cable, ensure the motor cable is disconnected from the drive output terminals U2, V2, and W2. Measure the insulation resistance between each phase conductor and the Protective Earth conductor using a measuring voltage of 500 V DC. The insulation resistance of an ABB motor should exceed 100 Mohm, while for other motors, refer to the manufacturer’s instructions. If moisture is suspected inside the motor casing, dry the motor and repeat the measurement.

By following these guidelines, you can effectively protect relay contacts from voltage transients and ensure the safety and reliability of the electrical installation.


Application scope:


Company environment:


1. Your item will be shipped to all countries via EMS, unless one country cannot be shipped via EMS. We will choose DHL, UPS, or FedEx. Please leave us your phone number.
2. We will ship the product to you on the same day or within 1-2 working days after receiving your payment. The shipping time depends on the country/region where you reside, the customs and habits of your country/region, and especially during peak hours.
3. Assuming (assuming) that the item requires payment of tariffs from your country, the buyer is obligated. We are not responsible for any taxes or customs fees in your country/region.


Return Policy:
1. Please contact us before returning the item.
2. The buyer should inform the seller of all returned items within 7 days after receiving the package. We reserve the right to reject any request to inform the seller for more than 7 days.
3. Returned products must have all original packaging and be in good condition.


Response policy:
If you are satisfied with the purchase, please leave us an active response.
2. If you have any questions about the outcome of the transaction or product, please contact us first and we will do our best to satisfy you!
3. Please do not reply with negative feedback before contacting us!


Related models:

1TGE120021R0110 CI854K01 3BSE025961R1
0905-148-6921 CI854AK01 3BSE030220R1
0923-141-6957 UFC760BE141 3BHE004573R0141
9031647921 UFC921A101 3BHE024855R0101
8609-396-7113755 LDGRB-01 3BSE013177R1
P0972SE KUC755AE105 3BHB005243R0105
VE3006 KJ2003X1-BB1 TC-205-02-8M5
991-01-XX-01-00 288865-01 UFC760BE142 3BHE004573R0142
853-049542-173 PPC907BE 3BHE024577R0101
3701/55 289761-01 LDGRB-01 3BSE013177R1
PM864AK01 3BSE018161R1 PR6423/003-030+CON021
5SHY3545L0010 3BHB013088R0001 3BHE009681R0101 GVC750BE101 ICRM-15
CI854K01 3BSE025961R1 AVM234SF132