Siemens S120 frequency converter maintenance and configuration

Replacement of vulnerable parts: fan and power module

1. Replace CU310-2 fan (order number 6SL3064-1AC00-0AA0)

Step: Power off → Remove CU310 → Press the hooks on both sides of the fan → Pull out the fan forward → Unplug the fan plug → Insert a new fan → Insert into place → Install CU310.

When the internal temperature of CU310 is too high (>65 ℃), the system will issue a "Control Unit Overheating" warning (A30031). If the fan does not turn and the causes of blockage and dust are ruled out, it can be replaced.

2. Replace the PM240-2/PM340 fan

PM240-2 FSA/FSB/FSC: Release the fan lock buckle (FSA one, FSB/FSC two), pull out the fan, unplug the plug, and insert the new fan in reverse.

PM340 FSF: First, remove the screws from the cover plate, remove the cover plate, unplug the plugs of the two fans, remove the fan, install a new fan, and tighten with a torque of 3.0Nm.

The average lifespan of the fan is about 50000 hours. It is recommended to replace it in advance near the end of its lifespan to avoid damage to the power module due to overheating.

3. Replace the Powerblock (Chassis type) of the power module

For the Frame size FX and GX, the power block weighs 70-102kg and requires the use of specialized installation tools (order number 6SL3766-1FA00-0AA0).

Replacement steps: Power off and discharge → Remove all connecting cables (motor, power supply, DRIVE CLiQ, fiber optic) → Remove control interface board → Remove fixing screws → Pull out power block with tools → Push in new power block → Reconnect. Please note that the fiber optic plug has directional markings (U11/U21/U31) and cannot be plugged in incorrectly.

DRIVE CLiQ wiring and equipotential connection

DRIVE CLiQ is Siemens' proprietary internal communication protocol for drivers, based on the 100Mbps Ethernet physical layer. Improper wiring can cause communication interruptions or data errors.

Key rules:

Only Siemens pre installed DRIVE CLiQ cables (such as 6FX2002-1DC00 series) can be used, and regular Ethernet cables cannot be used.

Maximum cable length: ordinary cabinet connection is 100m; when using MOTION-CONNECT 500 cable (drag chain), the maximum length is 100m. However, if MOTION-CONNECT 800PLUS is mixed, the total length calculation formula is: L_MC500+(4/3) * L_MC800PLUS+n * 5 ≤ 100m (n is the number of couplers ≤ 3).

At the wall penetration point of the control cabinet, DRIVE CLiQ wall penetration sleeve (6SL3066-2DA00-0AA0 or M12 type 6FX2003-0DT67) should be used to ensure IP protection level and reduce damage to the shielding layer.

Equipotential connection: For dispersed DRIVE CLiQ nodes (such as SMC30), at least 6mm ² equipotential wires must be used to connect to the central grounding point, otherwise the ground potential difference may damage the communication interface.