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Key Technical Specifications
- Amplitude Range: 0 to 16 g pk
- Frequency Response: 0–60 Hz (0–3600 rpm)
- Operating Temperature: -40 ℃ to +70 ℃
- Output Contact: SPDT (Single Pole Double Throw)
- Hazardous Area Rating: IECX (5550G models)
- Enclosure Material: Copper-free cast aluminum
- Enclosure Rating: NEMA 4 (Standard), NEMA 4X (Optional)
- Mounting Style: 4-hole rectangular pattern
- Reset Method: Local push-button or remote electronic coil
- Time Delay: Adjustable startup delay
Product Introduction
Metrix 5550 is a mechanical vibration switch designed to protect rotating machinery. It uses a spring-loaded mass to detect dynamic vibration stress and triggers a fast-acting relay when limits are exceeded.This switch provides an economical hardware protection layer for low-to-medium speed equipment. Field data shows it reliably trips within milliseconds when vibration surpasses the adjustable setpoint, preventing catastrophic bearing failures.
Installation & Configuration Guide
Preparation (10 min)
Lock out and tag out the machine. Verify zero energy state. Gather a torque wrench and a digital camera. Take a photo of the existing switch’s DIP switches and jumper settings before touching anything.Removal (5–10 min)
Disconnect the field wiring. Note the wire numbers. Unbolt the 4-hole rectangular mounting base. Inspect the mounting pad for corrosion or flatness issues.Installation (10 min)
Clean the mounting surface. Apply thread-locking compound if specified by OEM. Torque the 4 mounting bolts evenly. Route the shielded cable away from high-voltage VFD lines.Power-On & Test (10 min)
Verify 24 V DC ±10% at the terminal block. Check the green LED for power status. Perform a manual trip test using the local reset plunger. Observe the relay click and the yellow alarm LED.
Troubleshooting Quick Reference
- No Power LED: Check 24 V DC supply at terminals. Verify fuse integrity.
- False Tripping: Lower the setpoint screw angle. Check for loose mounting bolts.
- Fails to Trip: Increase setpoint. Test the SPDT microswitch continuity.
- Remote Reset Fails: Measure coil resistance. Verify remote reset voltage.
- Intermittent Alarm: Inspect cable shielding. Check for moisture in enclosure.
Dimensions, Mounting & Wiring Notes
- Mounting: 4-hole rectangular pattern (multi-size options available)
- Terminals: Internal screw terminals for SPDT relay output
- Wiring Note: Always use shielded cable for remote reset circuits. Ground the shield at the control panel only to prevent ground loops.
- Dimensions: Verify exact H×W×D against the specific sub-model suffix (e.g., 5550-412-060) in the OEM datasheet.
FAQ
Can I swap a 5550 for a 5550G?
Yes, mechanically they are identical. The 5550G carries an IECX rating for IIC gas groups. Verify your hazardous area classification before upgrading.I lost the original setpoint setting. What do I do?
Start at the lowest sensitivity and slowly increase while monitoring baseline vibration. Never guess the setpoint. Document the final position with a photo.Is this switch still manufactured?
No. The 5550 series is discontinued. We supply New Surplus and factory-tested refurbished units. Lead times vary by sub-model.Why does my switch trip during startup?
Startup transients often exceed normal running vibration. Adjust the built-in time delay to ignore the first 5-10 seconds of motor acceleration.Do you test these before shipping?
Yes. Every unit undergoes a 24-hour load test on a dedicated vibration shaker table. A signed test report is included in the box.What is the return policy for refurbished units?
12-month warranty against manufacturing defects. We do not cover damage from incorrect setpoint adjustment or water ingress.Can I use this for early warning?
Not recommended. Mechanical switches are designed for hard shutdown protection. Use a 4-20 mA transmitter (like the ST5484E) for trending and early warnings.
