Overview
Configured for shaft-speed measurement and overspeed trip monitoring in machinery protection systems, the EPRO MMS6350D (MMS6350D Digital Overspeed Protection System) processes differential speed signals and provides an analog output for external monitoring. It covers 0 to 20,000 RPM and supports frequency signals up to 16 kHz.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | MMS6350D |
| Brand | EPRO |
| Manufacturer | Epro (Emerson / Philips) |
| Device Type | Digital Overspeed Protection System / Speed Monitor |
| Operating Temp | -40 deg C to +80 deg C |
| Power Supply | 24 VDC |
| Power Consumption | Not specified in supplied data |
| Speed Range | 0 to 20,000 RPM |
| Frequency Range | 0 to 16 kHz (-3 dB) |
| Accuracy | +/- 0.1% of full scale |
| Resolution | 0.1 RPM |
| Overspeed Trip Delay | 0 to 30 seconds |
| Input Voltage Range | 0 to 30 VDC |
| Input Configuration | Differential input |
| Input Protection | Short-circuit and open-circuit proof |
| Analog Output | 0/4 to 20 mA |
| Display Interface | Digital display integration |
Speed Signal Processing and Protection
The MMS6350D accepts a differential speed input and processes the shaft-speed signal for overspeed monitoring. The specified input range extends from 0 to 30 VDC, while the frequency response reaches 16 kHz at the -3 dB point.
The unit measures speeds from 0 to 20,000 RPM with 0.1 RPM resolution. It also provides +/- 0.1% of full-scale accuracy. The configured overspeed trip delay can range from 0 to 30 seconds.
The 0/4 to 20 mA analog output provides a current signal for external monitoring or control-system interfaces. The input circuit includes short-circuit and open-circuit protection according to the supplied specifications.
Frequently Asked Questions
Q: What type of speed signal does the MMS6350D accept?
A: The MMS6350D uses a differential input with a specified input voltage range of 0 to 30 VDC. It processes frequency signals from 0 to 16 kHz (-3 dB).
Q: What speed range can the MMS6350D monitor?
A: The specified measurement range is 0 to 20,000 RPM, with a resolution of 0.1 RPM.
Q: What analog signal does the MMS6350D provide?
A: The unit provides a 0/4 to 20 mA analog output for external speed monitoring or system interfacing.
Field Installation Guidelines
Install the MMS6350D in accordance with the applicable machinery protection system documentation and cabinet requirements. Verify the 24 VDC supply before connecting field wiring.
Route speed-sensor wiring separately from high-current power conductors and switching circuits to reduce electrical interference. Use appropriate shielded instrumentation cable where required by the installation design.
Connect the differential speed input according to the sensor polarity and terminal assignment specified for the installed system. Check the input circuit for correct voltage levels before commissioning.
Verify the 0/4 to 20 mA output wiring and receiving-device configuration before applying the monitored signal to the control or protection system.
Before operation, confirm the configured speed range, overspeed threshold, and trip delay against the approved machinery protection settings. Perform a functional verification of the speed signal and trip path before placing the monitored equipment into service.
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