Digital Overspeed Protection System with PROFIBUS -DP 振动保护模块

● Systems DOPS and DOPS AS SIL3-

certified

● PROFIBUS-DP Interface: (optional)

● Microcontroller based 3-channel

measuring system

● High safety level due to password

protection at each of the monitors

● Up to 6 limit values per channel

● Two current outputs per channel with

zoom and dual current function, one

of them electrically isolated

● Mutual comparison of pulses and

output signals between all channels

● Redundant power supplies for

monitors and backplane

● Self-test functions for electronic

circuits and sensors

● Simplified fault detection by display

messages in plaintext

● Electrical isolation of binary input and

output signals

● Wiring by means of preformed cables

and converters in the control cubicle

● RS 232 interface for input of

parameters

● RS 485 interface for data exchange

with the host computer

● Hot swap of boards during operation

The speed measurement and

overspeed protection systems

DOPS and DOPS AS serve the

measurement of speeds and the

protection of inadmissible

overspeeds at rotating machines.

The DOPS systems in combination

with safety shut-off valves

are suitable to replace older

mechanical overspeed protection

systems.

With the consistent three channel

design, starting with the signal

detection via signal processing up

to the evaluation of the measured

speed, the system offers the

maximum safety for the machines

to be monitored.

Safety relevant limit values (e.g.

overspeed limits) are submitted to

the post-connected fail-safe

technique.

Thus it can be ensured that beside

operational safety, the protection

function on a high level standard is

met as well.

The integrated peak value memory

permits reading out the maximum

speed value that has occurred

before the machine was switched

off. This function provides important

information for evaluating the

mechanical machine load caused

by the overspeed.

Alarm outputs and error

messages are output as potentialfree

relay outputs and as shortcircuit

proof +24 V voltage outputs.

The alarm outputs, combined in 2

out of 3 logic, are also available as

potential free relay contacts.

The system includes an extended

fault detection function. The three

speed sensors are continuously

checked on operating within the

permitted limits.

Moreover, the channels mutually

check and supervise the output

signals of each other. If the internal

fault detection circuit detects an error,

this will be indicated via the output

contacts and shown on the display as

plaintext.

By means of the the PROFIBUS DP

interface the recorded data can be

passed on to host computers.

By using prefabricated connection

cables and screw terminals, the

systems may be integrated

economically in 19“ cabinets.

For the measurement of speed and

for the protection from overspeeds,

epro offers three system variants.

System DOPS

This system offers a maximum in

functionality and is certified

according to SIL3 – DIN EN 61508

in combination with epro MMS

eddy current measuring chains. It

requires the following components:

- 3 x monitor MMS 6350 (/DP)

(incl. firmware applic. no. 0)

Profibus-interface (optional)

or alternatively

- 3 x monitor MMS 6350D (/DP)

(incl. firmware applic. no. 0)

with speed display

Profibus-interface (optional)

In addition:

- 1 x Backplane MMS 6351/00

- 1 x 19“ frame MMS 6352

- 6 x screw terminals MMS 6361

- 6 x cable 0.5 m MMS 6362

alternatively

cable 3 m MMS 6360

- 1 configuration kit MMS 6950

- 3 x blind plate BLE 008, for the

installation of monitors without

display

When using this system line, there

are additional combinations

available via relay outputs beside

the normal outputs of the alarms

OUT1....OUT6 and the system

supervision Channel Clear:

2 v 3 combination output OUT1

2 v 3 combination output OUT2

2 v 3 combination output OUT3

2 v 3 combination Channel Clear

System DOPS AS

This system offers a special

functionality for Astom applications

and is certified according to SIL3 –

DIN EN 61508 in combination with

epro MMS eddy-current measuring

chains. This system line requires

the following components:

- 3 x monitor MMS 6350 (/DP)

(incl. firmware appl. no. 2)

Profibus interface: (optional)

alternatively

- 3 x monitor MMS 6350D (/DP)

(incl. firmware appl. no. 2)

with speed display

Profibus interface (optional)

In addition: