VIBRO-METER CPU controller CPUM 200-595-070-321



VIBRO-METER  CPU controller  CPUM 200-595-070-321

Power supply labelling

Information regarding the DC and AC inputs for the RPS1U power supply used by the VM600

slimline rack (ABE056) is available on labels on the top and rear of the rack (see Figure2-35)

System elements

In order to gain an understanding of the operation of a VM600 machinery protection system

(MPS), it is necessary to consider the interaction of the principal elements making up this

system, namely:

1-ABE04x (19"x6U) rack or ABE056 (19"x1U) rack

2-RPS6U rack power supply

3-MPC4 machinery protection card

4-IOC4T input/output card for the MPC4

5-AMC8 analog monitoring card

6-IOC8T input/output card for the AMC8

7-RLC16 relay card (16 relays)

8-IRC4 intelligent relay card (4 DPDT or 8 SPDT relays).

An ABE04x rack can also contain the following:

9-CPUM modular CPU card

10-IOCN input/output card for the CPUM.

As outlined in 1.3Communicating with the VM600 MPS, the number of different elements

used depends on the complexity of the system and the specific application. However, a rack

necessarily has one of the following possibilities:

• Only MPC4/ IOC4T card pairs

• Only AMC8/ IOC8T card pairs

• A combination of MPC4/IOC4T and AMC8/IOC8T card pairs.

A networked ABE04x has one of the following additional possibilities:

• A CPUM card on its own

• A CPUM/ IOCN card pair.

3.2 Rack with MPC4/ IOC4T card pairs

Figure3-1 shows a block diagram of a networked rack featuring MPC4/ IOC4T card pairs. It

shows the interaction between these two cards as well as between them and other cards in

the rack.

The signals coming from measurement transducers and devices (such as accelerometers,

pressure transducers, proximity transducers, RTD thermometers and flow meters) are

connected to the IOC4T via the inputs CH1. CH2. CH3 and CH4. which are accessible at the

rear of the ABE04x rack. These raw signals are available to the user on BNC connectors

(named RAWOUT) on the panel of the MPC4 card. They are also available on the IOC4T

connector (raw outputs RAW1H and RAW1L, RAW2H and RAW2L, RAW3H and

RAW3L, and RAW4H and RAW4L).

The raw signals are processed by the MPC4 card using both analog signal processing and

digital signal processing. This card handles the management of signals, alarm levels, signal

processing and so on. The user is able to modify parameters concerning these operations by

using one of the VM600 MPSx software packages (MPS1 or MPS2), from the Meggitt

vibro-meter® product line.

Four alarm levels can be set for each channel, typically called Alert−(A−), Alert+(A+),

Danger−(D−) and Danger+(D+). These alarms, or combinations of them, can be used to

drive alarm outputs (relay outputs) on the IOC4T card. The OC Bus or Raw Bus can be used

to drive relays on an optional RLC16 card.

A DC output is available on the IOC4T card for each of the four measurement channels.

These outputs (DCOUT1 to DCOUT4) can be calibrated by software and configured by

jumpers to provide either a current-based signal (4to20mA) or voltage-based signal

(0to10V).

Three discrete signal interface (DSI) control inputs are available on the IOC4T card:

• Danger Bypass (DB) – To inhibit relay outputs associated with the Danger levels (D−

andD+).

• Trip Multiply (TM) – To selectively increase the Alert and Danger levels by a

programmable multiplying factor.

• Alarm Reset (AR) – To reset (clear) latched alarms.

The TACHO1 and TACHO2 inputs on the IOC4T card are intended for the connection of

rotational speed measurement systems. These signals (suitably shaped to be

TTL-compatible) are available on the BNC connectors (named TACHOOUT1 and

TACHOOUT2) on the panel of the MPC4 card. They can also be routed under software

control to other cards in the MPS rack via the Tacho Bus.

The VM600 MPSx software packages and Modbus can be used to send channel inhibit

commands to individual MPC4 channels (measurement and speed) in order to temporarily

bypass a sensor, that is, to temporarily inhibit the protection offered by any associated relays.