Vibro-Meter XMV16 – 16-channel vibration condition monitoring card

Vibro-Meter XMV16 – 16-channel vibration condition monitoring card

General block diagram

A block diagram of the AMC8. IOC8T, RLC16 and IRC4 cards is shown in Figure5-1. This

shows schematically the backplane, which physically divides the ABE04x rack into a front

card cage and a rear card cage.

The AMC8 (shown on the left of the diagram) is mounted in the front card cage. This card

effects the signal processing functions for the MPS. Its panel contains an LED indicator

(DIAG/STATUS) showing the hardware status of the AMC8/ IOC8T card pair. Additional

LED indicators are present to provide information on the status of each individual channel

(such as signal valid or the presence of alarms). The panel also has a 9-pin D-sub connector

for configuring an AMC8 card used in a stand-alone rack, that is, a rack not containing a

CPUM card.

Each AMC8 card is necessarily connected (via the backplane) to an IOC8T input/output card

mounted in the rear card cage. The IOC8T card’s panel (rear of rack) has terminals for

connecting the signal transmission lines coming from measurement sensors, such as RTD

devices, thermocouples and flow rate detectors). Other terminals are used to output

processed signal values (4to20mA, with 0to10V optionally available).

The IOC8T contains 4 local relays with outputs available on a screw terminal strip. In

applications needing more than the 4 relays provided by the IOC8T, an RLC16 relay card or

an IRC4 intelligent relay card can be installed in the rack.

The RLC16 card contains 16 relays and has a terminal strip with 48 screw terminals (3 strips

each having 16 terminals).

The IRC4 card contains 8 relays that can be combined as 4 DPDT or 8 SPDT and has a

terminal strip with 32 screw terminals (2 strips each having 16 terminals)

The AMC8 implements a variety of signal processing and monitoring functions, each of which

requires real-time continuous processing of the inputs.

The block diagram in Figure5-2 summarises the operation of the AMC8 card

5.2.1 Sensor Signal Conditioning This block (see Figure5-2) acts as a signal interface and is used to:

• Acquire a signal from the connected sensor.

• Check for signal overload (independently of the OK line check).

The AMC8 card does not have the ability to power external measuring devices. Where

necessary, an external power supply must be used.

See 5.3 Inputs and Outputs.

5.2.2 Signal Routing This block (see Figure5-2) is used only if cold-junction compensation (CJC) is required for

channels having a thermocouple connected.

The block enables a “cold junction” (CJ) temperature signal (generally obtained using an

RTD) to be routed to another channel on the card. One of two remote CJ signals can also be

selected. These come from other cards in the rack over Tacho Bus lines 7 and 8.

5.2.3 Signal Processing and Monitoring This block (see Figure5-2) assures the following:

1-Definition of “multi-channels”

Based on the eight single channels, four “multi-channels” can be defined. These can

group between two and eight single channels and perform various mathematical

operations on them, such as obtain the minimum, maximum or average value. The

difference between two individual channels can also be calculated.

See 5.4 Multi-channel processing functions. 2-Selection of the time-domain processing function

The functions include the following: direct output (bypass), average over a period of time,

maximum value over a period of time, minimum value over a period of time.

See 5.5 Time-domain processing functions. 3-Linearity compensation

Linear and non-linear sensor compensation can be applied for thermocouples and RTD

devices.

See 5.6 Linearity Compensation. 4-Monitoring

For single channels and “multi-channels”, the signal values (suitably processed and

compensated) are monitored and alarms generated if the thresholds are exceeded.

These alarms can be used to set relays.

Logical combinations of alarms can also be configured.

See 5.8 Alarm Monitoring. 5-Sensor OK Level Detection

This function monitors the OK levels for the sensor to check for hardware problems (for

example, faulty sensor or signal conditioner, or defective transmission line).

See 5.9 System Self-Checks