Document reference MAMPS-HW/E HARDWARE MANUAL
Edition 18 - March 2022 VM600 machinery protection system (MPS)
4-7
Inputs and outputs
MPC4 / IOC4T CARD PAIR
4.3.1 Sensor signal conditioning
This block (see Figure 4-3) acts as a signal interface and is used to:
• Acquire a dynamic signal from the connected sensor.
• Check for signal overload (independently of the OK line check).
• Power the connected sensor.
• Output the raw signals. These are available on BNC connectors on the panel of the card
(for example, for connection to an oscilloscope). Refer to the MPC4 machinery protection
card data sheet for buffer specifications.
4.3.2 Signal routing
This block (see Figure 4-3) enables flexible connection of signals. It allows the system to:
• Connect any sensor to any signal processing/monitoring channel input.
• Connect any sensor to two, three or four signal processing/monitoring channels. This
enables several processing/monitoring functions to be performed on the same sensor
signal.
4.3.3 Signal processing and monitoring
This block (see Figure 4-3) assures the following:
1- Selection of the Processing Function
The processing functions include the following types of monitoring: Absolute Bearing
Vibration, Relative Shaft Vibration (and Gap), Absolute Shaft Vibration, S
max
,
Eccentricity, Broad-Band Pressure, Temperature and so on.
See 7 Processing modes and applications for all the possibilities available.
2- Rectification
The rectification techniques available are described in 4.5 Rectification techniques.
3- Monitoring
The rectified values are monitored and alarms generated if the thresholds are exceeded.
These alarms can be used to set relays.
The block also allows logical combinations of alarms to be configured. In addition, it
handles the Adaptive Monitoring and Direct Trip Multiply functions.
The monitoring possibilities are described in 4.6 Alarm monitoring.
4- 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).
OK level detection is described in 4.7 System self-checks.
The MPS allows single and dual processing (the latter indicated by the dashed lines in
Figure 4-3). The following dual processing options can be software configured:
• Dual Processing Channels 1 & 2
• Dual Processing Channels 3 & 4.
4.4 Inputs and outputs
4.4.1 Measurement signal inputs
The sensors connected to the four measurement channel inputs (that is, the CH1, CH2, CH3
and CH4 terminals on the IOC4T) deliver conditioned signals to the MPC4 card. These
conditioned inputs are composed of AC signals with or without a DC component. Typically,
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