HARDWARE MANUAL Document reference MAMPS-HW/E
VM600 machinery protection system (MPS) Edition 18 - March 2022
3-2
Rack with MPC4 / IOC4T card pairs
GENERAL SYSTEM DESCRIPTION
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 (DC OUT 1 to DC OUT 4) can be calibrated by software and configured by
jumpers to provide either a current-based signal (4 to 20 mA) or voltage-based signal
(0 to 10 V).
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−
and D+).
• 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 TACHO 1 and TACHO 2 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 TACHO OUT 1 and
TACHO OUT 2) 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.
NOTE: The safety version of the MPC4 card (MPC4SIL) does not does not support the
danger bypass (DB), trip multiply (TM) and channel inhibit functions.
The CPUM card acts as a “rack controller”. In general, it communicates with the
MPC4 / IOC4T card pairs over the VME bus.
NOTE: The safety version of the MPC4 card (MPC4SIL) does not have a VME bus
interface so it cannot communicate with a CPUM or any other cards in a VM600
rack (see 4MPC4/IOC4T card pair).
The CPUM, and therefore the rack, can communicate with the outside world over RS-232 and
Ethernet links. The CPUM can operate on its own in the rack, but it is generally used with the
associated IOCN card. Depending on the options installed, the IOCN allows communication
with a host computer or computer network over one or several RS 232, RS-422, RS-485 or
Ethernet links.
See 4 MPC4 / IOC4T card pair for more detailed information on the MPC4 / IOC4T card pair.
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