Vibro-meter 200-505-018-011 three × Slot width/12 HP

Description

Vibro-meter 200-505-018-011 three × Slot width/12 HP
Terminology
MPC4 cards
The MPC4 machinery protection card is available in different versions, including a standard
version, a separate circuits version and a safety (SIL) version. See 1.7 Different versions of
the MPC4 card for addition information.
In general, MPC4 is used in this manual to refer to all versions of the card. However, where
it is necessary to make a distinction, MPC4 is used to indicate the standard and separate
circuits versions of the card and MPC4SIL is used to indicate the safety version.
RLC16 VM600 relay card
RPM revolutions per minute
RPS6U VM600 power supply
SFF safe failure fraction
SIF safety instrumented function
SIL safety integrity level
SIS safety instrumented system
SRS safety-related system
SP safety parameters
SRS safety-related system
TÜV A technical inspection agency (from the German –
Technischer Überwachungs-Verein)
vibro-meter® A Meggitt product line
VM
Vibro-Meter SA
(Vibro-Meter SA is now Meggitt SA and vibro-meter® is
a product line of Meggitt)
VM600 VM600 series of machinery protection systems and
conditon monitoring systems
VM600 MPSx VM600 MPS1 and VM600 MPS2 software
VME Versa Module Eurocard (a computer bus standard)
WEEE waste electrical and electronic equipment
XIO16T VM600 extended input/output card (for use with the
XMC16 and XMV16)
XMC16 VM600 extended monitoring card for combustion with
16 channels
XMV16 VM600 extended monitoring card for vibration with
16 channels
Abbreviation Meaning
Document reference MAVM600-FS/E SAFETY MANUAL
Edition 8 – September 2020 VM600 machinery protection system (MPS)
xi
Relays
By convention, the normally closed (NC) and normally open (NO) relay terminology refers to
the state of the relay contacts when the relay’s coil is de-energised. This use of the word
“normally” is not directly related to the “normal” operation/state of the machinery being
monitored, as explained below.
When the power supply to a device is turned off:
• There is a closed circuit between the normally closed (NC) and common (COM) contacts.
• There is an open circuit between the normally open (NO) and common (COM) contacts.
When the power supply to a device is turned on, the state of the relay contacts depends on
whether the relay’s coil is energised or de-energised.
When the relay’s coil is energised:
• There is an open circuit between the normally closed (NC) and common (COM) contacts.
• There is a closed circuit between the normally open (NO) and common (COM) contacts.
Whether a relay’s coil is energised or de-energised depends on how the relay has been
configured, for example, as normally de-energised (NDE) or normally energised (NE) and as
latched or not latched. It also depends on the control signal that is used to drive the relay. For
example, specific alarms (A+, D− and so on) generated by an MPC4 card.
A relay can be configured to be either normally de-energised (NDE) or normally energised
(NE).
Normally de-energised (NDE) and normally energised (NE) refer to the relay coil state (that
is, the relay switching circuit) when the hardware is powered and the signal driving the relay’s
control circuit is in a normal (non-alarm) state.
• For relays configured as normally de-energised (NDE), the control input to the relay’s coil
is off by default so there is a closed circuit between the NC and COM contacts (and an
open circuit between the NO and COM contacts) for a normal state.
• For relays configured as normally energised (NE), the control input to the relay’s coil is
on by default so there is an open circuit between the NC and COM contacts (and a closed
circuit between the NO and COM contacts) for a normal state.
NOTE: Relays configured as normally energised (NE) must de-energise to trip. That is:
• The relay is energised when the monitored levels are within their specified
tolerances, in
order to indicate normal operation.
• The relay is de-energised when the monitored levels are outside their specified
tolerances,
in order to indicate an alarm.
An advantage of normally energised (NE) relays is that the “de-energise to trip
principle” allows problems with hardware to be detected (for example, due to power
supply or wiring failures).