The governing standard of the information
Insulation
to deliver effective predictive All
and IMDs must be labelled to highlight sy
preventive maintenance that avoids shutdowns,
f Battery ability to provide load current
monitoring device (IMD) is BS EN 61557-8
per increases productivity use
reduces as
downtime,
and i.e AC, DC or AC/DC.
f Battery in service monitoring
improves profitability.
IEC 60364-4 and BS7671 557.3.4.3. and 538.1.1
Feature
BA 300
BS EN 61577-8
prohibits use of passive
devices
Comply
with
EN
61557-8
No
in an IT circuits which cannot detect symmetrical
No
faults. A symmetrical
fault is particularly
dangerous
Detection of symmetrical faults
(Passive, voltage imbalance principle)
to control circuit because it can lead to inadvertent
Insulation trippping
faults in AC/DC mixed
circuit I,e
switching or false
without
detection. The
No
involving battery charger, UPS
diagram below shows a double high resistance
resistance value
5K-90K Ohms
symmetrical Measured
insulation
fault on DC PLC
circuit. The
Self-test and checks for IR
No
fault is not detectable by the passive device and
location system as per IEC 61557-9
No
can therefore Fault cause
switch to be seen
as closed.
Bender IMD
Yes
Yes
Yes (full)
1K – 20M Ohms
Yes
Yes (optional)
Insulation monitoring technology co
Tel: 44(0) 1229 480123
with earth fault location
systems devel
BS7671 clause
557.3.201
states:
“A No control circuit
www.bender-uk.com
E/F detection
in de-energised
circuit
Yes
Bender are employed in a wide range o
shall be designed, arranged and protected to limit
control circuit applications within
dangers resulting from a fault between the control
An alternative way of monitoring for earth faults is by using a
Earth fault alarm is an optional function on BA300 and shouldn’t
sectors
that
simply
cannot
circuit and passive
other measurement
conductive
parts
liable
to does
cause
principle,
although
this method
not
be included
with an external
earth
fault monitoring
system. afford unsc
Comparison
of
earth
fault
detection
features
on
an
IT
system is in product
comply
with
the
IEC61557-8
regulations
for
insulation
monitoring
shutdowns or interruptions
malfunction devices.
(e.g. inadvertent operation) of the shown below.
operations.
controlled equipment.”
Tel: 44(0) 1229 480123 Tel ROI: +353 process
1 5060611
Availability of measured value
No
Yes
BENDER UK
Low Mill Business Park, Ulverston, Cumbria, LA12 9EE
Battery management system such as a BA 300 provides the
following monitoring functions compared with IMD:
•
•
•
•
•
Knowledge is power
The benefits of using insulation monitoring technology to enable
early identification of earth faults in mission critical AC or DC
control and auxiliary supplies cannot be underestimated.
Over and under voltage conditions
High impedance alarm
Earth fault alarm
Battery ability to provide load current
Battery in service monitoring
Continuous monitoring equips maintenance teams and plant
operators with the vital information to deliver effective predictive
and preventive maintenance that avoids shutdowns, reduces
downtime, increases productivity and improves profitability.
IP67/68 Rated
Waterproof
Coaxial Cable Assemblies
Waste Mgmt.
Agri-Tech
Security
Communications
Perfectly suited for harsh environments such as Waste
Management, Agriculture Technology, and many others.
www.gradconn.com
Issue 33 PECM
63