©Danfoss A/S 03-2009, AC-BNM,mr
IC.PI.P10.K4.49-520B3567
5
017R9328
017R9328
Low Pressure Limiter
Scale plate directly indicates Low Switching Point. There is no
pointer for Differential.
Differential value is fixed and printed on the scale plate.
1. Set Low Switching Point by adjusting range screw (fig. 7)
2. High Switching Point is equal to Low Switching Point plus
Differential:
HIGH = LOW + DIFFERENTIAL
High Pressure Limiter
Scale plate directly indicates High Switching Point. There is no
pointer for Differential.
Differential value is fixed and printed on the scale plate.
1. Set High Switching Point by adjusting range screw (fig. 7)
2. Low Switching Point is equal to High Switching Point less
Differential:
LOW = HIGH - DIFFERENTIAL
Protection for settings
The protective cap on adjustment screws may be used to lock and
seal the settings (fig. 6)
Manual reset
For resetting use the screwdriver (Fig. 5)
Manual reset is possible to operate only after return of pressure to
cut-in level.
Before releasing the reset, the cause of the shutdown must be
found and eliminated.
BCP pressure controller with auto reset as a
limiting device
Since the pressure controller BCP has no lockout with manual
resetting, this function must be realized externally as a part of a
safety logic e.g. by external contactors and/or relays which then
are to be used according to the requirements of prEN50156-1
standard for safety relevant hardware.
External closure must not be interlocked, while loss of auxiliary
energy must lead to a closure.
Resetting must not be automated; it has to be performed
manually.
Resetting on fault must lead to a repeated closure. When BCP
limits, for rising or falling application, the external safety logic
must change to the fail safe position.
Endurance of any external contactors and relays must be accord-
ing to EN12952-11, which means 250000 switching cycles under
conditions similar to operating conditions and be capable of a
mechanical life time of 3000000 switching cycles.
Conditions similar to operating conditions include chemical and
climatic influences as well as electrical and mechanical stresses.
In addition, contactors must fulfil EN60947 and relays must fulfil
EN60255.
BCP with double bellows
BCP6, BCP6H, BCP7, and BCP7H have a double bellows; an outer
bellows and a regulating (inner) bellows.
When system pressure exceeds the set value, the BCP will
automatically stop the plant. The double bellows system prevents
loss of media in the event of bellows rupture. A rupture in the
inner bellows will cause the control cut-out pressure to fall about
3 times less the set value, thus the system will stop. A rupture in
the outer bellows will cause the control cut-out pressure to fall to
about 3 bar under the set value, thus providing a fail-safe function.
Safety requirements
Installation
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with respect to health and safety at work must be observed
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carried out only by qualified staff, trained in all technical aspects
of their operation
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(empty of its fluid) in order to avoid any danger to the operator
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connections are made to avoid possible electrical shock or
damage to equipment. Never touch live parts with your fingers
or with any tool
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application must be used. The cable must be connected with
adequate stress relief in order to prevent that pullig forces can
be carried through the cable to the plug
Commissioning
Before putting pressure control into operation, check that:
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the product label and this instruction notice
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Operation
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are installed
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with respect to health and safety at work must be observed
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must be qualified for the task
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operates properly
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Overloaded or damaged control must be exchanged
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control from the system
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leakage after a faulty operation or on a periodic basis under
normal conditions
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by Danfoss must be used for the applicaiton concerned.
Danfoss can accept no responsibility in case of alterations made
on the pressure controls or the use of them against the
instructions of Danfoss
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caused by the use of parts, accessories or controls which are not
original Danfoss parts
Instructions