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2924113

P1-P3P4-P6P7-P9P10-P12
MACX MCR-EX-SD-21-25-LP(-SP)
103466_en_00 PHOENIX CONTACT 7
5.4 Mounting
Figure 5 Mounting and removing
– Mount the device on a 35 mm DIN rail according to
EN 60715.
– When using a DIN rail connector (ME 6.2 TBUS-... ,
Order No. 2869728), insert this into the DIN rail first.
This is used for error messages.
Please also ensure you observe the direction of the
module and DIN rail connector when snapping into
position:
Snap-on foot below (2) and connector left (1).
– The device is loop-powered and so does not require its
own power supply.
It can, however, be snapped in isolation onto a DIN rail
connector that supplies power to non-loop-powered
MACX MCR-EX modules.
– Install the module in suitable housing to meet the
requirements for the protection class.
– Before startup, check that the solenoid driver is
operating and wired correctly, especially with regard to
the wiring and labeling of the intrinsically safe circuits.
5.5 Connecting the cables
– Pluggable screw terminal blocks
(on MACX MCR-EX-SD-21-25-LP); litz wires provided
with ferrules.
– Pluggable spring-cage terminal blocks
(on MACX MCR-EX-SD-21-25-LP-SP); litz wires
provided with ferrules.
– Lay intrinsically safe and non-intrinsically safe cables
separately.
– Permissible cable cross-section: 0.2 mm
2
to 2.5 mm
2
.
– Screw connection:
– Insert the wire into the corresponding connection
terminal block.
– Use a screwdriver to tighten the screw in the
opening above the connection terminal block.
– Spring-cage connection:
– Insert a screwdriver in the opening above the
connection terminal block.
– Insert the wire into the corresponding connection
terminal block.
6 Comparison of safety data
Safety data for
For the values for U
o
, I
o
, P
o
, L
o
and C
o
, please refer to
"Safety data according to ATEX for intrinsically safe circuits"
on page 3 and the EC type-examination certificate.
Requirements for intrinsic safety (simple circuits):
WARNING: Explosion hazard
If the device has been used in non-
intrinsically safe circuits,
it must not be used
again in intrinsically safe circuits.
Clearly label the module as being non-intrinsically
safe.
2
C
1
B
A
WARNING: Explosion hazard
Compare the safety data before connecting a
device located in the intrinsically safe area to the
MACX MCR-EX-SD-21-25-LP(-SP).
Field devices: U
i
, I
i
,
P
i
, L
i
, C
i
Solenoid drivers: U
o
,
I
o
,
P
o
, L
o
, C
o
U
i
≥ U
o
I
i
≥ I
o
P
i
≥ P
o
L
i
+ L
c
≤ L
o
(L
c
and
C
c
are
dependent on the
cables/lines used.)
C
i
+ C
c
≤ C
o
MACX MCR-EX-SD-21-25-LP(-SP)
103466_en_00 PHOENIX CONTACT 8
7 Calculating a valve circuit
Figure 6 Equivalent circuit
In order to connect a solenoid valve to the device, it is also
necessary calculate the measurements in addition to
comparing the safety data.
R
SV
and U
SV
are determined by the copper resistance,
which depends on the ambient temperature.
The values of R
SV
and I
SV
must be obtained from the valve
manufacturer. The values for R
i
and
U
V
can be found in the
technical data under "Output" on page 2.
On the basis of this, the permissible cable resistance can be
calculated according to the formula below:
In the event of a negative resistance, a successful
connection is no longer guaranteed.
Function requirements: I
V
≥ I
SV
and R
C
> 0 Ω.
R
i
: Internal resistance of solenoid driver
U
V
: Guaranteed voltage of the solenoid driver without
load
I
V
: Maximum current that can be supplied by the
solenoid driver
R
C
: Maximum permissible cable resistance when
connecting the solenoid driver and valve
R
SV
: Effective coil resistance of the solenoid valve
(the copper resistance of the coil depends on the
temperature)
I
SV
: The current required by the solenoid coil so that the
valve can close tightly
U
SV
: The voltage which is applied across the coil with I
SV
Recommendation:
For R
C
, an actual cable
resistance of +25 Ω should
be calculated.
You can obtain a list of suitable valves from the
Download Center at
www.download.phoenixcontact.com
.
SV
I
I
R
SV
U
C
R
SV
R
V
U
ValveSolenoid driver
U
V
R
C
=––– R
i
– R
SV
I
SV
MACX MCR-EX-SD-21-25-LP(-SP)
103466_en_00 9
PHOENIX CONTACT GmbH & Co. KG • 32823 Blomberg • Germany • Phone: +49-(0) 5235-3-00
PHOENIX CONTACT • P.O.Box 4100 • Harrisburg • PA 17111-0100 • USA • Phone: +717-944-1300
www.phoenixcontact.com
8 Safety-related applications (SIL 3)
8.1 Response times
Following a state change at the input, the output enters the
safe state in ≤ 20 ms.
8.2 Operating mode of the safety function
Operating mode as per EN 61508: "Low demand mode"
8.3 Failure behavior and required response
1. The safe state is entered in the event of an input voltage
failure.
2. The safe state is reached by removing the device's
connection terminal blocks.
8.4 Safety integrity requirements
Failure rates
– Type A device (according to EN 61508-2)
– Safety Integrity Level (SIL) 3
PFD
AVG
values
Since the PFD
AVG
value is 0, it is not necessary to perform
regular proof tests. This is, however, still recommended
(see Section 8.5).
Failure limit
The operating mode is based on low demand mode. The
percentage of the device at PFH/PFD for the overall safety
loop is 10%.
Figure 7 Safety loop
Conditions
– The failure rates of the components used remain
constant throughout the period of use.
– Propagation of errors by the device in the system is not
taken into consideration.
– The repair time (= replacement) should take eight
hours.
– The failure rates of the external signaling device are not
taken into consideration.
– The average temperature at which the device is to be
used is +40°C. This is based on standard industrial
conditions.
8.5 Proof Test
Even where the PFD
AVG
value is 0, it is still recommended
that you check the function of the valve burner in conjunction
with the entire safety loop.
1. Take appropriate steps to prevent incorrect use.
Prevent other areas of the system from being affected
by the proof test
(e.g., set the control system to test mode).
2. When a voltage of between 20 V and 30 V is applied at
the input, check whether a voltage of > 0 can be
measured at the output terminal blocks.
The field device must switch at the same time.
3. Restore the safety circuit to full functionality.
4. Return to normal operation.
9Appendix
Exida assessment summary (3 pages)
λ
SAFE
λ
DANGEROUS
SFF
1
1
SFF = Safe Failure Fraction
DC
S
2
2
DC = Diagnostic Coverage (safe or dangerous)
DC
D
2
284 FIT
3
3
FIT = Failure in Time (1 FIT = 1 failure/10
9
h)
0 FIT 100% 0% 0%
T[PROOF] = 1 year 5 years 10 years
PFD
AVG
1
=
1
PFD = Probability of Failure on Demand
0 0 0
Sensor and
switching
amplifier
35%
Processing
15%
Actuator
control
10%
Actuator
40%
P1-P3P4-P6P7-P9P10-P12

2924113

Mfr. #:
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Phoenix Contact
Description:
DIN Rail Terminal Blocks MACX MCR-EX-SL-SD- 21-25-LP-SP
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