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FIG 3. QUADRATIC TOTAL CURRENT LIMIT
∑ I
2
2
(A
)
75
50
25
0
10
20
[32]
[50]
[68]
Figure 3 displays the maximum recommended external
temperature versus the total load of all the safety module
contacts. To use this curve, do the following :
(1)
Square the current in each contact branch, then sum
all the results to obtain the vertical axis value.
(2)
Follow the horizontal line from the obtained value and
note intersection of the appropriate curve.
(3)
Follow the intersection point down to determine the
maximal recommended external temperature. (Example:
2
å Ι
2
2
= (5 A)
+ (5 A)
+ (5 A)
contacts, then T = 50 °C (122 °F).
If the module is located in a higher temperature
environment, the lifetime of the electronic components may
be reduced. Ventilation of the cabinet may be required.
MECHANICAL INSTALLATION
The FF-SRM200P2 must be installed inside a NEMA 3
(IEC IP 54) rating enclosure or better. The module can be
clipped easily onto a 35 mm (1.38 in.) width DIN rail (see
figure 5 for installation and removal). Specific features of
this product include removable terminal strips (see figure
6). This feature provides easy access to wiring during
installation
and
reduces
maintenance.
FIG 4. MOUNTING DIMENSIONS
45 / 1.77
Rail
107111-11-EN FR26 GLO 503 Printed in Germany
T(˚C)
[˚F]
30
40
50
[86]
[104]
[122]
2
2
= 75 A
current inside safety
machine
downtime
during
(for reference only)
121 / 4.76
FIG 5. INSTALLATION DIAGRAM
FIG 6. REMOVABLE TERMINAL BLOCKS
CONTROL RELIABILITY
"Control Reliability" essentially means that "the device,
system or interface shall be designed, constructed and
interfaced such that any single component failure within the
device, interface or system shall not prevent normal
stopping action from beeing applied but shall prevent the
initiation of a successive operation until the failure is
corrected".
OSHA 29 CFR 1910.217 states that "the device shall be
constructed so that a failure within the system does not
prevent the normal stopping action from being applied to
the press when required, but does prevent initiation of a
successive stroke until the failure is corrected. The failure
shall be indicated by the system."
SAFETY CATEGORY OF INTERFACES
The safety function of the FF-SRM200P2 Muting Module
relies on dual channel safety inputs and safety outputs.
When properly connected, interfaces up to Category 4 per
EN 954-1 European norm can be achieved.
INTERNAL DESIGN
The internal design of this device meets high requirements.
The control circuit driving the contacts (13/14, 23/24, 33/34)
complies with Category 4 per EN 954-1.
Category 4 safety relay modules are designed and
manufactured in such a way that a single failure or an
accumulation of failures does not lead to the loss of the
safety function.
The FF-SRM200P2 muting modules function with dual
channel redundancy and positive self-checking monitoring.
This means that a faulty component in the system will
make the safety relay module fail in a safe mode.
Removable
Terminal block
2
r u n
1
r u n
K 2
K 1
3
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