107018-04 EN FR26 GLO 1198 Printed in Germany
3
FIG 3. QUADRATIC TOTAL CURRENT LIMIT
Σ
T(°C)
32
50
68
86
104
122 T(°F)
Limit curve
Ambient temperature
Quadrati
c
total
current (A
²)
Figure 3. displays the maximal 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. (Ex:
∑
Ι
2
= 200 A
2
current inside
safety contacts, then T = 35
°
C (95
°
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-SRS5988 must be installed inside a
NEMA 3 (IEC IP54) rating enclosure or better. The
module can be clipped easily onto a 35 mm (1.38 in.)
width DIN rail (see figures 5 and 6 for installation
and removal). Specific features of this product
include removable terminal strips. This feature
provides easy access to wiring during installation
and reduces machine downtime during
maintenance.
FIG 4. MOUNTING DIMENSIONS
(for reference only)
FIG 5. INSTALLATION DIAGRAM
FIG 6. REMOVABLE TERMINAL BLOCKS
Removable
Terminal Block
CONTROL RELIABILITY
“Control Reliability” means that “the device,
system or interface shall be designed, constructed
and installed such that a single component failure
within the device, interface or system shall not
prevent normal stopping action from taking place but
shall prevent a successive machine cycle.” (ANSI
B11.19-1990, 5.5)
OSHA 29 CFR 1910.217 states that “the control
system 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 detectable by a simple test, or indicated by the
control system.”
SAFETY LEVEL OF INTERFACES
The safety function of the FF-SRS5988 Safety
control module relies on dual channel safety inputs.
Therefore this module can be used in interfaces up
to Category 4 per EN 954-1 European norm.
INTERNAL DESIGN
The
internal
design of this device also meets the
highest requirements (Category 4 as described in
the EN 954-1 European norm).
Category 4 safety control modules are designed and
manufactured in such a way that a single breakdown
or an accumulation of internal failures does not lead
to the loss of the safety function when a dangerous
situation arises.
The FF-SRS5988 safety control modules function
with dual channel redundancy and positive self-
checking monitoring. This means that a faulty
component in our system will make the safety control
modules fail in a safe mode.
The safety function is maintained on a
permanent basis.
a Width: 100 mm 3.93 in.
b Height: 74 mm 2.91 in.
c Depth: 121 mm 4.76 in.
a
c
b