FIGURE 3. QUADRATIC TOTAL CURRENT LIMIT
107137-20 -EN FR26 GLO 305 Printed in Germany
3
20
40
60
80
100
120
0
10
20
30
40
50
60
T (˚C)
32
50
68
86
104
122
140
T (˚F)
Ambient temperature
Quadratic total current (A
2
)
I
2
(A
2
)
Figure 3 shows the maximal recommended safety
contact currents at a certain ambient temperature to
avoid overheating of the safety module.
To use this curve, do the following:
1. Square the currents in each safety contact branch
and sum the square currents to obtain the total
square limit (in A²).
2. Determine the maximal recommended external
temperature at the total square current limit:
Example: 5 A current per normally open contact:
Total square current limit :
∑
Ι
2
= (5A)
2
+ (5A)
2
+ (5A)
2
+
(5A)
2
=
100 A²
Max. external temperature: T = 39
°
C (102
°
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-SRE6029 must be installed inside an IEC IP 54
(NEMA 3) rating enclosure or better. The module can be
clipped easily onto a 35 mm (1.38 in.) width rail (see
figure 5 for installation and removal).
FIGURE 4. MOUNTING DIMENSIONS
(
for reference only)
Rail
c
b
a
a Width: 22,5 mm / 0.89 in.
b Height: 90 mm / 3.55 in.
c Depth: 121 mm 4.77 in.
FIGURE 5. INSTALLATION DIAGRAM
FSR1
FSR
E
5929
6
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 category of the interface is depending on the
safety category of the main safety device (emergency
stop module, safety light curtain, safety mat, etc.) and
the way of interconnecting it to the FF-SRE6029
Extension module.
Refer to the important application warnings (page 5)
for more details concerning safety.
FIGURE 6. INTERNAL CIRCUITRY
13 23 33 43
51
Y1
M8561
14 24 34 44
52
Y2
A1(+) A2(-)
A3(+) A4(-)
K1
K2
24V
24V
AL6029