Honeywell SYA14 Series Manual page 683

FIG 3. QUADRATIC TOTAL CURRENT LIMIT
32 50 68 86
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) Depending on what current is inside the safety
module contacts (AC or DC), 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
temperature.
2
(Ex: ∑ Ι
2
= 200 A
contacts, then T = 22 °C (72 °F).
If the module is located in a higher temperature
environment, the lifetime
components may be reduced. Ventilation of the
cabinet may be required.
MECHANICAL INSTALLATION
The FF-SRS5935 must be installed inside a NEMA
3 (IEC IP54) rating enclosure or better. The module
can be clipped easily onto a 45mm width DIN rail
(see figures 4 and 5 for installation and removal).
Specific features of this product include removable
block terminals. This feature provides easy access
to wiring during installation and reduces machine
downtime during maintenance.
FIG 4. MOUNTING DIMENSIONS (for reference
only)
a Width: 45 mm 1.77 in.
b Height: 74 mm 2.91 in.
c Depth: 121 mm 4.76 in.
a
Rail
107017-11 EN FR26 GLO 0999 Printed in Germany
104 122 140 T(°F)
recommended external
, AC current inside safety
of the electronic
b
c
FIG 5. INSTALLATION DIAGRAM
FIG 6. REMOVABLE TERMINAL BLOCKS
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."
Honeywell has developed new patented self-
checking techniques which combine reliability with
safety. The FF-SR Series 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.
This design meets the highest requirements
(Category 4 as described in the EN 954 European
norm). Category 4 safety control modules are
designed and manufactured in such a way that a
single breakdown or an accumulation of failures
does not lead to the loss of the safety function
when a dangerous situation arises. The safety
function is maintained on a permanent basis.
Removable Terminal
Block
3