Honeywell SYA14 Series Manual page 686

APPLICATION WARNINGS
IMPROPER INPUT CONNECTIONS
• To ensure the highest level of safety, connect two safety device outputs into the input channel of the FF-
SRS5935 safety module and always select the cross fault detection monitoring mode.
• If the safety device provides one safety output only (e.g., a switch driven by a direct acting mechanism like
some GK, GSS, CLS or Emergency Stop push buttons), connect the FF-SRS5935 module as shown in the
single input channel example. To avoid any short circuit possibilities on this single input channel, use
conduit to protect the wiring and additional protection for the terminal strips inside the machine cabinets.
IMPROPER EMERGENCY STOP CONNECTION
• To ensure maximum safety, connect two normally closed contacts of the Emergency Stop into the input
channel of the FF-SRS5935 module.
IMPROPER AUTOMATIC OPERATION MODE
• If the module is in the automatic operation mode, another part of the safety control circuitry must keep the
latched function engaged.
IMPROPER PUSH BUTTON USE
• To ensure maximum safety when using an external start push button, always select manual start mode
(handstart).
• Ensure the location of the manual restart function is outside of the danger zone and provides the operator
with a clear view of the zone.
• For perimeter guarding solution, the operator should not be able to reach manual restart from the danger
zone.
• A Programmable Logic Controller must NOT be able to override a manual restart function.
CONTACT WELDING
• Always protect all safety contacts with correctly rated fuses. These fuses must never exceed the rated FF-
SRS5935 safety output capability to prevent contact welding.
IMPROPER EXTERNAL SAFETY RELAY MONITORING
• When using additional safety relays, always connect one normally closed contact of each relay in series
inside the Final Switching Device (FSD) monitoring loop circuit (S33/S34). This connection will ensure
correct operation of the external relays after each FF-SRS5935 activation.
• If the FF-SRS5935 is not activated often, the customer is responsible for accomplishing any additional test
procedures of the external safety components. For instance, this testing can be done by removing the
power from the FF-SRS5935 at machine power up every day.
IMPROPER ARC SUPPRESSOR INSTALLATION
• Never install an arc suppresser across the safety output contact of the safety control module.
• Always install arc suppressers across the coils of external safety relays.
IMPROPER SYSTEM SAFETY LEVEL
• Several safety components can be connected to a FF-SRS5935 control module. If more than one safety
output is connected to one of the two input channels of the control module, always connect these safety
outputs in series. Parallel wiring of multiple outputs into a single channel can defeat the channel and cause
an unsafe condition.
• Individually activate and check all of the safety devices connected to a FF-SRS5935 control module to
ensure proper operation.
IMPROPER EMERGENCY STOP PUSH BUTTON
• The Emergency Stop push button must be designed according to safety standards (US and European).
• Under any condition, the Emergency Stop switch must be able to open its contacts when activated.
IMPROPER SAFETY CONTROL MODULE OPERATION
• The cable resistance between S11/S12 and S21/S22 must be less than 68 Ω (ohms) for correct operation
of the safety control module.
• A minimum of 21 Vdc must be present between each channel input (S11/S12 and S21/S22) to ensure the
correct detection of sensor(s) output status.
LONGER RESPONSE TIME
• The FF-SRS5935 module will have a longer response time (when the emergency push button is activated)
if the emergency stop push button is connected in series with the power supply of the module. However,
connecting the emergency stop push button to the safety input channels will result in a shorter response
time.
Failure to comply with these instructions could result in death or serious injury.
107017-11 EN FR26 GLO 0999 Printed in Germany 6