Honeywell SYA14 Series Manual page 644

APPLICATION EXAMPLES
TWO-HAND CONTROL (WITHOUT EXTERNAL CONTACTORS)
FUNCTIONAL DESCRIPTION
After releasing one of the two external hand switch contacts Sa or Sb (as illustrated above), the two internal safety
relays K1 and K2 will de-energize. The normally open safety outputs 13/14 and 23/24 will open and relay the stop
condition to the machine control circuitry. After closing Sa and Sb in less than half a second, the safety relays K1
and K2 will energize. This action will occur only if both external hand switches Sa and Sb have been previously
deactivated. The two normally open safety contacts 13/14 and 23/24 will close and the machine will be allowed to
operate.
The Final Switching Device (FSD) monitoring loop has to be closed (Y1-Y2, jumpered).
TWO-HAND CONTROL (WITH EXTERNAL CONTACTORS)
FUNCTIONAL DESCRIPTION
For high current, the output contacts should be reinforced by using external safety relays.
The proper operation of the external contactors is monitored by looping the NC contacts into the FSD
monitoring circuit (terminals Y1/Y2).
After releasing one of the two external hand switch contacts Sa or Sb (as illustrated above), the two
internal safety relays K1 and K2 will de-energize. The normally open safety outputs 13/14 and 23/24 will
open, de-energizing the external contactors K3 and K4. This action will relay the stop condition to the
machine control circuitry. After closing Sa and Sb in less than half a second, if the two contactors K3 and
K4 are working properly, the internal safety relays K1 and K2 will energize. This action will occur only if
both external hand switches Sa and Sb have been previously deactivated. The two normally open safety
contacts 13/14 and 23/24 will close, energizing the external contactors K3 and K4, and the machine will be
allowed to operate.
6 107011-10 EN FR26 GLO 0499 Printed in Germany