Honeywell SYA14 Series Manual page 732

APPLICATION EXAMPLES (continued)
FIG 10. SINGLE CHANNEL EMERGENCY STOP CIRCUITRY
(WITHOUT CROSS-FAULT MONITORING, WITH EXTERNAL CONTACTORS)
S1 Cross fault detection
without
S2 Start mode
automatic
manual
Position of internal
switch S2 (Start mode):
see note (A)
This circuit has no redundancy in the emergency-stop control circuit and therefore offers a minor
safety level.
CONTACT REINFORCEMENT VIA EXTERNAL CONTACTORS:
With switching current >7 A, the output contacts should be reinforced by external safety contactors (K3 and
K4). (see Note(C) and Warning ).
1. After activation of the E-stop push button, the two K1 and K2 LED's will turn OFF, indicating that the two
internal safety relays K1 and K2 are de-energized. The normally open safety outputs 13/14 and 23/24
will open and de-energize the external contactors K3 and K4. The normally closed safety output will also
close.
2. After removing the stop condition, press and release the START push button to restart the safety
control module. If the two contactors K3 and K4 are working properly, the K1 and K2 LED's will turn ON
indicating that the safety relays K1 and K2 are energized. The two normally open safety contacts will
close and the normally closed safety contacts will open allowing the machine to operate.
APPLICATION NOTES:
Note (A): Start modes:
Manual start mode: Insert start push-button and select internal switch S2 as illustrated above
Automatic start mode: Insert jumper and select internal switch S2 to automatic start mode
Note (B): Single Channel safety devices: This may be an emergency stop push button with a single
output safety device in series such as safety limit or interlock switches (for example: CLS, GK and GSS).
Note (C) External contactors:
If contact reinforcement via external safety relays is necessary, the output contacts should be reinforced by
external safety relays with positive-guided contacts. The proper operation of the external contactors must
be monitored by looping the NC contacts into the Start loop between terminals S33/S34 (Final Switching
Device (FSD) monitoring).
CONTACT MULTIPLICATION VIA EXTERNAL RELAYS
• If contact multiplication via external safety relays (or the FF-SRE3081 Extension module) is necessary,
connect one normally closed contact of each relay in series (or 81/82) into the Start loop (terminals
S33/S34).
• Use two independent stop circuit safety relays with mechanically linked contacts to reliably detect a
welded contact.
Failure to comply with these instructions could result in death or serious injury.
8
24Vdc/ac (+)
Start
Fuse
K3
0V (-)
Emergency
stop
(A)
(B)
(C) (C)
K4
Honeywell
FF-SRS 5925
107035-02 EN FR26 ROW 0499 Printed in Germany
Fuses
L1
23 31
K3
K4
24 32
Machine Control
K3 K4
L2 L3
Fuses