G-114 Safety Sensors / Components
G9SA-321-T# (24 VAC/VDC) with 2-channel Limit Switch Input/Manual-reset
Feedback loop
Motor controller
Timing Chart
Motor rotation
OFF-delay time
Open
Off delay 
timer
Control 
circuit
Operation 
instruction
S1:  Safety Limit Switch 
with direct opening mechanism 
(D4N or D4B)
S2: Limit switch
S3: Reset switch
KM1 and KM2: Magnetic Contactor
M: 3-phase motor
Limit switches 
S1 and S2
Reset switch 
S3
K1 and K2 
(NC)
K1 and K2 
(NO)
K3 and K4 
(NC)
K3 and K4 
(NO)
KM1 and KM2 
(NC)
KM1 and KM2 
(NO)
Operation 
instruction
Note: This circuit achieves EN954-1 Safety Category 4. 
The OFF-delay output, however, achieves EN954-1 
Safety Category 3.
F502-EN2-04.book  Seite 114  Dienstag, 26. Juli 2005  5:48 17