
74
Festo — VTSA-F-CB — 2021-06a
Malfunctions
LED
Meaning
Possible error
LEDs of the solenoid coils 12 and 14
off
–
Signal not pending
–
logic 0
–
yellow
light
1)
–
Signal is pending
–
logic 1
Valve has not switched although a
signal is pending.
The following malfunctions may be
present:
–
Operating voltage of the valves is
outside the permissible tolerance
range (21.6 … 26.4 V DC)
–
Compressed air supply defective
–
Pilot exhaust air blocked
–
Service required
1) The LED for double solenoid valves only lights briefly during the switching pulse
Tab. 49: LED displays of the valves
10.1.1.3 LED displays of the soft start valves
LED
Meaning
Possible errors
Solenoid coil LED 14
off
–
Signal not pending
–
logic 0
–
yellow
light
–
Signal is pending
–
logic 1
Valve has not switched although a
signal is pending.
The following malfunctions may be
present:
–
Operating voltage of the valves is
outside the permissible tolerance
range (21.6 … 26.4 V DC)
–
Compressed air supply defective
–
Pilot exhaust air blocked
–
Service required
LED of the pressure switch
green
light
–
Pressure in duct (1) is exhausted.
–
Bit on the CPX terminal is set (bit: 1).
–
Group error LED of the soft start valve
P
(on the manifold sub-base)
red light Error in the valve (group error)
–
Tab. 50: LED displays of the soft start valves