Schmalz SMPi 20, Operating Instruction, Page: 15 / 50

S
CHMALZ
SCP
I
/ SMP
I
3-15
Status display for system vacuum
The ejector is equipped with a status display for the system vacuum and monitoring func-
tions. System states are indicated in
RED
or
GREEN
. The status display is updated after
every suction cycle that is activated over the suction signal input.
During conventional suction cycles, the status display is used to display the system vacuum
level based on the H1 switching point. The status display goes out after a conventional suc-
tion cycle ends.
V
ACUUM MONITORING
Status display Vacuum monitoring
GREEN
Rising vacuum: Vacuum

H1
Falling vacuum: Vacuum

H1-h1
RED
Vacuum < H1
M
ONITORING FUNCTIONS
If the H1 switching point is never reached within a suction cycle, then the status display re-
mains
RED
, even after the cycle is finished and the diagnostic signal output is set..
The ejector has a valve protection function. With the air-saving function activated
[ctr=on]
and high leakage rates in the gripper system, the ejector switches constantly between the
“Venturi nozzle active” and “Venturi nozzle inactive” states. The number of valve switching
procedures thus increases rapidly within a short time. In order to protect the ejector and in-
crease its service life, the ejector switches the air-saving function off automatically at a
switching frequency of > 6/3 seconds and activates continuous suction (i.e. the ejector then
remains in the “Venturi nozzle active” state). The status display remains
RED
until the next
suction cycle and the diagnostic signal output is set.
Status display Monitoring function Reaction of ejector
RED
H1 never exceeded in suc-
tion cycle
-
Suction valve switches
> 6/3 seconds
(RD ejectors)
Ejector is set to continuous suc-
tion (i.e. the ejector then remains
in the “Venturi nozzle active”
state - valve protection function)