Fault Signaling - Siemens POINTEK CLS200 Manual De Arranque Rápido

• high alarm:
• low alarm:
The setting is selected by turning dip switch 3 on or off.

Fault Signaling

The Failsafe function puts the process into a safe mode of operation in the event of a fault
or failure (such as a loss of power). When the Pointek CLS200/300 standard model
responds to a failure, the output switches according to the Failsafe setting
two Failsafe options:
• Failsafe High
• Failsafe Low
The following examples assume that the pump should be turned off in the event
Note:
of a failure. If this is not the case in your process, please see the relay diagram on
page 29 (for CLS200) or page 35 (for CLS300), and make the appropriate connections to
suit your application.
Failsafe High is used in applications where Pointek CLS200/300 is set to turn off a pump
when the level becomes too high (probe covered, or level too close to probe). When
Failsafe High is selected, the device will respond to a failure (regardless of the true level)
as if it were a high level alarm (alarm ON/solid-state switch open). The pump will stop,
preventing an overfill.
Failsafe Low is used in applications where CLS200/300 is set to turn off a pump when the
level becomes too low (probe uncovered). When Failsafe Low is selected, CLS200/300
will respond to a failure (regardless of the true level) as if it were a low level (alarm ON/
solid-state switch open). The pump will stop, preventing the pump from running dry.
no fault
uncovered covered uncovere
probe
CLOSED
switch
OFF
alarm
1.
Or, if the trip point is set to detect the approaching level, when that trip point is reached.
2.
Failsafe/Alarm Setting: S3
See
details.
Page 80 Pointek CLS200/300 Standard – OPERATING INSTRUCTIONS
alarm ON/switch open when level is higher than the set point
(probe becomes covered
alarm ON/switch open when level is below the set point (probe
becomes uncovered)
Failsafe High
fault
covered uncovered covered
d
OPEN OPEN
ON ON
on page 30 (for CLS200) or on page 36 (for CLS300) for
1
)
Failsafe Low
no fault
uncovere
OPEN CLOSED
ON OFF
2
. There are
fault
covered
d
OPEN
ON
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