Device And Function Description - DOLD SAFEMASTER S UH 6937 Mode D'emploi

Device and function description

Muting function
The frequency monitoring function can be overridden on the display and by
an appropriate activation of the software Digital Inputs: SW1 to SW4. For
this purpose, the muting function should be activated when parametering
on the display. Once this function is activated, then it will continue to be
possible to continue to switch over between the frequency moduses: 1 to 3,
as described above. Should a selection be made of the frequency mode 4
(muting) via the 'SW' software inputs, then no further frequency monitoring
will be conducted. The output relays remain permanently on and the start-up
delay function (t ), the switchover time period function (t ), the reset-delay
A U
function (t ) and the alarm-delay function (t ) will all be reset.
F V
Analogue output A+ and A GND
The analogue output 2-10 V shows the actual measured frequency. The
maximum value of the analogue output (10 V) is equal to the adjusted
upper frequency threshold. The minimum value of the analogue output
(2 V) is equal to the adjusted lower frequency threshold. The scaling is
frequency linear.
In the monitoring function „underfrequency" the maximum value of the
analogue output is equal to the highest possible setting value of the device
(Variant UH 6937/0_ _ = 600 Hz and UH 6937/1_ _ = 1000 Hz).
In the monitoring function „overfrequency" the minimum value of the ana-
logue output is equal to 0 Hz.
If the muting function is selected, the maximum value of the analogue output
is equal to the maximum setting value of the device (Variant UH 6937/0_ _
= 600 Hz and UH 6937/1_ _ = 1000 Hz) and the minimum value is equal
to 0 Hz.
In the case of a failure the analogue output goes to 0V.
The analogue output is not safety related. It can be used for diagnosis.
Switchover time period t
U
The switchover time period expires when the frequency mode is altered
during operations at the Software Inputs: SW1 to SW4, the output contacts
are closed, no start-up delay function is running and the Switchover Time
Period: 'tU' has not already been initiated and/or is running. During this
time period, no frequency monitoring is conducted and the output contacts
remain on.
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UH 6937 / 23.12.20 en / 337A