Functional Description SWT 3000 Equipment Manual
Page - 18 Edition p3_3_2x 08/09 © SIEMENS AG 2008
Monitoring
z Operating voltage
The output of commands from transmitter and receiver is disabled in case of failure
to meet the specified operating voltage tolerance.
z Switching command duration
The command outputs are disabled and an alarm triggered if a switching command
with a duration of > 500 ms is received (can be set as a parameter).
z Guard tone failure alarm
If there is no valid command frequency present a guard tone failure alarm is triggered
after about 10 ms.
z S/N ratio
A signal/noise alarm could be triggered (i.e. level ratio with AMP different, not with al-
ternate multi-purpose operation).
z Transmit level monitoring
The level of the transmit amplifier is monitored.
z Operating state
The operating state of the device is displayed on the front panel by means of differ-
ently coloured LED.
z Control contacts for external equipment
A floating normally open or normally closed contact (switchable) is available at the
device terminals for signaling the following alarms:
Pre- alarm
Receiver failure alarm
General alarm
z A signaling module IFC-S can be provided additionally as an option. With the aid of
this module any operation of the local circuit can be signaled externally via an auxil-
iary contact. (Note: maximum 2 interface modules possible)
z Measuring options
Decoupled measuring points at which the operating values can be monitored are ar-
ranged on the modules for start-up and maintenance of the unit.
z Input pulse suppression
Commands to be sent must be applied at the input for at least 1 ms in order to be
accepted as an input signal. This minimum time can be increased to 100 ms in steps
of 1 ms (settable as a parameter).
z Minimum transmission duration
Each command is transmitted for at least 15 ms (settable as a parameter).
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