42
The state of monitored output in the activated condition is determined the load current as
described in table 1.4.3.5.
Table 1.4.3.5
Monitored Output States in Activated Condition
Output State
Open Circuit
Normal
Open Circuit
Load Current, А
0 …
‘open current ‘*
‘open current’*
… 2,5
More than 2,5
* - the open current values are defined by the
Activated Output Monitoring
parameter
.
1.4.3.16
The
Activated Output Monitoring
parameter specifies the monitoring of a load circuit
for open-circuit fault in the activated condition. Possible values are shown in
. The parameter
is relevant only if the
Monitoring Mode
is set as monitoring for output open-circuit fault u (
Open Fault
or
Open and Short Faults
)
If the Standard(Normal) is selected for this parameter, the fixed values of 5 mA is used for “
open
fault current
”.
This selection is recommended if single actuators are connected.
If the Programmable Threshold is selected, the value set in the
Open Fault Threshold
is used as
the “
open-fault current”
where the range from 5 to 2,500 mA can be specified.
This mode is recommended, if multiple actuators are connected to one output, and these actuators
do not allow short-term power disconnection.
When the Regular Off-Load Checks parameter is selected, a fixed value of 5 mA is used as
the ‘open current’. In this case, the device disconnects the load for 125ms every 30 seconds, during
which the integrity of the line to the terminal element is checked.
The monitoring mode is preferable when several actuating devices are connected to one
output and they allow a short-term power disconnection (light and sound alarms). At the same
time, the monitoring of the line integrity is ensured throughout all communication line and the
number of sirens is limited only by the maximum permissible output current.
With the value of the parameter Output Current Drop Check is selected, the device
accumulates the value of the average load current when the output is turned on.
If the load current is dropped down for more than 1/4 of the average value, the open fault is
registered.
If the load current is jumped for more than 1/4 of the average value, a short-circuit of the
output is stated.
Smooth changes in the load current due to changes in the supply voltage are taken into
account in the accumulated average value.
It is recommended to use this mode when no more than four actuators with the same consumption
current are connected to the output. Correct operation of this type of control with a large number of
actuators is impossible.
1.4.3.17
The On/Off Events parameter defines whether it is needed to report on output operation
events.
1.4.3.18
All panel outputs (monitored and non-monitored) can be controlled by two ways:
–
Using standard control programs as response to the current input state and logically linked to
controlled output; and by Start and Stop buttons (local control);
