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REMOTE-CONTROLLED VARIABLES (REMX)
– DCRG8F can manage up to 16 variables controlled remotely (REM1…REM16).
– These are variables which status can be modified by the user through the communication protocol and that can be used in combination with outputs.
– Example: using a remote variable (REMx) as a source for an output (OUTx), it will be possible to freely energise or de-energise one relay through the supervision software. This would allow the use of DCRG8F
outputs to control loads, e.g. lighting or other.
USER ALARMS (UAX)
– The user can define a maximum of 8 programmable alarms (UA1…UA8).
– For each alarm, it is possible to define:
• The source, that is the condition that generates the alarm.
• The message text, that is displayed when this condition takes place.
• The alarm properties (just like for standard alarms), that is how the alarm interacts with the control of the power factor correction board.
– The condition that generates the alarm can be, for instance, the overcoming of a threshold. In this case, the source will be one of the limit thresholds LIMx.
– If instead, the alarm must be displayed depending on the status of an external digital input, then the source will be an INPx.
– For every alarm, the user can define a free-text message that is displayed on the alarms page.
– The properties of the user alarms can be defined in the same way as the normal alarms. You can choose whether a certain alarm will disconnect the steps, close the global alarm output, etc. See chapter Alarm
properties.
– When several alarms are active at the same time, they are displayed sequentially and their total number is shown on the status bar.
– To clear an alarm programmed with latch, use the dedicated command in the commands menu.
– For alarm programming and definition, refer to setup menu M26.
COMMAND OF DCTL THYRISTOR MODULES VIA RS485 BUS
The DCRG8F controller, if used in combination with Lovato thyristor modules DCTL series, can command the thyristor modules through an RS485 serial bus.
Compared to the command via static outputs, this mode allows to monitor the status and electrical measures of each DCTL thyristor module (temperature, currents, voltages, THDI, residual power, working hours,
etc..) directly on the display of the DCRG8F controller.
It is possible to connect on the RS485 bus up to 32 thyristor modules DCTL series.
LIMIT THRESHOLDS (LIMx)
– The LIMn thresholds are internal variables whose status depends on the out-of-limits of one particular measurement set by the user (e.g. total active power higher than 25kW) among all those measured.
– To make the setting of thresholds easier, since the limits can span in a very wide range, each of them can be set using a base number and a multiplier (for example: 25 x 1k = 25000).
– For each LIM, there are two thresholds (upper and lower). The upper threshold must always be set to a value higher than the lower one.
– The meaning of the thresholds depends on the following functions:
Min function:
The lower threshold defines the trip point while the upper threshold for reset. The LIM trips when the selected measurement is less than the lower threshold for the programmed delay. When the
measured value is higher than the upper setpoint, after the set delay, the LIM status is reset.
Max function:
The upper threshold defines the trip point while the lower threshold for reset. The LIM trips when the selected measurement is more than upper threshold for the programmed delay. When the
measured value is below the lower setpoint, after the delay, the LIM status is reset.
Max+Min function:
Both thresholds are for tripping. When the measured value is less than the lower or more than the upper setpoint, then the LIM will trip after the respective delays. When the measured value
returns within the limits, the LIM status will be immediately reset.
– Trip denotes either activation or de-activation of the LIM variable, depending on ‘Normal status’ setting.
– If the LIMn latch is enabled, the reset can be done only manually using the dedicated command in the commands menu.
– See setup menu M24.
1 - Type of measurement
2 - Upper threshold
3 - Threshold delay
4 - Lower threshold
5 - Status of the limit
6 - Measurement value
7 - Function
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