Elster LCR-212 Single Phase Load Control ... - Essential Energy

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UNCLASSIFIED OPERATIONAL PROCEDURE - Elster LCR-212 Single Phase Load Control Ripple Receiver Installation and Use CEOP8086 3.2 Time Base The time base is normally derived from the mains frequency. However, it can also optionally be derived from the crystal oscillator of the microcontroller. 3.3 Internal Clock The internal clock can be set at a fixed time by a special conventional telegram. Through the use of VERSACOM, it is possible to synchronise the receiver's clock at any chosen time. 3.4 Microcontroller 3.4.1 Memory The processor has an integrated ROM, RAM and EEPROM to store parameters and status data. Status data is stored in the RAM, while parameters transmitted by means of remote programming are stored in the EEPROM. 3.4.2 Serial Interface The receiver has a standard RS232 electrical or optical interface which is used for programming and for reading out status data. 3.5 Power Supply The standard version of the LCR212 is designed for 230/240. The power supply unit, which is capable of withstanding short circuits, supplies the stabilised power supply voltage for the individual function groups. It is designed so as to sustain functions in the event of a supply interruption lasting up to 1.5 seconds. 3.6 Output Relays With the use of plug-in 40A relays, users have the possibility of fitting up to three relays in the receiver (see installation and connection diagram). Relay status is also refreshed every 40 seconds, provided the relays have been triggered once by means of a switching command or a switching program after connection of the mains or restoration of the mains power after a failure. This allows correction of unauthorised relay status changes (anti-tamper). 3.7 Real Time Clock (Optional) Voltage interruptions of up to approximately 72 hours can be bridged using a real time clock and supercap. It is possible to use the receiver as a self sufficient remotely controllable timer in this way. LCR-212 receivers that have the real time clock option fitted are issued under the acronym of LCR-212RTC. 22 March 2011 - Issue 3 Approved By: General Manager Technical Services Page 8 of 17 UNCLASSIFIED UNCONTROLLED COPY IF PRINTED
UNCLASSIFIED OPERATIONAL PROCEDURE - Elster LCR-212 Single Phase Load Control Ripple Receiver Installation and Use CEOP8086 4 RECEIVER FUNCTIONS 4.1 Switching On/Off When defining the parameters, the switch-on status can be specified separately for each relay. The execution of switch-ON operations in the receiver can be delayed within a maximum random delay time in the range from 1 second – 24 hours. 4.2 Restoration of Supply This function is activated when power is restored, following programming, or when the mains is connected for the first time. The following actions can be programmed separately for each of the three relays: • ON or OFF relay status • Cyclic switching • Switching to the relay state prevailing before failure of the mains power • No reaction. To avoid abrupt load swings, execution of the switching functions can be randomly delayed within a preset maximum time. The selected delay time is identical for all three relays and can be chosen within a range from 1 second – 24 hours. If the receiver executes a delay when the mains power returns, then commands arriving during this delay time are acted on and the ROS reaction of the relays addressed is rendered inactive. 4.3 Loss of Supply This function is activated in the event of a power failure. It is possible to set the relays to a preselected switching position after expiry of a definable power failure bridging time of 0.5 – 1.5 seconds. The following actions can be assigned to the relays after the failure bridging time has elapsed: • ON or OFF relay status • No action 4.4 Wiping Timer After reception of a command, the addressed relay switches to the ON position and then independently switches to the OFF position after expiry of a specified time. It is possible to retrigger the wiping timer function, i.e. the running timer is restarted on receipt of a repeated command. A delay time of 1 second – 24 hours and a random delay time can be assigned for execution of the command. 4.5 Cyclic Switching A cyclic switching function can be assigned to relays 1 – 3. The cyclic period T applies to all relays and can be specified within the range of 1 second - 24 hours. The following features can also be assigned to each cyclic switching command: • cycle time Tk (ON duration) within the time range from 1 second – 24 hours • number of switching cycles • start of switching at cycle time Tk or T – Tk 22 March 2011 - Issue 3 Approved By: General Manager Technical Services Page 9 of 17 UNCLASSIFIED UNCONTROLLED COPY IF PRINTED
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Elster LCR-212 Single Phase Load Control ... - Essential Energy

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