GE L90 Instruction Manual

Also see for L90: Communications manual Communications guide Instruction manual Instruction manual Instruction manual

Contents

5-156 L90 Line Differential Relay GE Multilin5.6 CONTROL ELEMENTS 5 SETTINGS5inactivity of the control input after which the pre-selected position is automatically applied. When the SELECTOR STEP-UP MODE is ìAcknowledgeî, the setting specifies the period of time for the acknowledging input to appear. The timer isre-started by any activity of the control input. The acknowledging input must come before the SELECTOR 1 TIME-OUTtimer expires; otherwise, the change will not take place and an alarm will be set.ï SELECTOR 1 STEP-UP: This setting specifies a control input for the selector switch. The switch is shifted to a newposition at each rising edge of this signal. The position changes incrementally, wrapping up from the last (SELECTOR 1FULL RANGE) to the first (Position 1). Consecutive pulses of this control operand must not occur faster than every50 ms. After each rising edge of the assigned operand, the time-out timer is restarted and the SELECTOR SWITCH 1:POS Z CHNG INITIATED target message is displayed, where Z the pre-selected position. The message is displayed forthe time specified by the FLASH MESSAGE TIME setting. The pre-selected position is applied after the selector times out(ìTime-outî mode), or when the acknowledging signal appears before the element times out (ìAcknowledgeî mode).When the new position is applied, the relay displays the SELECTOR SWITCH 1: POSITION Z IN USE message. Typically,a user-programmable pushbutton is configured as the stepping up control input.ï SELECTOR 1 STEP-UP MODE: This setting defines the selector mode of operation. When set to ìTime-outî, theselector will change its position after a pre-defined period of inactivity at the control input. The change is automatic anddoes not require any explicit confirmation of the intent to change the selector's position. When set to ìAcknowledgeî,the selector will change its position only after the intent is confirmed through a separate acknowledging signal. If theacknowledging signal does not appear within a pre-defined period of time, the selector does not accept the changeand an alarm is established by setting the SELECTOR STP ALARM output FlexLogicô operand for 3 seconds.ï SELECTOR 1 ACK: This setting specifies an acknowledging input for the stepping up control input. The pre-selectedposition is applied on the rising edge of the assigned operand. This setting is active only under ìAcknowledgeî mode ofoperation. The acknowledging signal must appear within the time defined by the SELECTOR 1 TIME-OUT setting after thelast activity of the control input. A user-programmable pushbutton is typically configured as the acknowledging input.ï SELECTOR 1 3BIT A0, A1, and A2: These settings specify a 3-bit control input of the selector. The 3-bit control wordpre-selects the position using the following encoding convention:The ìrestî position (0, 0, 0) does not generate an action and is intended for situations when the device generating the3-bit control word is having a problem. When SELECTOR 1 3BIT MODE is ìTime-outî, the pre-selected position is appliedin SELECTOR 1 TIME-OUT seconds after the last activity of the 3-bit input. When SELECTOR 1 3BIT MODE is ìAcknowl-edgeî, the pre-selected position is applied on the rising edge of the SELECTOR 1 3BIT ACK acknowledging input.The stepping up control input (SELECTOR 1 STEP-UP) and the 3-bit control inputs (SELECTOR 1 3BIT A0 through A2) lock-out mutually: once the stepping up sequence is initiated, the 3-bit control input is inactive; once the 3-bit controlsequence is initiated, the stepping up input is inactive.ï SELECTOR 1 3BIT MODE: This setting defines the selector mode of operation. When set to ìTime-outî, the selectorchanges its position after a pre-defined period of inactivity at the control input. The change is automatic and does notrequire explicit confirmation to change the selector position. When set to ìAcknowledgeî, the selector changes its posi-tion only after confirmation via a separate acknowledging signal. If the acknowledging signal does not appear within apre-defined period of time, the selector rejects the change and an alarm established by invoking the SELECTOR BITALARM FlexLogicô operand for 3 seconds.ï SELECTOR 1 3BIT ACK: This setting specifies an acknowledging input for the 3-bit control input. The pre-selectedposition is applied on the rising edge of the assigned FlexLogicô operand. This setting is active only under theìAcknowledgeî mode of operation. The acknowledging signal must appear within the time defined by the SELECTORTIME-OUT setting after the last activity of the 3-bit control inputs. Note that the stepping up control input and 3-bit controlinput have independent acknowledging signals (SELECTOR 1 ACK and SELECTOR 1 3BIT ACK, accordingly).A2 A1 A0 POSITION0 0 0 rest0 0 1 10 1 0 20 1 1 31 0 0 41 0 1 51 1 0 61 1 1 7