GE G30 Instruction Manual

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GE Multilin G30 Generator Protection System 5-2195 SETTINGS 5.7 CONTROL ELEMENTS5The selector switch element is intended to replace a mechanical selector switch. Typical applications include setting groupcontrol or control of multiple logic sub-circuits in user-programmable logic.The element provides for two control inputs. The step-up control allows stepping through selector position one step at atime with each pulse of the control input, such as a user-programmable pushbutton. The three-bit control input allows set-ting the selector to the position defined by a three-bit word.The element allows pre-selecting a new position without applying it. The pre-selected position gets applied either after time-out or upon acknowledgement via separate inputs (user setting). The selector position is stored in non-volatile memory.Upon power-up, either the previous position is restored or the relay synchronizes to the current three-bit word (user set-ting). Basic alarm functionality alerts the user under abnormal conditions; for example, the three-bit control input being outof range.A selector switch runs every two power cycles.• SELECTOR 1 FULL RANGE: This setting defines the upper position of the selector. When stepping up through avail-able positions of the selector, the upper position wraps up to the lower position (position 1). When using a direct three-bit control word for programming the selector to a desired position, the change would take place only if the control wordis within the range of 1 to the SELECTOR FULL RANGE. If the control word is outside the range, an alarm is establishedby setting the SELECTOR ALARM FlexLogic operand for 3 seconds.• SELECTOR 1 TIME-OUT: This setting defines the time-out period for the selector. This value is used by the relay inthe following two ways. When the SELECTOR STEP-UP MODE is “Time-out”, the setting specifies the required period ofinactivity of the control input after which the pre-selected position is automatically applied. When the SELECTOR STEP-UP MODE is “Acknowledge”, 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.• 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(“Time-out” mode), or when the acknowledging signal appears before the element times out (“Acknowledge” 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.• SELECTOR 1 STEP-UP MODE: This setting defines the selector mode of operation. When set to “Time-out”, 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 “Acknowledge”,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 FlexLogic operand for 3 seconds.• 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 “Acknowledge” 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.• SELECTOR 1 3BIT A0, A1, and A2: These settings specify a three-bit control input of the selector. The three-bit con-trol word pre-selects the position using the following encoding convention: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