GE Multilin L30 Line Current Differential System 5-249
5 SETTINGS 5.8 INPUTS AND OUTPUTS
5
Application Example 2:
A relay, having two latching contacts H1a and H1c, is to be programmed. The H1a contact is to be a Type-a contact, while
the H1c contact is to be a Type-b contact (Type-a means closed after exercising the operate input; Type-b means closed
after exercising the reset input). The relay is to be controlled from virtual outputs: VO1 to operate and VO2 to reset.
Program the Latching Outputs by making the following changes in the SETTINGS INPUTS/OUTPUTS CONTACT OUT-
PUTS CONTACT OUTPUT H1a and CONTACT OUTPUT H1c menus (assuming an H4L module):
OUTPUT H1a OPERATE: “VO1” OUTPUT H1c OPERATE: “VO2”
OUTPUT H1a RESET: “VO2” OUTPUT H1c RESET: “VO1”
Since the two physical contacts in this example are mechanically separated and have individual control inputs, they will not
operate at exactly the same time. A discrepancy in the range of a fraction of a maximum operating time may occur. There-
fore, a pair of contacts programmed to be a multi-contact relay will not guarantee any specific sequence of operation (such
as make before break). If required, the sequence of operation must be programmed explicitly by delaying some of the con-
trol inputs as shown in the next application example.
Application Example 3:
A make before break functionality must be added to the preceding example. An overlap of 20 ms is required to implement
this functionality as described below:
Write the following FlexLogic equation (EnerVista UR Setup example shown):
Both timers (Timer 1 and Timer 2) should be set to 20 ms pickup and 0 ms dropout.
Program the Latching Outputs by making the following changes in the
SETTINGS INPUTS/OUTPUTS CONTACT OUT-
PUTS CONTACT OUTPUT H1a and CONTACT OUTPUT H1c menus (assuming an H4L module):
OUTPUT H1a OPERATE: “VO1” OUTPUT H1c OPERATE: “VO2”
OUTPUT H1a RESET: “VO4” OUTPUT H1c RESET: “VO3”
Application Example 4:
A latching contact H1a is to be controlled from a single virtual output VO1. The contact should stay closed as long as VO1
is high, and should stay opened when VO1 is low. Program the relay as follows.
Write the following FlexLogic equation (EnerVista UR Setup example shown):
Program the Latching Outputs by making the following changes in the
SETTINGS INPUTS/OUTPUTS CONTACT OUT-
PUTS
CONTACT OUTPUT H1a menu (assuming an H4L module):
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