GE C70 Instruction Manual page 383

CHAPTER 5: SETTINGS
— This setting specifies the contact response under conflicting control inputs; that is, when both the
OUTPUT H1a TYPE
and signals are applied. With both control inputs applied simultaneously, the contact closes if set to
OPERATE RESET
"Operate-dominant" and opens if set to "Reset-dominant."
Application example 1
A latching output contact H1a is to be controlled from two user-programmable pushbuttons (buttons number 1 and 2). The
following settings are applied.
Program the Latching Outputs by making the following changes in the
OUTPUTS  CONTACT OUTPUT H1a
: "
OUTPUT H1a OPERATE
PUSHBUTTON 1 ON
: "
OUTPUT H1a RESET
PUSHBUTTON 2 ON
Program the pushbuttons by making the following changes in the
and
 USER PUSHBUTTON 1 USER PUSHBUTTON 2
PUSHBUTTON 1 FUNCTION
PUSHBTN 1 DROP-OUT TIME
PUSHBUTTON 2 FUNCTION
PUSHBTN 2 DROP-OUT TIME
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
OUTPUTS  CONTACT OUTPUT H1a
: "VO1"
OUTPUT H1a OPERATE
: "VO2"
OUTPUT H1a RESET
: "VO2"
OUTPUT H1c OPERATE
: "VO1"
OUTPUT H1c RESET
Since the two physical contacts in this example are mechanically separated and have individual control inputs, they do not
operate at exactly the same time. A discrepancy in the range of a fraction of a maximum operating time can occur.
Therefore, a pair of contacts programmed to be a multi-contact relay do 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
control 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.
Write the following FlexLogic equation (EnerVista example shown).
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
menu (assuming an H4L module):
"
"
menus:
: "Self-reset"
: "0.00 s"
: "Self-reset"
: "0.00 s"
and
CONTACT OUTPUT H1c
SETTINGS  INPUTS/OUTPUTS  CONTACT
PRODUCT SETUP  USER-PROGRAMMABLE PUSHBUTTONS
SETTINGS  INPUTS/OUTPUTS  CONTACT
menus (assuming an H4L module):
INPUTS/OUTPUTS
5
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