5-364
L60 LINE PHASE COMPARISON SYSTEM – INSTRUCTION MANUAL
INPUTS/OUTPUTS
CHAPTER 5: SETTINGS
5
5.8.3.2 Latching outputs
SETTINGS
INPUTS/OUTPUTS
CONTACT OUTPUTS
CONTACT OUTPUT H1a
The latching output contacts are mechanically bi-stable and controlled by two separate (open and close) coils. As such
they retain their position even if the relay is not powered up. The relay recognizes all latching output contact cards and
populates the setting menu accordingly. On power up, the relay reads positions of the latching contacts from the hardware
before executing any other functions of the relay (such as protection and control features or FlexLogic).
The latching output modules, either as part of the relay or as individual modules, are shipped from the factory with all
latching contacts open. It is highly recommended to double-check the programming and positions of the latching contacts
when replacing a module.
Since the relay asserts the output contact and reads back its position, it is possible to incorporate self-monitoring
capabilities for the latching outputs. If any latching outputs exhibits a discrepancy, the LATCHING OUTPUT ERROR self-test
error is declared. The error is signaled by the
LATCHING OUT ERROR
FlexLogic operand, event, and target message.
OUTPUT H1a OPERATE
— This setting specifies a FlexLogic operand to operate the ‘close coil’ of the contact. The relay seals-
in this input to safely close the contact. Once the contact is closed and the
RESET
input is logic 0 (off), any activity of the
OPERATE
input, such as subsequent chattering, does not have any effect. With both the
OPERATE
and
RESET
inputs active
(logic 1), the response of the latching contact is specified by the
OUTPUT H1a TYPE
setting.
OUTPUT H1a RESET
— This setting specifies a FlexLogic operand to operate the ‘trip coil’ of the contact. The relay seals-in
this input to safely open the contact. Once the contact is opened and the
OPERATE
input is logic 0 (off), any activity of the
RESET
input, such as subsequent chattering, does not have any effect. With both the
OPERATE
and
RESET
inputs active (logic
1), the response of the latching contact is specified by the
OUTPUT H1a TYPE
setting.
OUTPUT H1a TYPE
— This setting specifies the contact response under conflicting control inputs; that is, when both the
OPERATE
and
RESET
signals are applied. With both control inputs applied simultaneously, the contact closes if set to
“Operate-dominant” and opens if set to “Reset-dominant.”
Figure 5-207: Contact input/output module type 4L contact 1 logic
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.
CONTACT OUTPUT H1a
OUTPUT H1a ID
L-Cont Op 1
Range: up to 20 alphanumeric characters
OUTPUT H1a OPERATE:
Off
Range: FlexLogic operand
OUTPUT H1a RESET:
Off
Range: FlexLogic operand
OUTPUT H1a TYPE:
Operate-dominant
Range: Operate-dominant, Reset-dominant
OUTPUT H1a EVENTS:
Disabled
Range: Disabled, Enabled