GE C70 Instruction Manual page 500

INPUTS/OUTPUTS
5.9.3.2 Latching outputs
SETTINGS  INPUTS/OUTPUTS  CONTACT OUTPUTS  CONTACT OUTPUT H1a
 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
5
OUTPUT H1a OPERATE
in this input to safely close the contact. Once the contact is closed and the
input, such as subsequent chattering, does not have any effect. With both the
OPERATE
(logic 1), the response of the latching contact is specified by the
OUTPUT H1a RESET
this input to safely open the contact. Once the contact is opened and the
input, such as subsequent chattering, does not have any effect. With both the
RESET
1), the response of the latching contact is specified by the
— This setting specifies the contact response under conflicting control inputs; that is, when both the
OUTPUT H1a TYPE
and
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.
5-296
OUTPUT H1a ID

L-Cont Op 1
OUTPUT H1a OPERATE:

Off
OUTPUT H1a RESET:

Off
OUTPUT H1a TYPE:

Operate-dominant
OUTPUT H1a EVENTS:

Disabled
LATCHING OUT ERROR
— This setting specifies a FlexLogic operand to operate the 'close coil' of the contact. The relay seals-
— This setting specifies a FlexLogic operand to operate the 'trip coil' of the contact. The relay seals-in
signals are applied. With both control inputs applied simultaneously, the contact closes if set to
Figure 5-164: Contact input/output module type 4L contact 1 logic
Range: up to 20 alphanumeric characters
Range: FlexLogic operand
Range: FlexLogic operand
Range: Operate-dominant, Reset-dominant
Range: Disabled, Enabled
FlexLogic operand, event, and target message.
RESET
OUTPUT H1a TYPE
OPERATE
setting.
OUTPUT H1a TYPE
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL
CHAPTER 5: SETTINGS
input is logic 0 (off), any activity of the
and inputs active
OPERATE RESET
setting.
input is logic 0 (off), any activity of the
and inputs active (logic
OPERATE RESET