Operating Relay Outputs; Operating The Logical Controller - Satec Expertmeter EM720 Operation Manual

Chapter 2 Operating the EM720

Operating Relay Outputs

Operating the Logical Controller

22
Fault Recorder setup (see
Recorder in Chapter 5)
• External synchronization of power demand intervals
– select a digital input as an external power demand
sync source (see
• External synchronization of the meter clock – select
a digital input as a time synchronization input (see
Local Settings
aligned pulses from the external master clock
source.
All digital inputs have a user-programmable debounce
time from one to 100 milliseconds. See
Inputs in Chapter 5 on how to configure digital inputs in
your meter.
Up to four relay outputs can be provided in your EM720
with two expansion
modules. See the EM720 Installation Manual for available
relay output ratings and connections.
See Section Operating Digital Inputs
terminals location and relay status LED indicators.
All relay outputs are updated at a half-cycle rate.
Each relay is independently programmable in the EM720
and can operate in latched, unlatched, pulse or KYZ mode.
Relay operations can be inverted so that the relay is
energized in its non-active state and de-energized when it
is operated. This mode, known as "failsafe" mode, may be
used for signaling purposes to send alarms when the
device is not operational either due to a fault or due to
loss of power.
Each relay can be operated either locally from a control
setpoint in response to an internal or external event, or by
a remote command sent through communications, or can
be directly linked to an internal pulse source producing
energy or interval pulses.
See Configuring Relay Outputs
configure relay outputs in your meter.
See Using Control Setpoints
operate relay outputs via setpoints.
See Remote Relay Control
relays via PAS.
The embedded logical controller allows monitoring any
measured quantity
indication, counting and recording events whenever the
EM720 Power Quality and Revenue Meter
Operating Relay Outputs
Configuring the Fault
Basic Meter Setup
in Chapter 5) and provide minute-
2-channel 2DI/2DO
above for the relay
in Chapter 5 on how to
in Chapter 5 on how to
in Chapter 6 on how to operate
or external contacts
in Chapter 5)
Configuring Digital
replaceable
to provide