SATEC C191HM - Manual (Page 11)

2 Chapter 1 Introduction
screen with a programmable scroll interval of 2 to 15 seconds. Automatic return
to the main screen is available after 30 seconds of uninterrupted use. The front
panel also includes:
• bar graph showing percentage load with respect to user-definable nominal
(100%) load current
• alarm LED providing a local indication when a predefined alarm condition
appears. The alarm LED is shut off manually (by pressing on both up and
down keys more than 5 sec)
• RXD/TXD LEDs showing communications receive/transmit status
Setup is menu driven, with optional password protection. 16 programmable
setups are provided for alarm and control functions (for programmable
parameters, see ‘Measured Parameters’ below).
Communications are available using an RS-232 or RS-485 standard (factory
set), with ASCII/Modbus (and optional DNP3.0) protocols. 120 user assignable
registers are available in ASCII/Modbus protocols.
Eight relays are provided for energy pulsing (KYZ) or alarm and remote control.
Contacts of six relays may switch loads up to 250V, 5A AC and are
recommended for alarm and remote control; contacts of two relays may switch
loads up to 250V, 3A AC and may be used for energy pulsing.
One optically isolated analog output is provided for remote monitoring or
control. Current loop options are 0-20 and 4-20 mA. The analog output must be
used with an external power supply.
Four counters are provided for counting user-defined events or their duration.
These can be used for counting total operation time of generators or overload
time of transformers or power lines. The counters are operated and released by
user-defined triggers.
One digital input can be used as a status input for monitoring external contacts
or as an external synchronization input for power demand interval
synchronization. When no external synchronization pulse is provided, the power
demand interval can be synchronized through communications.
Three user-selectable options are provided:
Power calculation mode
Energy rollover value
This option specifies the point at which the energy value rolls over to zero.
Phase energy calculations mode
This option is used to enable or disable phase energy calculations.