Features - Omron G3ZA - MANUAL 2 User Manual

Features

1-1 Features
SSR Drive Selection
V2
Main Functions
Offset Control
Manipulated Value
Calculations
Effective Current Monitor
V2
Error Detection (4-channel
Controllers Only)
Number of Outputs
Connected
Alarm Output
Installation
2
The G3ZA is a Multi-channel Power Controller with externally connected
SSRs. It can receive manipulated variables from a PLC, EJ1 Temperature
Controller, or other host via RS-485 communications and control heater power
with high precision via the SSRs.
The control method used to drive the SSRs can be selected to enable using
the G3ZA for a variety of applications. For example, to use a single-phase
halogen heater, soft-start optimum cycle control can be selected to reduce
inrush power when starting.
SSR
SSR for single-phase heater with
zero-cross function
SSR for single-phase heater without
zero-cross function
SSR for three-phase heater with
zero-cross function
Refer to 4-2 Selecting the SSR (Control Method) 4 or 8-channel Models)
for details on selecting the SSR and the control method.
• The timing of turning ON the control outputs for G3ZA channels can be
offset to help prevent control outputs from being turned ON at the same
time.
• The manipulated variable can be calculated for one channel and the cal-
culated value can be output for another channel.
• The effective current flowing to a heater can be monitored to one decimal
place.
• The current flowing through the heater can be monitored to detect heater
burnouts, heater overcurrents, and SSR short-circuits. (This function can
be used for SSRs with ratings of up to 150 A.)
• Between one and four outputs can be connected to 4-channel Controllers
and between one and eight outputs can be connected to 8-channel Con-
trollers.
• An open-collector output terminal can be used to inform the host of errors
without using communications.
• RS-485 communications can be used to set and operate the G3ZA,
reducing the amount of wiring required between the G3ZA and host.
• Up to 31 Controllers can be connected to one communications line. With
4-channel Controllers, up to 124 channels can be controlled, and with 8-
channel Controllers, up to 248 channels can be controlled.
• Up to 8 G3ZA Multi-channel Power Controllers can be connected to the
communications port of an EJ1@-TC2/4. In addition, it is not necessary to
create a communications program for communications between the EJ1
and G3ZA.
Control method
Optimum cycle control
Soft-start optimum cycle
control
Three-phase optimum cycle
control
Section 1-1
Application
example
Single-phase
heaters
Single-phase
halogen heaters
Three-phase
heaters
V2