Omron G3ZA User manual

Multi-channel power controller
A smart approach to fast, low-noise heater power regulation.
The G3ZA is a multi-channel power controller that provides clever
switching of up to eight solid state relays (SSRs). It is available
in four versions - either with 4 channels (with heater burnout
alarm) or 8 channels (without heater burnout alarm), and for
high- or low-voltage power supplies.
This multi-channel power controller is designed to improve
performance of existing heater switching control components
while reducing complexity and costs. Install the G3ZA beside
a bank of SSRs and reap the benefits of reduced wiring and
simplified programming control! The advantages of this
distributed control are immediately apparent. The small-sized
unit can control up to eight SSRs with only a single RS-485 2-wire
link to the PLC or PC. The manipulated variable control signal
(output %) from the PLC is automatically converted into a PWM
trigger signal within the G3ZA, so there is no need for an extra
conversion unit or digital output cards.
The G3ZA is designed according to Omron’s Smart Platform
concept for easy integration of components and systems.
PLC function blocks are available to significantly reduce ladder
programming time.
G3ZA
Actual
size
Advanced Industrial Automation
Product positioning
Phase angle
High speed
High resolution Low speed Coarse resolution
~0 0 1s 5s 10s +
G3ZA + SSRSCR SSR EM relay
Zero cross Standard SSR solutions

Features at a glance
•Compact size
•Capable of driving up to
eight SSRs
•Connects to RS-485 Compoway-F
network (ModBus in preparation)
•Better performance with
standard SSRs
•Lower noise than with Phase
Angle (SCR) control
•Lower peak current when using
offset control
Optimum Cycle Control
The G3ZA uses Optimum Cycle Control to improve
overall performance and provide more accurate temper-
ature control. When used together with any zero-
switching SSR (e.g. Omron’s G3NA) the G3ZA achieves
extremely low power noise levels that meet stringent
EMC standards. Power factor is significantly improved
and bulky filtering installations normally required for
phase control are not needed. In addition, the G3ZA
uses half-cycle switching and has a resolution of 10ms,
making it ideal for applications where precise tempera-
ture control is crucial.
Offset control
By using an offset control algorithm for the various
channels, the G3ZA reduces peak switching currents
and enables the downsizing of ancillary units and
cabling. At lower powers in a full production cycle (for
example MV < 40%), the benefit becomes significant
because the total current is distributed more evenly in
time. The more heaters you use the greater the benefit!
Monitoring and control
The G3ZA uses an RS-485 communications link to
receive MV signals from a PLC or PC and to send back
status information (like heater burnout detection).
Because it only involves a two-wire link, the G3ZA can
be located inside the power cabinet, and the cabinet
can be placed close to the heater.
Typical applications for the
G3ZA include:
Multi-zone electrical ovens
In roller hearth continuousfurnaces, where tempera-
tures reach 800°C, the G3ZA’s stable, distributed
switching is ideal during critical parts of the
heating process.
Thermo-moulding
The G3ZA is suitable for the PET bottle pre-forming
process where many heaters are needed along with
lots of power and precise heating control to get the
moulded product just right.
TV industry
The treatment and coating of glass windows, especially
in the flat-panel display manufacturing process,
requires fast, accurate heating and cooling. The G3ZA’s
ability to distribute power accurately and quickly
makesitsuitable for this application.
Available product types
Number of channels Heater burnout detection Load power supply
G3ZA-4H203-FLK-UTU
G3ZA-4H403-FLK-UTU
G3ZA-8A203-FLK-UTU
G3ZA-8A403-FLK-UTU
4
8
Yes
No
100 to 240 VAC
400 to 480 VAC
100 to 240 VAC
400 to 480 VAC
Host
(e.g. PLC or PC)
G3ZA
SSR
SSR
SSR
CT
Load
Load
Load
Load power
supply
20%
50%
ch1
ch2
ch3
ch1
ch2
ch3
Tot al
current
Traditional ON/OFF control Offset control
Tot al
current
SF2P_G3ZA_EN_INT01_0305
Although we strive for perfection, Omron Europe BV and/or its subsidiary and affiliated companies do not warrant or make any representations regarding the correctness or completeness of the information described in this document. We reserve the right to make any changes at any time without prior notice.
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