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PROPORTIONAL CONTROLLER
Specification No. 562-5-305
The CZT is designed for use in systems such as room or return water
control. The CZT can be used for single or two stage control. The CZT
is suitable for use with 0 to 10Vdc actuators and/or step controllers.
The controller is designed to be simple to install and easy to use. The
controller is used in simple plants typically in schools, libraries and
large domestic installations. It may be installed either within a control
panel or can be wall mounted.
The large Liquid Crystal Display (LCD) is used to recall plant status,
temperature values and for programming the controller. The user can
recall, display and adjust parameters quickly and easily, prompted by
the controller display. The facia has clearly labelled push-buttons for
use when setting the controller. There is an overlay card which must
be placed over the controller display for use in Fine Tune Mode. A
rotary selector switch is provided to enable overrides to be quickly and
easily applied.
The CZT is shipped with standard (default) values for parameters.
These default settings are used so that in most cases only a minimal
number of parameters need to be amended to get the best out of the
controller. It is important, however, that you tune the CZT to your
control system to get the best out of it. Typical default values that need
to be checked/set are:-
Actuator ramp speed
Controller tuning
FEATURES
•
Easy to install and commission.
•
Shipped with typical default values for the parameters,
decreasing commissioning time.
•
Quick Set Mode allows basic settings to be easily checked and
set.
•
Simple override switch.
•
Operates one or two stage systems.
•
Standard 0 to 10Vdc output.
•
Large Liquid Crystal Display (LCD) for viewing plant status/
temperature and controller parameters.
•
Two setting modes available (Quick Set and Fine Tune) so that
users are only presented with the required parameters.
•
Night Set Back (NSB) and Set-Up inputs.
•
Existing CZT sensors can be used.
•
Remote set value from an RPW.
DS 2.105
CZT
10/97
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Summary of Contents for SIEBE Satchwell CZT
- Page 1 DS 2.105 10/97 PROPORTIONAL CONTROLLER Specification No. 562-5-305 The CZT is designed for use in systems such as room or return water control. The CZT can be used for single or two stage control. The CZT is suitable for use with 0 to 10Vdc actuators and/or step controllers. The controller is designed to be simple to install and easy to use.
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Page 2: Specifications
DS 2.105 2 - 12 10/97 SPECIFICATIONS Type: CZT 5305 – One or two stage, 0 to 10Vdc output, proportional controller - Specification No. 562-5-305 Power Supply: 230Vac, +10%, -6% (50/60Hz) Power Consumption: 22VA fully loaded Fuse: 100mA on the 230Vac input OUTPUTS Location of Controller •... -
Page 3: Display And Settings
10/97 3 - 12 DS 2.105 RELOADING THE DEFAULT VALUES This procedure only needs to be carried out if you need to reload the controller default values. The controller will also automatically configure itself to the sensors connected to it. The following procedure will reload the CZT default values. - Page 4 DS 2.105 4 - 12 10/97 Review Mode The review mode is a read only display mode. It shows various The controller functions available for viewing in Review Mode are as temperatures and the status of the actuator(s). follows: No settings can be changed in this mode, except the facilities on the Symbol Description manual override switch.
- Page 5 10/97 5 - 12 DS 2.105 Overlay Card Printing, Fine Tune Mode Only Fig.2 Entering and Exiting The Fine Tune Mode The Fine Tune Mode is used by Commissioning Engineers and the more advanced users to set the Fine Tune parameters. The overlay card must be placed on the CZT to use the Fine Tune mode.
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Page 6: Typical Applications
DS 2.105 6 - 12 10/97 TYPICAL APPLICATIONS SINGLE STAGE HEATING OR COOLING The CZT can operate in single stage heating or cooling mode to By using an RPW the CZT set value can be set from a remote point. control, for instance, room temperature. - Page 7 10/97 7 - 12 DS 2.105 TWO STAGE HEATING AND COOLING The CZT can operate in two stage heating and cooling mode to control, By using an RPW the CZT set value can be set from a remote point. for instance, room temperature. The CZT also has a set-up and set-back input to modify the controller set value from a time switch or other remote contact.
- Page 8 DS 2.105 8 - 12 10/97 BOILER SEQUENCE SCHEME CONTROLLED FROM RETURN WATER TEMPERATURE The CZT can be used to control a step controller to sequence, for Set the control output type to:- instance, boilers. In the case of boiler sequence control the system 1 for single stage heating temperature is monitored and controlled from the return water By using an RPW the CZT set value can be set from a remote point.
- Page 9 10/97 9 - 12 DS 2.105 CONNECTION TO A SEPARATE TRANSFORMER IF MORE THAN 10VA IS REQUIRED FROM THE CZT Independent 24V Transformer NOTE: The independent 24V transformer secondary should be fused and must conform to EN 60742. Fig.9 SENSOR AVERAGING (UP TO 4 SENSORS) Fig.10 Set the number of room sensors connected on the Fine Tune Mode.
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Page 10: Maintenance
DS 2.105 10 - 12 10/97 MAINTENANCE A periodic system and tuning check of the control system is The controller must be located as far away as possible (minimum recommended. 150mm) from any contactors or switches and their cables. This is to avoid any interference to the controller. - Page 11 10/97 11 - 12 DS 2.105...
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Page 12: Dimension Drawing
Telephone +44 (0)1753 550550 for details. Facsimile +44 (0)1753 824078 © 1997 Satchwell Control Systems Limited (revised October 1997) A Siebe Group Company All rights reserved. Unauthorised copying of any part of the contents is prohibitied. Printed in England. 10/97...
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