Guardian RCC-12 User guide

Page 1
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
GUARDIAN
RCC-12
Reciprocating Compressor Controller
for coldstores and supermarkets
•Suction pressure setpoint control of up 8 uneven/even compressors
•Compressor monitor with capacity, pressure & hours run displays
•Alarm, trip & load monitoring
•Local panel operation & setup of timers, limits and configuration
•Remote RS485 monitoring and setup
Operation and Setup Manual
The GUARDIAN RCC-12 Reciprocating Compressor Controller provides suction pressure
setpoint control and alarm monitoring for up to 8 even or uneven size compressors.
The controller communicates with the GUARDIAN Autograph Terminal and the Woodley
System 5 which provide remote central alarm monitoring, data recording and graphs.
Local temperature displays and modification of all defrost times, alarm and control settings is
available when the unit is connected to the optional GUARDIAN SKD-9 Keyswitch display.
GUARDIAN
Tel. [phone]
Fax. [phone]
Email: [e-mail]
www.Guardian-controls.com

Page 2
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
CONTENTS
GUARDIAN RCC-12 ...............................................................................1
RECIPROCATING COMPRESSOR CONTROLLER................................................. 1
GETTING STARTED.................................................................................................. 3
SKD.9 KEYSWITCH DISPLAY OPERATION.................................................................................... 3
BUTTON OPERATION SHORTHAND................................................................................................ 4
HARDWARE CONFIGURATION CHECKS ........................................................................................ 4
CONFIGURE UNIT MODEL, SYSTEM No & ADDRESS...................................................................5
5Unit Enter Passcode PP05 for normal changes............................................................................. 5
Select Model ....................................................................................................................................5
Select System No and Address .......................................................................................................5
RS485 Communications..................................................................................................................5
UNIT MODELS........................................................................................................... 6
Available unit models (RCC-12)...................................................................................... 6
GENERAL SPECIFICATION ............................................................................................. 6
RCC-12 ‘6PAC’ and ‘8PAC’ Input/Output Signals........................................................... 6
RCC.12 6PAC................................................................................................................... 7
RCC-12 Termination Wiring - ‘6PAC’ model selection ................................................ 7
RCC.12 8PAC.................................................................................................................... 8
RCC-12 Termination Wiring - ‘8PAC’ model selection ................................................ 8
OPERATION............................................................................................................... 9
DISPLAY INDICATIONS.................................................................................................. 10
Compressor Displays.....................................................................................................................10
Default Displays.............................................................................................................................11
TRIPS AND ALARMS...................................................................................................... 11
COMPRESSOR SAFETY TRIPS ................................................................................. 11
Analogue Trips.......................................................................................................... 11
ALARMS....................................................................................................................... 12
Analogue Alarms....................................................................................................... 12
Digital Alarms............................................................................................................ 12
PC-FAIL ALARM....................................................................................................... 12
MODE CHANGE Compressors .................................................................................... 12
Pack Capacity Manual .............................................................................................. 13
GLOBAL RS485 COMMANDS..................................................................................... 13
USEFUL BUTTON SEQUENCES ................................................................................ 14
Reset ALARM or TRIP.................................................................................................. 14
Change suction control setpoint and differential............................................................................14
Check Unit Model...........................................................................................................................14
Select Stub, Case No and Address................................................................................................14
SETUP OPERATION............................................................................15
Setup Functions (Normal) passcode 05....................................................................... 16
PP05 Menu...................................................................................................................... 16
Compressor Settings..................................................................................................... 17
PP11 Menu - SETTINGS LEVEL 2.................................................................................. 21
COMPRESSORS......................................................................................................... 21
COMMUNICATIONS.............................................................................22
CONSULTANT DISPLAYS.............................................................................................. 23
SETUP / COMMISSIONING PARAMETERS........................................24
PP05 Normal Menu Compressor Settings.....................................................................................24
PP11 Menu - Settings Level 2........................................................................................................26
INDEX...................................................................................................27

Page 3
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
Getting Started
Guardian Controllers provide refrigeration engineers with
•ULTIMATE FLEXIBILITY
•ASSURED MONITORING
•RELIABLE ALARMS
This manual provides refrigeration designers, installers, service mechanics and supermarket
personnel with the necessary information to achieve the above objectives.
All users require to know a few basic facts about this controller before successfully starting
to perform their design, commissioning, maintenance or operating functions.
a) All GUARDIAN controllers need to be set up with a unit model selection and other basic
settings for setpoints, timers and addresses. All these settings need to be done using the
SKD.9 Keyswitch Display, so the understanding of the button operation of this unit is
essential.
b) The shorthand used in the following chapters for concisely expressing button pressing
and selection sequences to do all this setup needs to be understood.
c) Mains power input voltage and hardware switch and link option selections (if any are
required) must correspond to the selected unit model configuration.
d) Since each controller can be configured in a number of different ways to perform flexible
refrigeration control then an understanding of how to find out what unit model is currently
selected, what it does and how it is connected, is also necessary.
SKD.9 KEYSWITCH DISPLAY OPERATION
GUARDIAN controllers require a SKD.9 Keyswitch Display unit to be plugged into the
telephone jack socket in the controller before any settings can be changed.
The SKD.9 is connected to the GUARDIAN controller via a 6-core telephone cable.
The SKD.9 Keyswitch/Display comprises a plastic enclosure housing a PCB with four
membrane pushbuttons, four LED displays and a 2-position Keyswitch.
SKD.9 buttons have the following functions when pressed:
@
@@
@’next’ button displays next value or menu selection in sequence.
/
//
/’raise’ button raises a menu settings value or menu item selection.
<
<<
<’lower’ button decreases a menu settings value or item selection.
?
??
?’accept’ or ‘enter’ button accepts any alarm and is used for entering a
menu selection or settings value data entry
The two position keyswitch may be used to toggle display case control status from OFF to
FANS only and back to AUTO
The Keyswitch is not used on the RCC-12.

Page 4
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
BUTTON OPERATION SHORTHAND
To assist in easy setup of control setpoints, delays, timers and other configuration settings,
the sequence of button presses and subsequent displays will be shown in this handbook as
below:
ii) A button symbol means press that button
iii) A display box shows the result of the last button press on the SKD.9 display.
EXAMPLES
@ Auto @ OFF= ? -OFF is shorthand
for
Press ‘next’ button which then displays AUTO
Press ‘next’ button which then displays OFF
Then press ‘enter’ button which changes the control mode to OFF and displays -OFF
@:@ Auto ?
Press ‘next’ repeatedly until Auto is displayed then press ‘enter’.
Suct 4.8b
means the display alternates between the value identifier tag and the latest value.
DiSc =Oc= FAIL
means the display alternately flashes between the value identifier tag (discharge
temperature), the measured value ( open circuit ) and the alarm or trip message.
HARDWARE CONFIGURATION CHECKS
Prior to switching on the GUARDIAN controller check that the hardware unit is the correct
type for the incoming mains voltage
Models with BLUE labels and suffix ‘L’ (LOW VOLTAGE) operate at 24vac
Models with BLACK labels and no suffix ( NORMAL 230vac) operate at 230vac
230vac MAINS SUPPLY WILL DAMAGE A BLUE LABEL CONTROLLER !!!
A BLACK label controller will not work with a 24vac supply
When satisfied that the correct type of controller is available then the following checks
should be made prior to controller installation or replacement
a) Ensure mains supply is wired correctly to the appropriate TERMINAL WIRING drawing for
the model selected.
b) Ensure that any transducer selector switches specified on the TERMINAL WIRING
diagram are in the correct state.
c) Ensure any shorting link selector pins specified on the TERMINAL WIRING diagram are
correctly fitted.
d) Ensure that probes are wired to the terminal WIRING DIAGRAM and the correct type of
thermistor or pressure transducer probes are fitted.
e) The SKD.9 Keypad/display unit is fitted correctly in its 6 way telephone socket.
f) The RS485 highway connections (if required) are wired to the correct terminals and the
screen drain wire is continuous to earth.

Page 5
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
CONFIGURE UNIT MODEL, SYSTEM No & ADDRESS
Enter Passcode PP05 for normal changes
Before any permanent change of controller settings are made then the correct entry of the
appropriate passcode is necessary.
Most normal system settings require entry of passcode PP05
@:@ SEt= ? PP00 @:@ PP05 ?
Press ‘next’ repeatedly until SEt is displayed then press ‘enter’. PP00 is displayed.
Press ‘raise’ repeatedly until PP05 is displayed and then press ‘enter’.
Select Unit Model
@:@ SEt= ? PP00 /:/ PP05 ?
Enter Passcode PP05 as button sequence above
@:@ Unit ? 8PAC /:/ 6PAC ? 6PAC
Press ‘next’ repeatedly until Unit is displayed and then press ‘enter’
Display shows unit model currently selected which may be wrong.
Press ‘raise’ repeatedly until correct model is displayed (e.g. 6PAC) and then press ‘enter’
which causes the display to wink briefly and display the new unit model selection
(e.g 6PAC)
Select System No and Address
e.g. setup unit for system 60 case 1 at address 180
Enter Passcode as button sequence as above
@:@ Unit
@:@ Sn01 /:/ Sn60 ? Sn60
@ Cn01 ? Cn01
@ A001 /:/ A180 A180
@:@ End= ? =-26
RS485 Communications
When the correct system number, case/compressor number and highway address have
been entered as above then the controller can communicate with the GUARDIAN AutoGraph
Terminal PC for central alarm monitoring and temperature display. Control setpoints, defrost
times and alarm limits may then be sent to the controller from the PC rather than using the
SKD9 Keyswitch display. For further details see page 22

Page 6
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
UNIT MODELS
Guardian controllers may be configured in a number of different ways dependent on unit
model selection. Each unit model fulfils a different refrigeration temperature monitoring and
control requirement. In order to perform the required refrigeration control then each model
has different uses for the controller’s input output signals. This section gives details of all the
model variations available for the controller and the way to connect the wiring to the plant
devices and measuring transducers.
Available unit models (RCC-12)
RCC-12 ‘6PAC’ Compressor Control
RCC-12 ‘8PAC’ Compressor Control
GENERAL SPECIFICATION
Power 110 / 230 Vac 50 Hz 10VA
Operation 0 to 55ºC
Approx. dimensions Width 70 x length 100 x height off rail 110mm.
The RCC-12 controller is housed in a DIN rail mounting enclosure with 20 screw clamp
connectors.
RCC-12 ‘6PAC’ and ‘8PAC’ Input/Output Signals
6PAC 8PAC
Analogue Inputs
Motor Amps Motor Amps Motor 01 0-1 amp
P1 P1 Suction Pressure 4 to 20ma 1 to 24 bar g
Digital Inputs 230 /24 Vac
Trip 1 Trip 1 Any Compressor trip
Trip 2 Trip 2 Liquid Alarm Level
Trip 3 Trip 3 Oil Level Alarm
Trip 4 Trip 4 Condenser Fan Trip
Trip 5 Trip 5 Spare
Trip 6 Trip 6 Spare
Relay Outputs (5 amp 230 /24Vac) n/o with suppressers
R1 to R4 R1 to R4 Compressor 1 to 4

Page 7
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
RCC.12 6PAC
RCC-12 Termination Wiring - ‘6PAC’ model selection
Compressor Control

Page 8
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
RCC.12 8PAC
RCC-12 Termination Wiring - ‘8PAC’ model selection
Compressor Control

Page 9
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
OPERATION
The SKD.9 Keyswitch display provides a display at the control panel of:
Compressor suction pressure
Condenser discharge pressure.
Display of other temperatures pressures etc by pressing ’next’ @button,
the values displayed depend on the unit model selected.
The keyswitch. Is not used on the RCC12
Passcode protected setup of controller setpoints, timers and limits.
Alarms and trips are reset by pressing accept
next raise lower enter keyswitch

Page 10
GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
DISPLAY INDICATIONS
Compressor Displays
The following displays are available by repeatedly pressing @Value displays are
alternated with an identification Tag (ie 'Suct') which is displayed for a quarter time:-
All pressures are followed by ‘b’ to denote bar guage
Tag Value
Suct =2.3b Suction pressure (-1 to 24barG)
LoAd =125 Total pack amps
CAP= =100 Total Pack Capacity % (0 to 100 %) (capacity
raise/lower operative in HAnd control mode)
S-uP =3.5 Stage up timer count
S-dn =0.3 Stage down timer count
Auto Pack Auto control mode (press 'accept')
OFF= Pack OFF control mode (press 'accept')
hAnd HANd control mode (press 'accept')
(enables raise/lower buttons)
CPrS 1=11 Compressor motors run output on
deLy =1== Compressor anti-short cycle delay timing
Crun 1=11 Compressor run signal received
triP ==11 Motor trip status
CSEt Request compressor parameter change
COMPRESSOR SETTINGS MAY ALSO BE SELECTED BY PRESSING 'Raise' with 'Suct'
on display