Guardian RCC-12 User guide

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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

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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

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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.

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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.

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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

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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

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

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

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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

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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

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
Default Displays
The default suction pressure display
Suct =2.3b Suction pressure (-1 to 24barG)
is during AUTO or restart sometimes replaced by
8888 During restart
6PAC Unit model configuration selected
u1.1A (Software version)
-OFF If unit selected OFF
HAnd If unit selected hand control
=PC= FAiL if RS485 comms watchdog fail
TRIPS AND ALARMS
COMPRESSOR SAFETY TRIPS
ALL Trips are RESET locally by pressing the 'enter' button.
The last safety trip input detected is automatically displayed with a flashing alternative 'triP'
message.
The 'next' button may always be used to view other displays.
Trip messages displayed depend on the unit model and the configuration selected.
Analogue Trips
Suct =oc= FAIL Suction pressure open circuit (6PAC or 8PAC)
Suct 10.5 triP Suction pressure high trip

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
ALARMS
Analogue Alarms
If the suction pressure, amps liquid level or superheat values go outside the high or low
alarm limits then the appropriate value is displayed with a flashing alternative 'Hi' or 'Lo'
alarm message.
Suct -0.8 ==Lo Suction Pressure Low alarm
Suct 10.8 Hi== Suction Pressure High alarm
LoAd =120 Hi== Motor Load High alarm - also unloads pack
Digital Alarms
Digital alarm messages include:-
Lo-A Leu= Digital input Low level liquid alarm 30 min time
delay
C-1
triP
Compressor 1 Tripped. The run input was not
present for 3 successive starts.
PC-FAIL ALARM
If the RCC12 unit is in 'Auto' mode and a valid status request has not been received for 60
seconds via the RS485 highway then a Watchdog timer 'PC/FAIL' message is displayed.
This alarm is reset if 485 communications are restored or the AGT/SYS5/Locl/nonE is set to
'LocL' or 'nonE' in unit settings.
=PC= FAIL if RS485 comms watchdog fail
MODE CHANGE Compressors
Pressing 'next' until the pack mode selections are on display and then pressing 'enter'
changes the pack mode to the new selection displayed.
Auto AUTO pack control mode with compressor control
on suction pressure
oFF= -OFF = pack control stopped - (standby operation)
hAnd hAnd = pack control in local manual operation

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
Pack Capacity Manual
With the pack mode selected to HANd, the pack capacity can be increased or decreased by
pressing 'raise' or 'lower' buttons when the pack capacity is on display.
@:@ HAnd ?
@:@ CAP= ==50 /:/ ==75 ?
GLOBAL RS485 COMMANDS
IF all compressors are tripped or the unit is in 'OFF' mode and Trip Settings are 'CoFF' then
a GLOBAL RS485 'OFF'command is sent to all case controllers on the same section of
RS485 Highway to prevent liquid floodback.
A GLOBAL RS485 'AUTO' command is sent on restart, when trip 'reset' is pressed or when
control mode is selected 'AUTO'.
A GLOBAL RS485 TIME synchronisation command is sent to all case controllers twice per
day if Agt/SYS5/Locl/nonE protocol selected is 'LocL'

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
USEFUL BUTTON SEQUENCES
The following button sequences should prove useful during normal service operation
Reset ALARM or TRIP
diFF triP ? =2.4b
RESET
Change suction control setpoint and differential
@:@ SEt= ? PP00 /:/ PP05
@:@ cprs ?
@:@ c2.0b /:/ c2.5b ? c2.5b
@ cd01 /:/ cd02 ? cd02
@:@ End= ? =2.6b ?
Check Unit Model
@:@ SEt= ? PP00 /:/ PP05 ?
@:@ Unit ? 3PAC This unit model is ’3PAC’
@:@ End= ? =2.6b
Select Stub, Case No and Address
e.g. setup unit for system 60, case 1, at address 180
@:@ SEt= ? PP00 /:/ PP05
@:@ unit ?
@:@ Sn01 /:/ Sn60 ? Sn60
@ Cn01 ? Cn01
@ A001 /:/ A180 A180
@:@ End/ ? =2.6b

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
SETUP OPERATION
Setup operation lasts for a maximum of 5 minutes after being activated by pressing ?
with CSEt or FSEt on the display panel.
On entry to Setup passcode PP00 is displayed.
To change any settings passcode PP05, PP09 or PP11 must be first selected using /
and ?pushbuttons.
If the correct passcode is not entered then setup values may be displayed but any attempted
changes are ignored.
Compressors Settings Level 2
CSEt CSEt Press ?
PP00 PP00 Set passcode PP05, PP09 or PP11 by
using the
/and < pushbuttons
PP05 ?PP11 Press ?
PP11 menu page 21
PP05 Compressor menu page 16

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
Setup Functions (Normal) passcode 05
PP05 Menu
Press @to sequence through the following PP05 Menu selections:-
Press ?to select the displayed menu
Compressors
Unit Unit Unit model setup RCC-12
Page 17
CPRS CPrS Compressor setup
Page 18
Delay dELY Compressor delay timers
Page 18
Suction Suct Suction pressure alarm levels
Page 19
Trip triP Trip inputs and control
Page 19
Size SIZE Compressor sizes
Page 19
Load LOAd Amps high alarm
Page 20
Test tESt Force relays on/off
Page 20
End End= Return to suction pressure display

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
Compressor Settings
Unit
Unit
UnitUnit
Unit Press @to sequence through Setup selections
Press /
//
/or <to change the settings
Press ?
??
?to accept the settings
Unit Model YYYY YYYY = 6PAC - 6 pack compressor
8PAC - 8 pack compressor
Std No selection RCC-12
System number Snnn nn = 1 - 255
Monitor Address Annn nnn = 1 - 255
RCC-12 units require 12 addresses in sequence
Comms protocol YYYY YYYY = Agt - Autograph terminal PC
SYS5 - Woodley Sys 5 With 12 addresses
SYS6 - Woodley Sys 5 With only 1 address
LocL - Local highway only
nonE - If 'Locl' or 'nonE' is selected the 'PC
FAIL' message is not displayed
Alrn - Alarm, digital output, for use with
external relay fitted to unused Comms terminals.
Oil Level Alarm
Action OILy If y=a when low oil level is present for 10 mins alarm
is generated.
If y=t then after 10 mins compressors are stopped
and alarm generated

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
CPrS
CPrs
CPrsCPrs
CPrs Press @to sequence through Setup selections
Press /
//
/or <to change the settings
Press ?
??
?to accept the settings
Pack suction control
setpoint c=2.1 n.n = -0.6 to 5.0
Control deadband dbn.n nn = 0.1 to 1.0
Satellite compressor
selection YYYY YYYY = SAtC noSC - No satellites allowed on 6PAC or
8PAC
Loading valve polarity YYYY YYYY = LPoS - Positive
LnEG - Negative
Fast response
deadband FbYY yy = 0.1 to 2.0
Stage up control
algorithm CAuu u = 0 - 9
Stage down control
algorithm CAdd dd = 0 - 9
u/d determines rate of response when outside fast deadband with
relation to amount of error from setpoint.
Stage time = stage-delay - (stage-delay x error from setpoint) /
Control Algorithm
dELY
dELY
dELYdELY
dELY Press @to sequence through Setup selections
Press /
//
/or <to change the settings
Press ?
??
?to accept the settings
Control delays
Starts per hour SHnn nn = 2 -15
Stage up delay Sun.n n.n = 0.2 - 9.9 mins
Stage down delay Sdn.n n.n = 0.2 - 9.9 mins
Start Period delay SPnn n.n = 0 - 60 seconds. Time delay for run input.

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
Suct
Suct
SuctSuct
Suct Press @to sequence through Setup selections
Press /
//
/or <to change the settings
Press ?
??
?to accept the settings
Suction pressure low
alarm limit L=n.n n.n = -1.0 to 5.0 bar
Suction pressure high
alarm limit Hnn.n nn.n = 0.0 to 20.0 bar
Suction pressure high
alarm guardtime Ht00 = 00 to 99 mins
triP
triP
triPtriP
triP Press @to sequence through Setup selections
Press /
//
/or <to change the settings
Press ?
??
?to accept the settings
Number of trip
inputs/compressor ntc1 Always for RCC-12
GLOBAL-RS485
command action after
all compressors
trippped OFF
Cyyy CoFF= Cases OFF on highway section
CnoA= Cases no Action on trip
SIZE
SIZE
SIZESIZE
SIZE Press @to sequence through Setup selections
Press /
//
/or <to change the settings
Press ?
??
?to accept the settings
Size 1st compressor 1Cnn nn = 1 - 99
Size 2nd compressor 2Cnn nn = 1 - 99
etc
Size 6th compressor 6Cnn nn = 1 - 99
Size 8th compressor 8Cnn nn = 1 - 99

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GUARDIAN RCC-12 Issue vE-1.2A 03/08/00
If fitted
Number of sizes displayed depends on unit model
Size 0 means no compressor fitted
LOAd
LOAd
LOAdLOAd
LOAd Press @to sequence through Setup selections
Press /
//
/or <to change the settings
Press ?
??
?to accept the settings
High total current
alarm level Hnnn nnn = 100 to 250
Low total current
alarm level Lnnn nnn = -0.1 to 99
tESt
tESt
tESttESt
tESt Press@to sequence through the relay selections
Repeatedly press ?
??
?to switch the relays on and off
Relay R1 1OFF 1=on Compressor 1
Relay R2 2OFF 2=on Compressor 2
etc
Relay R7 7OFF 7=on System Healthy
Extension relay 1 A=on AoFF Compressor 7
Extension relay 1 b=on boFF Compressor 8
End
End= Exit settings change and return to default compressor display