Sub-Zero SZ-CR2 Manuale utente

SZ-CR2

DUAL SET POINT COLD ROOM

CONTROLLER

Instruction Manual

SZ-CR2 1

Index

Parameter

Description

Page No.

Introduction

Technical Data

User Interface

How to change the Parameter Value

Set Mode

Set Point for Compressor1 Relay.

Set Point for Compressor2 Relay.

End Programming in Set Mode.

Program Mode

Compressor Selection.

High Temperature Alarm Set Point for Control (Main)

Probe.

Low Temperature Alarm Set Point for Control (Main)

Probe.

Maximum Set Point Limit.

Minimum Set Point Limit.

Differential for Compressor.

Control (Main) Probe Calibration.

Time Delay between Compressor Relay Restart.

Minimum ON Time for Compressor Relay.

Compressor Relay status in Sensor Fail Condition.

Compressor relay OFF Time during Sensor Fail Condition.

Compressor relay ON Time during Sensor Fail Condition.

To select simultaneous or either defrosting of Two

Compressors.

Type of computation for Defrost Time Duration.

Defrost duration for Compressor1.

Defrost duration for Compressor2.

Defrost Frequency for Compressor1.

14-15

Defrost Frequency for Compressor2.

Power ON Defrost Delay for Compressor1.

Power ON Defrost Delay for Compressor2.

Activate/Deactivate Door Open Digital Input.

Fault Sensing Delay for Door Open Digital Input.

Output status on Door Open Fault.

Delay time for Temperature updating Door Open Digital

Input Fault.

Time duration to start Compressor with High Set Point.

16-17

SZ-CR2 2

Index

Parameter

Description

Page No.

Minimum ON/OFF time between two Compressors.

Time interval at which the Set Point for Compressors will

get interchanged.

Set Point Interchange on Fault.

Activate/deactivate HP Fault Digital Input for Compressor1.

Compressor1 HP Fault Digital Input sensing delay.

Reset mode for Compressor1 output, on Compressor1 HP

Fault Digital Input.

18-19

No. of retrials of Compressor1 HP Fault Digital Input.

Activate/deactivate Compressor1 LP Fault Digital Input.

Compressor1 LP Fault Digital Input Sensing Delay. (Surge)

Compressor1 LP Fault Digital Input Sensing Delay. (Normal)

Reset mode for Compressor1 output, on Compressor1 LP

Fault Digital Input.

No. of retrials of Compressor1 LP Fault Digital Input.

Activate/deactivate Compressor1 SPP Fault Digital Input.

Activate/deactivate Compressor2 HP Fault Digital Input.

Compressor2 HP Fault Digital Input sensing delay.

Reset mode for Compressor2 output, on Compressor2 HP

Fault Digital Input.

No of retrials of Compressor2 HP Fault Digital Input.

To activate/deactivate Compressor2 LP Fault Digital Input.

Compressor2 LP Fault Digital Input Sensing Delay. (Surge)

Compressor2 LP Fault Digital Input Sensing Delay. (Normal)

Reset mode for Compressor2 output, on Compressor2 LP

Fault Digital Input.

23-24

No of retrials of Compressor2 LP Fault Digital Input.

Activate/deactivate Compressor2 SPP Fault Digital Input.

Time delay to switch OFF the Light.

Enable/Disable Light Relay ON at Door Open.

Clear Compressor1 Run Hours.

Clear Compressor2 Run Hours.

Clear Fault Log

Display during Defrost.

Default (Normal) Display.

Display Delay.

Activate Alarm Relay.

Ht or Lt Alarm Power ON Delay.

Time Delay to activate Alarm Relay at Door Open.

SZ-CR2 3

Index

Parameter

Description

Page No.

Power Status

Set display at Power OFF Mode

Temperature unit selection in °C or °F.

Controller Resolution.

Change Password.

Keypad Lock.

28-29

To restore Default Settings of the Controller.

To end Programming.

Run Hour and Fault Logs

Compressor1 Run Hours.

Compressor2 Run Hours.

Balanced t4 Interchange duration.

Balanced defrost frequency for Compressor 1.

29-30

Balanced defrost frequency for Compressor 2.

View last 10 Fault Log.

End of Programming.

LED Indications

31-32

Fault Messages

32-33

Operating Messages

Password Function

High and Low Temperature Logging Function

Wiring Diagram

Caution for you Safety

SZ-CR2 4

Introduction:

The SZ-CR2 is a Two-Compressor Controller with separate Set Points for each

Compressor. They are specifically designed for Refrigeration applications wherein the

Compressor cuts off at Set Point and is restarted at a Temperature of Set Point plus

Differential. Amongst other features, an important one is that in case one Compressor

is not capable of handling the load, the second Compressor will activate and both

Compressors will cutout at the lowest Set Point.

Features:

•The operation is very user friendly and is easily understood with the examples in the

instructions below.

•Various parameters help set up the instrument functions for different applications.

•The SZ-CR2 can be used for applications with a measuring range from -45.0⁰C to

70.0⁰C.

•Defrost Application

•Cycling of Compressors so that there is no overload on one Compressor.

SZ-CR2 5

Technical Details

Housing : ABS Plastic

Dimensions : Front: 210 X 160 mm, Depth: 41.1 mm

Mounting : Wall Mount

Connections : Screw terminal blocks.

< 2.5sq mm terminal only.

Display : 3 X 33mm (1.3”) 7 segment display

Keys : 6 Tactile keys

Data storage : Non-volatile EEPROM memory.

Power input : 230Vac, +/- 10%, 50-60Hz Standard.

Relay output : Comp1 Relay 10A, 230V AC

Comp2 Relay 10A, 230V AC

Light Relay 10A, 230V AC

Alarm Relay 5A, 230V AC

Operating temp. : 0°C to 60°C (non-condensing)

Operating humidity : 20% to 85% (non-condensing)

Storage temp : -25.0°C to 60.0°C (non-condensing)

Measuring Range : -45.0°C to 70.0°C (when rS=0.1)

-45°C to 70°C (when rS=1)

-49°F to 158°F

Input : NTC Control Probe, SZ-T75

Digital Input : 230V operated for Compressor 1

HP (High Pressure Input),

LP (Low Pressure Input),

SPPR Input

230V operated for Compressor 2

HP (High Pressure Input),

LP (Low Pressure Input),

SPPR Input

Door Open Fault (Potential Free)

Resolution : +/- 1°C / 0.1°C / 1°F (Selectable)

Accuracy : +/- 1°C / 1°F

SZ-CR2 6

User Interface:

Keys

Description

Press for 500 milliseconds to Mute Alarm.

Press for 2 seconds to Manual Reset (HP1, LP1, HP2, LP2) Faults.

This key is used to exit from Program Mode / Set Mode / Run Hours

and Fault Log Mode.

Press for 1 seconds to view High/ Low Temperature Logging.

Used to increment parameter values in Set Mode and Program Mode

and scroll through parameters.

Press for 2 seconds to enter in Program Mode.

Used to decrementparameter values in Set Modeand Program Mode

and scroll through parameters.

Press for 2 seconds to enter in Set Mode.

To set and save parameters values in Set Mode and Program Mode.

In High/Low Temperature Logging Mode press for 2 seconds to reset

high / low Temperature logged values.

Press for 1 second to ON / OFF Light.

Press for 2 seconds to Power ON / OFF the Controller.

Press for 2 seconds to enter in Run Hours and Fault Log Mode.

Press for 2 seconds to Start / Stop Manual Defrost of Compressor1.

Press for 2 seconds to Start / Stop Manual Defrost of Compressor2.

Press and hold to see control probe Temperature if default display

(nd) is other than Pr1.

Note: If controller is in Set Mode/Program Mode/Run Hour and Fault Log Mode, in case

of inactivity of keys, it will return to parameter view mode in 30 seconds and will return

to Main screen in next 30 seconds.

SZ-CR2 7

How to Change the Parameter Value:

In Set Mode:

Press and hold key for 2 seconds and release. Display will show ‘SP1’. To go to other

parameters, use keys. After desired value, press the SET key & you will see

“- - -” which confirms that the parameter value has been stored in memory.

In Program Mode:

Press and hold key for 2 seconds and release. Display will show ‘CS’. To go to other

parameters, use keys. After desired value, press the SET key & you will see

“- - -” which confirms that the parameter value has been stored in memory.

Min: MINIMUM Max: MAXIMUM

Fac: FACTORY SETTING (DEFAULT)

Description of Parameters and Functions

Set Mode

Sr. No.

Parameter

Parameter Setting Method

Function: To set Cut OFF Set Point for Compressor1

Relay.

In this mode Compressor1 will be ‘ON’ if the Control

(Main) Probe Temperature reaches or goes above

‘‘Set Point + Differential” (SP1 + P4) and Compressor1

will be ‘OFF’ if Control (Main) Probe Temperature

reaches or goes below Set Point (SP1).

Example:

When Set Point1 is 0.0°C and Differential is 2.0°C. If

the Control (Main) Temperature reaches or goes

above 2.0°C (0.0°C + 2.0°C), Compressor will be ON.

Compressor will be OFF when Control (Main)

Temperature reaches or goes below 0.0°C.

Note:

This parameter is considered only if, CS not equal to

C2.

rS = 0.1

In °C

Min.

Max.

Fac.

(LS+1.0)°C

(HS-1.0)°C

0.0°C

rS = 1

In °C

Min.

Max.

Fac.

(LS+1)°C

(HS-1)°C

0°C

CF = F

Min.

Max.

Fac.

(LS+1)°F

(HS-1)°F

32°F

SZ-CR2 8

Function: To set Cut OFF Set Point for Compressor2

Relay.

In this mode Compressor2 will be ‘ON’ if the Control

(Main) Probe Temperature reaches or goes above

‘‘Set Point + Differential” (SP2 + P4) and Compressor2

will be ‘OFF’ if Control (Main) Probe Temperature

reaches or goes below Set Point (SP2).

Example:

When Set Point2 is 0.0°C and Differential is 2.0°C. If

the Control (Main) Temperature reaches or goes

above 2.0°C (0.0°C + 2.0°C), Compressor will be ON.

Compressor will be OFF when Control (Main)

Temperature reaches or goes below 0.0°C.

Note:

This parameter is considered only if CS is not equal to

C1.

rS = 0.1

In °C

Min.

Max.

Fac.

(LS+1.0)°C

(HS-1.0)°C

0.0°C

rS = 1

In °C

Min.

Max.

Fac.

(LS+1)°C

(HS-1)°C

0°C

CF = F

Min.

Max.

Fac.

(LS+1)°F

(HS-1)°F

32°F

Function: To end Programming in Set Mode.

To end programming

press "SET" key.

Once the key is pressed, the Controller goes into the

Normal Mode and displays the Temperature and all

settings are recorded.

SZ-CR2 9

Min: MINIMUM Max: MAXIMUM

Fac: FACTORY SETTING (DEFAULT)

Description of Parameters and Functions

Program Mode

Sr. No.

Parameter

Parameter Setting Method

Function: Compressor Selection.

This parameter is used to decide either both

Compressors are working or only single Compressor is

working.

Note: Compressor related parameters are applicable

for both Compressors depend on CS parameter setting.

If this parameter is set to,

(0)

= Select Compressor1.

(1)

= Select Compressor2.

(2)

= Select both Compressors.

(3)

= One working One Standby.

Min.

Max.

Fac.

Function: To Set High Temperature Alarm Set Point for

Control (Main) Probe.

Example: If this parameter is set to 50.0⁰C and the

Control (Main) Probe Temperature reaches or goes

above 50.0⁰C, display will show Ht (High Temp.)

indicating that the Temperature has reached or gone

above the value set in this parameter. Differential of

1.0⁰C is considered for clearing the fault.

Where, P3 = Low Temperature Alarm Set Point.

(Message on Display)

rS = 0.1

In °C

Min.

Max.

Fac.

(P3+1.0)°C

50.0°C

rS = 1

In °C

Min.

Max.

Fac.

(P3+1)°C

50°C

CF - F

Min.

Max.

Fac.

(P3+1)°F

122°F

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