WURM CRC-XP - User Manual

Cold location controller for conventional plants, up to 4 control circuits (evaporator)
CRC-XP_V2.92_PI_2019-03_EN 1
Subject to technical modifications
CRC-XP
1 CRC-XP
Cold location controller for conventional plants, up to 4 control circuits (evaporator)
Fig. 1: Front view
1.1 Features
• Control functions for 4 control circuits/evaporators
• Suitable for all cold locations, such as cold rooms and refrigeration units
• Basic functional sequences and parameters preprogrammed through selection of cold location
type
• Operating modes for three-point control
• 2nd setpoint by digital input
• Different weightings selectable for 2 control sensors in day and night operation
• Intelligent fan control
• Thermal fan control and draining time after defrosting
• Suitable for electric, forced air, hot gas and cool gas defrosting
• Defrost control by real-time clock with power reserve
• Simple defrost synchronisation of multiple controllers (master-slave)
• For 8 defrost times, daily or only every xth day. Day
• Plug-in screw terminals
• Large data memory for temperature list
• Direct connection of a CAN-USB to the service socket
• Connection to the Wurm system through a Wurm CAN communication bus (C-BUS) and
FRIGODATA XP

Summary

CRC-XP Controller

Features

Lists control functions, suitability for cold locations, and operating modes.

Safety Instructions

Provides writing conventions and critical safety warnings for operation and installation.

Circuit Diagram and Connections

Illustrates the C-BUS interface, output relays, and terminal connections for sensors and inputs.

Installation and Technical Data

Details module installation for top-hat rail and provides comprehensive technical specifications.

Overview

1. Function Description
2. Important Technical Specifications
3. Usage Features
4. Maintenance Features

The CRC-XP is a cold location controller designed for conventional plants, capable of managing up to four control circuits, typically evaporators. This device is suitable for various cold locations, including cold rooms and refrigeration units.

Function Description:

The CRC-XP provides comprehensive control functions for up to four evaporators. It comes with preprogrammed basic functional sequences and parameters, which can be selected based on the specific cold location type. The controller supports three-point control operating modes and allows for a second setpoint to be activated via a digital input. It offers flexible weighting options for two control sensors during day and night operation.

Intelligent fan control is a key feature, including thermal fan control and a draining time after defrosting. The device supports various defrosting methods, such as electric, forced air, hot gas, and cool gas defrosting. Defrost control is managed by a real-time clock with power reserve, ensuring accurate timing even during power outages. For installations with multiple controllers, simple defrost synchronization (master-slave) is available. The CRC-XP can handle up to eight defrost times, configurable for daily operation or every Xth day.

Important Technical Specifications:

• Power Supply: 230V~, +10% / -15%, approximately 5VA.
• Temperature Sensors: Supports 4 x TRK277, T3000, T2015, DGF, K243, TF 201 / TF 231.
• Digital Inputs: 4 x potential-free.
• Output Relays: 4 x relay 230V~, normally open contacts, 230V~, 4(2)A.
• Temperature Control Method: Thermostat method.
• Defrost Methods: Forced air, electric, hot gas, cold gas.
• Central Unit: Single-chip microcomputer with data memory and a quartz clock providing 5000 hours of power reserve.
• Monitoring System: Monitors connected sensors and performs self-monitoring of data memory and the microcomputer.
• Communication: Features a 3-wire CAN bus interface with integrated power supply, galvanically isolated, and a service socket.
• Dimensions (WxHxD): 106 x 90 x 58mm (DIN 43880).
• Fastening: Designed for top-hat rail installation (TH 35-15 or TH 35-7.5, DIN EN 60715).
• Ambient Temperature: Operation: 0...+55°C, Storage: -25...+70°C.
• Weight: Approximately 450g.
• CE Conformity: Complies with 2014/30/EU (EMC Directive) and 2014/35/EU (Low Voltage Directive).
• EAC Conformity: Complies with TR CU 004/2011 and TR CU 020/2011.
• RoHS II: Compliant.
• Software Version: V2.92-2019-03.

Usage Features:

The CRC-XP is designed for easy installation, fitting into top-hat rail setups. Its standard housing size makes it suitable for installation in fuse boxes or distribution switch boxes, allowing modules to be positioned side by side without gaps. The device features plug-in screw terminals for convenient wiring. For data lines, standard telephone lines (2x2x0.8ø) are recommended for lengths up to 100m, with shielding grounded in the control cabinet. For longer cable runs (100m to 400m), shielded lines with braided sheathing should be used. Sensor extensions also recommend the use of sheathed cable.

The device includes a large data memory for storing temperature lists. Direct connection of a CAN-USB to the service socket is possible, facilitating service and diagnostics. It can also connect to the Wurm system via a Wurm CAN communication bus (C-BUS) and supports FRIGODATA XP, enabling integration into broader control and monitoring networks.

Maintenance Features:

The device is designed for reliability and includes self-monitoring capabilities for its connected sensors, data memory, and microcomputer. In case of a fault or damage, the device should be taken out of operation to ensure safe functioning. Users are advised not to open or repair the device themselves; instead, it should be sent in for repair with an exact description of the fault. Regular checks of all wiring after connection and adherence to maximum load specifications on all connections are crucial for maintaining optimal performance and safety. The device's robust design and compliance with various safety and EMC directives contribute to its overall maintainability and long-term reliability. Further information about the device can be found in the Wurm Infocenter.

WURM CRC-XP Specifications