WURM DSC-XP User manual

DSC-XP
Rack control for plants with digital scroll compressors
and integrated condensation pressure control
DSC-XP_V2.3.0_PI_2019-04_EN Subject to technical changes Page 1 of 4
Front view
Features
Control of 1 digital scroll compressor and 2 standard scroll compressors
Voltage control via 0…10V input
Suction pressure shift by switching contact or enthalpy
Constant condensation pressure control by speed regulator
Monitoring of final compression temperature of the digital scroll compressor
Individual monitoring of temperature switches of each compressor
Foreign-language front plates available on request
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

DSC-XP
Rack control for plants with digital scroll compressors
and integrated condensation pressure control
Page 2 of 4 Subject to technical changes DSC-XP_V2.3.0_PI_2019-04_EN
Writing conventions
Symbol
Meaning
CAUTION
Avoid the described hazard: Otherwise minor or medium bodily injury or
property damage will result.
WARNING
Avoid the described hazard: Otherwise there is danger from electric voltage that
can lead to death or serious bodily injury.
For your safety
For safe operation and to avoid personal injury and equipment damage through operating error,
always read these instructions, become familiar with the device, and follow all safety instructions on
the product and in this document, as well as the safety guidelines of Wurm GmbH & Co. KG
Elektronische Systeme. Keep these instructions ready to hand for quick reference and pass them on
with the device if the product is sold.
Wurm GmbH & Co. KG Elektronische Systeme accepts no liability in case of improper use or use for
other than the intended purpose.
Target group
This manual is intended for "service technician" personnel.
Intended use
The DSC-XP is a compact rack control for plants with digital scroll
compressors and integrated condensation pressure control.
WARNING
Danger to life from electric shock and/or fire!
Switch off the power to the entire plant when carrying out installation, wiring or removal
work. Otherwise a mains voltage and/or external voltage may still be present even if the
control voltage is switched off. Always remove both power plugs (L and N).
Only qualified electricians are permitted to wire the device.
Use only the correct tools for all work.
Check all wiring after connection.
Take note of the maximum loads on all connections.
Never expose the device to moisture, for example due to condensation or cleaning
agents.

Take the device out of operation if it is faulty or damaged and is therefore compromising
safe operation.
Do not open the device.

Do not attempt to repair the device yourself. If the device requires repairs, send it in with
an exact description of the fault.
CAUTION
Electromagnetic interference can cause faults!
Always use shielded data cables and place them far away from power lines.
Wurm Infocenter
paperless info
Software revisions and validity of documentation
Software version
V2.3.0
2019-04
Documentation status
Any software versions not listed are special solutions for individual projects and are not described in detail in this document.
This document automatically ceases to be valid if a new technical description is issued.
Manufacturer: Wurm GmbH & Co. KG Elektronische Systeme, Morsbachtalstraße 30, D-42857 Remscheid
You can find more information on our website at www.wurm.de

DSC-XP
Rack control for plants with digital scroll compressors
and integrated condensation pressure control
DSC-XP_V2.3.0_PI_2019-04_EN Subject to technical changes Page 3 of 4
Circuit diagram
Installing and connecting
WARNING
Danger to life from electric shock and/or fire!
Switch off the power to the entire plant when carrying out installation, wiring or removal
work. Otherwise a mains voltage and/or external voltage may still be present even if the
control voltage is switched off. Always remove both power plugs (L and N).
This device is designed for top-hat rail
installation. The housing is a standard size and is
also suitable for installation in fuse boxes.
The devices can be positioned next to one
another without gaps.
53
106
90
58

DSC-XP
Rack control for plants with digital scroll compressors
and integrated condensation pressure control
Page 4 of 4 Subject to technical changes DSC-XP_V2.3.0_PI_2019-04_EN
Place the device with the upper guide edge on
the top-hat rail.
Then press the device gently downward until it
engages with the fastening safety catch on the
top-hat rail.
For wiring of the data lines, we recommend the use of standard telephone lines 2x2x0.8ø up to
lengths of 100m. The shielding must be grounded in the control cabinet.
For cable lengths from 100m to 400m, shielded lines with braided sheathing should be used.
For sensor extensions, it is recommended that sheathed cable be laid.
Cable length
Cross section
Up to 100m
0.75mm²
Up to 400m
1.5mm²
Technical data
Power supply
230V~, +10% / -15%, approx. 5VA
Pressure sensor
p
0
and p
c
: -0.5...7bar, 0…25bar, 0…40bar, 0…60bar (each
corresponds to 4...20mA)
Temperature sensor
Final compression temperature thermistor
Control input
0...10V= (for output control in voltage control operating mode)
Digital inputs
Inputs for voltage-free contacts:
1 x setpoint increase (∆T0↑)
1 x fast return (FR)
2 x emergency shutdown Klixon (closed circuit) for scroll compressors
and 1 uncontrolled compressor
Output relay
3 x normally open contacts, 230V~, 4(2)A, rated voltage 230V~
Electronic output
230V~, 4…60VA, note the minimum output!
Residual voltage measureable! Integrated semiconductor
protection (no isolator).
Analogue output
0...10V=, non-isolated, max. load 10mA, for connection of ADC
(multiple contact switch), speed regulator or frequency converter for
condensation pressure control
Central unit
Single-chip microcomputer, data memory
Monitoring system
Monitoring of connected sensors
Self-monitoring of data memory and microcomputer
Communication
3-wire CAN bus interface with integrated power supply, galvanically
isolated, service socket
Dimensions
(WxHxD) 106 x 90 x 58mm (DIN 43880)
Fastening
Top-hat rail TH 35-15 or TH 35-7.5 (DIN EN 60715)
Ambient temperature
Operation: 0...+55°C, storage: -25…+70°C
Weight
About 450g
CE conformity
−2014/30/EU (EMC Directive)
−2014/35/EU (Low Voltage Directive)
EAC conformity
−TR CU 004/2011
−TR CU 020/2011
RoHS II
Valid from
Version 2.3.0