nvent ACS-UIT2, ACS-30 Installation Instructions Manual

ACS-UIT2

WARNING:

IMPORTANT:

Remote User Interface Terminal For nVent RAYCHEM
ACS-30 Systems Installation Instructions

Kit Contents

Qty Description

1 ACS-UIT2 display
4 Elastomeric washers
1 5-ft 9-pin RS-232 (Null Modem) cable
4 Enclosure-mounting tabs

General

Area of use Nonhazardous, Indoors and outdoors

Supply voltage 100 – 240 Vac ±10%, 50/60 Hz
Supply terminal 26 – 12 AWG
Operating temperature –25°C to 50°C (–13°F to 122°F)
Storage temperature –25°C to 80°C (–13°F to 176°F)
Dimensions 386 mm W X 336 mm H X 180 mm D

Alarm Outputs

Relay outputs Three form C relays rated at 12 A @ 250 Vac.

LCD Display

Display LCD is a 8.4 inch XGA, color TFT transflective device

Touch screen 5-wire resistive touch screen interface for user entry.

(IP65, Type 4)

(15.21 in. W X 13.21 in. H X 7.09 in. D)

One relay used for common alarm light. Relays
may be assigned for alarm outputs.

with integral LED backlight

Description

The nVent RAYCHEM ACS-UIT2 is a wall-mounted display
which allows the User Interface Terminal (UIT) to be installed
remotely. The ACS-UIT2 is used with nVent RAYCHEM ACS-30
series control and monitoring systems. The ACS-UIT2 is rated
IP 65 (Type 4), and is approved for nonhazardous indoor and
outdoor locations. These instructions describe how to mount the
ACS-UIT2 on a wall and how to make connections to the User
Interface Terminal and are intended for a qualified electrician.

Tools Required

• Smallflat-headscrewdriver •Phillips(cross-head)screwdriver

• Drill or hole punch for electrical conduit entries

Additional Materials Required

• Wall fasteners for surface mounting (four #1/4-20 bolts)

• RS-485 cable (Belden # 8761 or Carol # C2514)

Approvals

Nonhazardous Locations

LR67275

Network Connection

Local/Remote Port RS-232/RS-485 ports (RS-485, 2-wire isolated)

Local RS-232 A non-isolated, 9 pin D sub male
Remote RS-485 #2 10 pin terminal block, 24–12 AWG

Data rate 9600 to 57600 baud
Maximum
cable length
Field Port RS-485, 2-wire isolated. Used to communicate with

Field RS-485 #1 10 pin terminal block, 0.2 mm to 2.5 mm

Data rate To 9600 baud
LAN 10/100 Base-T Ethernet port with Link and Activity

USB Ports USB 2.0 Host port Type A receptacle (X2)

may be used to communicate with host computers
(ACS-30 Program Integrator) or DCS

(0.2 mm to 2.5 mm

For RS-485 not to exceed 1200 m (4000 ft). Cable
to be shielded twisted pair.

external devices, such as ACS-PCM2-5, ACS-CRM and
RMM2. Maximum cable length not to exceed 1200 m
(4000 ft). Cable to be shielded twisted pair.

(24–12 AWG) wire size

Status LEDs

2

) wire size

2

Fire Hazard: The ACS-UIT2 must not be used
in hazardous locations. Electrical components
within the unit could ignite flammable gases. Do
not install the unit where it may be exposed to
flammable gases.

The ACS-UIT2 is an electronic device. During
installation, take the following precautions to avoid
damage to its electronic components.

• Handle with care to avoid mechanical damage.

• Keep electronics dry.

• Avoid exposure to static electricity.

• Avoid contamination with metal filings, liquids,
or other foreign matter.

• Take care to protect the user interface board on the
enclosure door.

• Use agency-approved conduit bushings,
adapters, and cable glands to keep the
enclosure protected from dust and fluids.

 Mounting the Enclosure

The RAYCHEM ACS-UIT2 controller must be mounted in a nonhazardous indoor or outdoor location. Choose a location indoors or outdoors
where the controller will be protected from the elements and kept above –25°C (–13°F) and below 50°C (122°F). Install the enclosure
using the four #1/4-20 bolts (not provided) in the mounting holes with centers as shown below.

386.4 mm
(15.21 in)

335.6 mm
(13.21 in)

348.3 mm
(13.71 in)

367.3 mm
(14.46 in)

 Electrical Safety

Follow electrical safety procedures when installing and maintaining the ACS-UIT2 unit, as line voltage is present inside.

Back side of UIT

2 | nVent.com

1 2 3

Alarm Relays

Power Supply

Field
RS-485 Ports

Incoming

Power

Remote

 Connecting Main Power

Alarm Relays

 Connecting Main Power

Use only copper conductors for field wiring. A close-up of the
power connection terminals is shown below. This connection
energizes the RAYCHEM ACS-UIT2 electronics only; it does not
provide power to the heat tracing or contactor coils.

Note: If the RAYCHEM ACS-UIT2 user interface has a different
source of power than the heat tracing, it may be worthwhile to
install an uninterruptible power supply (UPS) so the unit can
continue to control and/or monitor the heat tracing in the event
of a localized power failure.

Ø or N
Ø

G

100 – 240 Vac
±10%

The ACS-PCM2-5 and RMM2 communicate with the ACS-UIT2
over an RS-485 network, which may have a total cable length of
1200 m (4000 ft).

The RS-485 communicating cable shall be a shielded, two
conductor (twisted pair) cable.

To downstream devices (ACCS-PCM2-5 and

RS-485 +

RMM2.) Refer to “As Built” drawings for connection

RS-485 –

Shield

5 4 3 2 1

T 9 8 7 6

details. For RS-485 cable type, reference Belden
#8761 or Carol #C2514.

RS-485-2 RS-485-1

RS-485 cable to
RS-485-1 on UIT
(preconnected)

To Remote

Refer to the ACCS-30

Port

Programming Guide
(H58279) and the
ACCS-PCM2-5
Installation Instruction
(H58672) for further
details.

  Connecting RS-485, RS-232 and Ethernet Remote

Port Communication (optional)

These ports are used to communicate to a host computer
or DCS and are user selectable for either RS-485, RS-232 or
Ethernet. If the RS-232 port is utilized, the supplied female to
female, 9-pin null modem adaptor cable must be used.

Optional RS-485 connection

RS-485 +

To DCS or PC

Shield

5 4 3 2 1

T 9 8 7 6

RS-485 –

Optional

RS-232

Connection

RS-485 cable to
RS-485-2 on UIT
(preconnected)

RS-232

RS-485-2

RS-485-1

RS-485-1

Connection

Ethernet

Optional
Ethernet

Connection

 Alarm Light and Optional Alarm Relays

Relay 1 on the ACS-UIT2 is factory-configured and wired for
“Any Alarms”. It will energize a push to test light on the front of
the panel if any alarm occurs.

The ACS-UIT2 has two other Form C alarm relays for external
alarms. Each relay can be connected to an annunciator light or
Building Management System (BMS).

Note: The above relays are shown in the energized position
without an alarm condition. The relay will change state with an
alarm condition or loss of power.

C

NC

Relay 2

NO

C

NC

NO

Relay 3

Alarm

Light

To

NC

C

1 2 3

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 ACS-UIT2 Connection Diagram

Front view

CAN

(not used)

RS-485

(not used)

RS-485

(not used)

USBPower

Side view

Open Collector Outputs

RS-485-2

Debug Port (not used)

RS-485-1

Bottom view

USB device port

(not used)

Ethernet

Termination

RS-485-1

RS-232

Side view

Termination

RS-485-2

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Back view

ACS-UIT2 Connection Diagram Overview of Wiring

To

Alarm

Light

NO
NC

Ø or N

100-240 Vac

Ø

±10%

G

Incoming

Power

Power Supply

To downstream devices

NO
NC

C

C

(ACS-PCM2-5 and RMM2)

RS-485 +
RS-485 –

Shield

5 4 3 2 1

T 9 8 7 6

Shield

To PC

RS-485 +
RS-485 –

5 4 3 2 1

T 9 8 7 6

1 2 3

Alarm Light

and Optional

RS-485

Field Port

RS-485

Remote Port

Alarm Relays

Servicing

TheACS-UIT2containsnouser-serviceableparts.ContactyournVentrepresentativeforserviceandanauthorization numberif

required.

Cleaning

The touch screen area of the ACS-UIT2 may be cleaned with a damp or dry cloth. Typical window cleaning agents may be applied to
aid in the removal of dirt, dust and grease. Do not use abrasive cleaners.

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 RS-485 conguration switches

Termination

The configuration switches are found on the right side of the
ACS-UIT2. Refer to the table below for settings.

3 2 1

ON

Pull-up

Pull-down

RS-485-1

Termination

Position

Switch On Off Comments

Pull-down (As-shipped default) RS-485 network “–”

Pull-up (As-shipped default) RS-485 network “+”

Termination (As-shipped default) RS-485 network is

signal is forced to a determinate state
when idle.

signal is forced to a determinate state
when idle.

terminated with 120-ohm resistor.

RS-485 network “–” signal is not forced to a
determinate state when idle.

RS-485 network “+” signal is not forced to a
determinate state when idle.

RS-485 network is not terminated. Terminate the device (ACS-UIT2 or other) that is at each end

One device (typically this ACS-UIT2) on the RS-485 network
should force the network “-“ signal to a determinate state.

One device (typically this ACS-UIT2) on the RS-485 network
should force the network “+“ signal to a determinate state.

of the RS-485 network, for a total of two terminated devices.
No other devices on the network should be terminated.

RS-485-2

Termination

 Reset switch

The Reset switch can be found on the side of the ACS-UIT2. A
pointed object is required to press the reset switch and restart the
ACS-30 software

North America

Tel [phone]
Fax [phone]
[e-mail]

Europe, Middle East, Africa

Tel [phone]
Fax [phone]
[e-mail]

Asia Pacific

Tel [phone]
Fax [phone]
[e-mail]

Reset

Latin America

Tel [phone]
Fax [phone]
[e-mail]

©2018 nVent. All nVent marks and logos are owned or licensed by nVent Services GmbH or its aliates. All other trademarks are the property of their respective owners.
nVent reserves the right to change specications without notice.

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