Emerson Control Link ACC Service-Handbuch

technical bulletin

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 1 of 18

Visit our website at http://www.emersonretailsolutions.com/ for the latest technical documentation and updates.

Installation Instructions: Control Link ACC Anti-Condensate

Controller System

Overview

The Control Link ACC Anti-Condensate Controller System is a stand-alone controller for anti-sweat

heaters in glass door cases. The Control Link ACC varies anti-sweat heat based on dewpoint and temp-

erature around the door frame, providing effective control of door sweat with the maximum amount of

energy savings.

Components

Control Link ACC (P/N 810-6101)

The Control Link ACC (Figure 1) handles all aspects

of anti-sweat heater control. The on-board processor

calculates the required heater ON time based on the

dewpoint and door temperature readings, and controls

an on-board Triac to activate and deactivate the heaters.

The controller is designed to mount in the mullion

between glass doors or in any other suitable electrical

enclosure, such as a raceway or on the top of the case.

The door frame temperature sensor and dewpoint sen-

sor are mounted remotely and connect to this controller

with cable harnesses.

Four LEDs can be viewed on the front of the plastic

enclosure. They indicate the general status, heater ON/

OFF state, MODBUS network transmit, and MODBUS

network receive.

Dewpoint Sensor (P/N 809-6112)

The Control Link ACC uses an external dewpoint sensor

(Figure 2) to measure the dewpoint of the outside air next

to the case doors. This sensor is typically mounted directly

above or to the side of the case doors.

The Dewpoint Sensor is supplied in a mountable enclosure

with a12-foot jacketed cable with a four-wire pigtail con-

nects the Control Link ACC to the dewpoint sensor.

Figure 1 - Control Link ACC

Figure 2 - Dewpoint Sensor (6112)

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 2 of 18

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Installation Instructions: Control Link ACC Anti-Condensate Controller System

technical bulletin

When Control Link ACC controllers are networked

together via MODBUS, a single dewpoint sensor con-

nected to one Control Link ACC may be shared by

multiple Control Link ACC controllers.

Door Temperature Sensor (P/N 201-6008)

In addition to the indoor air dewpoint, the Control

Link ACC also factors in the value of the temperature

of the case door frame using an externally mounted

temperature sensor. This small thermistor mounts to

the coldest surface of the door frame.

The door temperature sensor is supplied with an

8-foot two-wire cable with Molex connector, which

plugs into the Control Link ACC.

Mounting the Control Link ACC

The Control Link ACC enclosure is

designed to be mounted in a case mul-

lion, but may also be mounted in the

raceway or in a metal electrical enclosure

on the top of the case. Figure 4 shows

examples of where the Control Link

ACC may be mounted.

Use the two mounting tabs at the top and

bottom of the enclosure to screw the

enclosure to the case wall, raceway, or

enclosure.

The tab at the top end of the Control Link ACC (the end nearest the CPC logo) must be securely

mounted against a large heat-conductive surface. This tab has a metal backing which acts as a

heat sink, dissipating heat from the Triac that controls the heater. The metal tab must be

mounted against a conductive metal surface of at least 64 square inches so heat can be con-

ducted out of the controller. Failure to secure the top tab against the case mullion may cause con-

troller overheating and shutdown.

Use 9/64” drill holes for mounting, and secure the Control Link ACC to the metal surface using

#8-32 thread trilobular thread forming screws, Taptite II or equivalent (Ref. Ty-Bolts

#SCHWSZ08043-TR). Mounting screws are not included with the Control Link ACC.

Figure 3 - Dewpoint Sensor (6111)

(Discontinued)

Figure 4 - Control Link ACC Mounting

ACC

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 3 of 18

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Installation Instructions: Control Link ACC Anti-Condensate Controller System

technical bulletin

Wiring The Control Link ACC

Power And Heater Element Wiring

The four leads on the top end of the Control Link ACC

enclosure are where the connections to supply voltage

and the case door heater element(s) are made.

Connect the WHITE wire to the NEUTRAL side, and the

BLACK wire to the HOT side of 120-230VAC, 50/60Hz

line voltage.

The RED lead carries supply voltage when the door

heater Triac relay is ON (closed). Connect the RED and

WHITE leads to the case door heater elements. All

heater elements in the door frame and all doors of that

frame should be connected in parallel to the Control

Link ACC.

Connect the GREEN lead on the controller to ground.

Ratings and Current Protection

The Control Link ACC’s Triac is fused for 20A, 250V on the heater circuit, with a separate 1A

fuse on the control components so that communication can continue even if the Triac’s fuse

blows. Neither fuse is field-replaceable; if a fuse on the Control Link ACC blows, the controller

should be replaced. The maximum heater load is UL approved up to 13A.

WARNING! DO NOT CONNECT THE

POWER TO THE DEWPOINT SENSOR

LEADS AT THE BOTTOM OF THE ENCLO-

SURE. The small-gauge leads at the bottom

are the same colors, but they are for the dewpoint sen-

sor. Connecting power to these leads will damage the

board.

Figure 5 - Power/Heater Wiring

ACC

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 4 of 18

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Installation Instructions: Control Link ACC Anti-Condensate Controller System

technical bulletin

Mounting and Wiring the Sensors

The Dewpoint Sensor

Placement

In order for the Control Link ACC to

function properly, the dewpoint sensor

must be placed where it can measure

the dewpoint of the air outside the

case. Mount the sensor underneath the

top side of the case in the area just

above the top of the doors (see

Figure 6). If the sensor cannot be

placed there, mount the sensor on top

of the case.

Do NOT mount the dewpoint sensor

near the bottom of the case or any

place where cold air from the case can

affect the sensor reading. Avoid

mounting the sensor in an area with

excessive water spray or moisture, extremely dirty environments, near heat sources, or in the

direct path of HVAC returns.

Note About Using RTV Sealants

Placing the dewpoint sensor in either of these locations may require a hole to be drilled in the case

to run the wire from the sensor to the Control Link ACC. Use caution when sealing this hole with

RTV sealants — the sensor element is sensitive to high concentrations of RTV. Do not let any

RTV sealants touch the sensor element, and keep the sensor element as far as possible from where

the hole is sealed.

Dewpoint Sensor Mounting Dimensions

The Dewpoint Sensor is provided with a pair of

mounting holes with 2.75” spacing. Choose a

location as close to the case doors as possible,

preferably directly over the doors or (if necessary)

on top of the case. Secure the sensor to the mount-

ing location with two screws (not supplied —rec-

ommended size #6 x ¼” long with sheet metal

threads). Hex head is recommended, but a slotted

head can be used. Note that the enclosure allows

clearance for a nut driver on the screw head.

Figure 7 shows the mounting dimensions.

Figure 6 - Sensor Placement

Figure 7 - Dewpoint Sensor Dimensions

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 5 of 18

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Installation Instructions: Control Link ACC Anti-Condensate Controller System

technical bulletin

It may be necessary to cut a 0.25”x0.25” notch in the edge of the metal frame behind the sensor

for the wires to pass through.

Dewpoint Sensor Wiring

For wiring, the Dewpoint Sensor is pro-

vided with a 12-foot cable with a four-wire

pigtail at the end (P/N 335-3200). Connect

the cable to the dewpoint sensor leads at the

bottom of the Control Link ACC enclo-

sure, matching wire colors as shown in

Figure 8. Retail Solutions strongly recom-

mends Dolphin Super B Wire Connectors

(P/N 110-1000) for all crimp connections.

If the Control Link ACC will not have a

dewpoint sensor connected to it, it is recommended you insulate the ends of the Control Link

ACC’s dewpoint sensor leads by capping them with Dolphin Super B Wire Connectors.

Dewpoint Sensor Storage

Prior to installation, dewpoint sensors should be stored separately from the cables. Do not store

cables and sensors together for a long period of time in a closed box or bag. The sensor should be

separated from the cables when a shipment is received and stored apart, preferably exposed to

room air. The sensors can become contaminated by outgassing from the cable insulation if kept in

a closed up box or bag with the cable. Contamination can be reversed with exposure to room air

over a period of weeks or in a temperature/humidity chamber over a period of three days.

The Door Temperature Sensor

Placement

The Door Temperature Sensor should be placed in an area where it can measure the temperature

of the door frame in the location on the door frame that stays the coldest. The coldest spot on a

door frame is usually the bottom horizontal section of the stationary frame, under the center door

(for cases with even-numbered doors), or near the center mullion (for cases with odd-numbered

doors). Cooler doors may also be coldest at the top center of the frame. Figure 6 on page 4 shows

an example of placement in a case with even-numbered doors — the sensor is placed under the

door just to the left of the center mullion where the Control Link ACC is installed. Do not mount

the sensor inside the case mullion or anywhere outside the case.

Mount the case door temperature sensor along the door frame inside the frame. Secure the sensor

in place by screwing it to the door frame using the mounting hole.

NOTE: To replace the dewpoint sensor for recalibration pur-

poses, replace the entire assembly (keep the existing cable).

Figure 8 - Dewpoint Sensor Wiring

ACC

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 6 of 18

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Installation Instructions: Control Link ACC Anti-Condensate Controller System

technical bulletin

The sensor is supplied with an 8-foot cable, with a Molex connector. Plug the connector into the

matching socket at the bottom of the Control Link ACC enclosure.

Network Wiring and Configuration

If each Control Link ACC will be configured with its own dewpoint sensor, it is not necessary to

network the Control Link ACC together. However, when networked, multiple Control Link ACC

controllers may use a single dewpoint sensor. Furthermore, because the Control Link ACC is a

MODBUS-compliant device, a site controller can be programmed to communicate with the Con-

trol Link ACC controllers via MODBUS, supporting remote configuration and data acquisition.

The E2 controller supports networking of up to 63 Control Link ACC controllers.

Network Connection to E2

Connecting a Control Link ACC to an

E2 unit requires the E2 to be version

2.71 or above. Contact Retail Solutions

for upgrade information if the controller

is a version before 2.71.

An E2 has up to three COM ports that

can be assigned for MODBUS commu-

nication (COM2, an RS485 port on the

E2 power interface board, and COM4

and COM6, which are optional ports

requiring expansion cards). COM ports

can only be used for one function; in

other words, if COM2 is set up as the

I/O network, you cannot connect MOD-

BUS devices to COM2. Ensure your E2

is equipped with an RS485 COM Card

(P/N 637-4890) and configured in E2

General Services (I, Serial

tab) to enable COM4 or an E2 Expansion COM Card (P/N 637-4871) to enable COM6.

Connect the MODBUS network cable to the three-terminal connector on the COM port you wish

to assign as MODBUS. Like other Control Link connections, wire RS485+ to RS485+, RS485- to

RS485-, and the shield cable to the middle terminal. If the E2 will be the first device in the daisy-

chain, set the port’s termination jumpers to the TERMINATED & BIASED position (all three

jumpers UP); otherwise, set all jumpers DOWN if not the first device.

COM1

COM4

COM6

COM2

Serial Device

RS485 COM Port

(2 Connectors)

RS485 COM Card

(2 Connectors) Serial Device

RS232 Port

POWER INTERFACE BOARD

(PIB)

E2 Modem/Expansion

COM Card Mounted

Above PIB

Plug-In

Modem

Card

COM3

E2 Enclosure (Right Side)

RS485

RS232

Figure 9 - Location of E2 COM Ports

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 7 of 18

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Installation Instructions: Control Link ACC Anti-Condensate Controller System

technical bulletin

E2 Setup of Control Link ACC Devices

Set Up Network Ports

Before setting up a Control Link ACC, the port on the E2 that has the MODBUS cable connected

must be set up as a MODBUS port.

1. Log in to the E2 with Level 4 access.

2. Press I followed by  - General Controller Info.

3. Press 4+ to open the Serial tab of the General Controller Info setup screens:

4. This screen will have a “Connection” field for all COM ports on the E2. Highlight the COM

port connection field that will be used for Control Link, and press D - LOOK UP. From

the list of network types, select MODBUS.

5. Four fields will become visible underneath the COM port connection field, which pertain to

the way the device communicates:

•Baud - Default setting is 19.2k. The baud rate setting should be set to match the baud rate dip switch settings

of all Control Link devices. (All devices connected to the same COM port should be set to the same baud

rate.)

•Data Size - Leave this field at the default value (8).

•Parity - Leave this field at the default value (None).

•Stop Bits - Leave this field at the default value (1).

6. Press J to save changes and exit.

Add and Connect Control ACCs

To enable communications between E2 and the Control Link units, the devices must be added and

addressed in E2.

1. Log in to the E2 with Level 4 access.

2. Press I - Connected I/O Boards and Controllers.

Figure 10 - Serial Communications Manager Screen

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 8 of 18

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Installation Instructions: Control Link ACC Anti-Condensate Controller System

technical bulletin

3. In the Connected I/O screen, in a box labeled ECT Devices. Enter the number of ACC devices in the

CtrlLink ACC number field.

4. Press J to return to the Network Setup menu, then select  - Controller Setup.

5. Locate the CtrlLink ACC units you added to the network list (press 8 and 7 to scroll through the list). The

default name for a Control Link ACC begins with a two-letter designator of the model type (AC for anti-con-

densate). If desired, enter a new name for each device in the Name field.

6. By default, each CtrlLink ACC in the network list has a board number of 0. To set the address and begin

communication, press D and select  - Select Address. In the list of MODBUS devices, choose the

address number corresponding to the Control Links ACC’s dip switch/jumper setting, and press > to

select it. If a network ID has already been selected, its name will be shown next to the network ID in this list.

If the network ID you are trying to assign has already been used, you must set the network ID dip switch/

jumper on this device to a different number that is not being used.

Figure 11 - Connected I/O Screen

Figure 12 - Controller Setup Screen

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 9 of 18

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Installation Instructions: Control Link ACC Anti-Condensate Controller System

technical bulletin

7. Repeat Steps 5 and 6 until each Control Link ACC device has a name and address.

8. When finished, press J to return to the Network Setup menu, then press  - Online Status (Figure 14).

Locate the Control Link ACCs you set up, and look at each device’s status in the Status field. You will see

one of the following messages:

•Online - The Control Link ACC is communicating normally.

•Offline - The Control Link ACC is not communicating, has not been commissioned, is not functional, or is not powered up. Ver-

ify the Control Link ACC is powered up, wired correctly, and has the proper network address, baud rate, and parity (see

“Troubleshooting Control Link ACCs and the ECT MODBUS Network” on page 18).

•Unknown - The Control Link ACC is not communicating or has not been commissioned. Verify the Control Link ACC is pow-

ered up, wired correctly, and has the proper network address, baud rate, and parity (see “Troubleshooting Control Link

ACCs and the ECT MODBUS Network” on page 18).

•No Port - No port is set up in the E2 Serial Configuration Manager to be a MODBUS port. Follow the instructions in “Set Up

Network Ports,” page 7.

•Wrong FW Rev - This message is likely caused by the Control Link ACC having a firmware version older than the minimum

revision required by E2 for communication. Replace the Control Link ACC with a new controller that has the latest version

of firmware on it.

Figure 13 - List of MODBUS Devices

Document Part # 026-4703 Rev 8 10-JUN-2009 Page 10 of 18

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Installation Instructions: Control Link ACC Anti-Condensate Controller System

technical bulletin

Wiring Types

Retail Solutions specifies Belden #8761 shielded twisted pair cables for use as MODBUS wiring (or Belden

#82761 and Belden #88761 for plenum installations).

If the recommended cable is not available in your area, be sure the wiring meets or exceeds the following specs:

Shielded? Yes

Conductor Type Twisted Pair

Gauge 18 - 24 AWG

Capacitance between

signal wires 31 pF/ft or less

Capacitance between

signal and shield 59 pF/ft or less

Maximum Length 4000 ft/18 to 22 AWG

2500 ft/24 AWG

Nominal Impedance 120Ω±50Ω

Figure 14 - Online Status Screen

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