Honeywell PVB6438NS, PVB6435AS, PVB4022AS, PVB0000AS, PVB4024S User Manual

...

Spyder® BACnet Programmable Controllers

PRODUCT DATA

PRODUCT DESCRIPTION

The PUB and PVB controllers are part of the Spyder family. These controllers are BACnet MS/TP network devices designed to control HVAC equipment. These controllers provide many options and advanced system features that allow state-of-the-art commercial building control. Each controller is programmable and configurable through software.

Table 1. Controller configurations.

Controller

Model

PUB1012S Unitary 1 0 1 2 NO NO

PUB4024S Unitary 4 0 2 4 NO NO

PUB6438S Unitary 6 4 3 8 NO NO

PVB0000AS VAV 0 0 0 0 YES YES

PVB4022AS VAV 4 0 2 2 YES YES

PVB4024NS VAV 4 0 2 4 YES NO

PVB6436AS VAV 6 4 3 6 YES YES

PVB6438NS VAV 6 4 3 8 YES NO

Each controller communicates via an EIA-485 BACnet MS/TP communications network, capable of baud rates between 9.6 and

115.2 kbits/s. Controllers are field-mountable to either a panel or a DIN rail.

Programmable

Type

Universal

Inputs

(UI)

Digital Inputs

(DI)

The Spyder BACnet controllers require the Spyder BACnet Programmable Feature to be licensed in the WEBpro workbench tool and the WEBS AX JACE Controller for programming and downloading. The Spyder BACnet Models are also available as Individually Licensed Controllers (ILC). The ILC versions are identical in design and capability in every detail except for the licensing. The Individual Licensing of the Spyder ILCs (the License is built in) allows them to be programmed and downloaded with any brand of the Niagara Workbench or JACE controller. The Spyder ILCs are identified with a suffix on the Part Number of -ILC. Example: PUB6438S-ILC follows all the same Installation Instructions information as the PUB6438S.

These controllers are for use in VAV (Variable Air Volume), Unitary and advanced HVAC control applications. Each controller has flexible, universal inputs for external sensors, digital inputs, and a combination of analog and digital Triac outputs. All the models are described in Table 1. The photo to the left is the model PVB6436AS, which includes the actuator.

Analog

Outputs

(AO)

Digital

Outputs

(DO)

Velocity

Pressure

Sensor

(Microbridge)

Series 60

Floating

Actuator

63-2689-05

SPYDER® BACNET® PROGRAMMABLE CONTROLLERS

SPECIFICATIONS

General Specifications

Rated Voltage: 20–30 Vac; 50/60 Hz Power Consumption:

100 VA for controller and all connected loads (including the

actuator on models PVL0000AS, PVL4022AS and PVL6436AS).

Controller Only Load: 5 VA maximum; models PUB1012S,

PUB4024S, PUB6438S, PVB4024NS and PVB6438NS.

Controller and Actuator Load: 9 VA maximum; models

PVL0000AS, PVL4022AS and PVL6436AS.

External Sensors Power Output: 20 Vdc ±10% @ 75 mA

maximum.

VAV Operating & Storage Temperature Ambient Rating

(models PVB0000AS, PVB4022AS, PVB4024NS, PVB6436AS and PVB6438NS):

Minimum 32 ºF (0 ºC); Maximum 122 ºF (50 ºC)

Unitary Operating & Storage Temperature Ambient Rating

(models PUB1012S, PUB4024S and PUB6438S):

Minimum -40 ºF (-40 ºC); Maximum 150 ºF (65.5 ºC)

Relative Humidity: 5% to 95% non-condensing LED: Provides status for normal operation, controller down-

load process, alarms, manual mode, and error conditions

Velocity Pressure Sensor (models PVB0000AS, PVB4022AS, PVB4024NS, PVB6436AS and PVB6438NS)

Operating Range: 0 to 1.5 in. H2O (0 to 374 Pa)

Digital Input (DI) Circuits

Volt age Rati ng: 0 to 30 Vdc open circuit Input Type: Dry contact to detect open and closed circuit Operating Range: Open circuit = False; Closed circuit = True Resistance: Open circuit > 3,000 Ohms; Closed circuit < 500

Ohms

Digital Triac Output (DO) Circuits

Volt age Rati ng: 20 to 30 Vac @ 50/60Hz Current Rating: 25 mA to 500 mA continuous, and

800 mA (AC rms) for 60 milliseconds

Analog Output (AO) Circuits

Analog outputs can be individually configured for current or voltage.

ANALOG CURRENT OUTPUTS: Current Output Range: 4.0 to 20.0 mA Output Load Resistance: 550 Ohms maximum

ANALOG VOLTAGE OUTPUTS: Voltage Output Range: 0.0 to 10.0 Vdc Maximum Output Current: 10.0 mA

Analog outputs may be configured as digital outputs and operate as follows:

– False (0%) produces 0 Vdc, (0 mA) – True (100%) produces the maximum 11 Vdc, (22 mA)

Series 60 Floating Actuator (models PVB0000AS, PVB4022AS and PVB6436AS)

Rotation Stroke: 95° ± 3° for CW or CCW opening dampers Torque Ratin g: 44 lb-in. (5 Nm) Run Time for 90° rotation: 90 seconds at 60 Hz Operating Temperature: -4 ºF to 140 ºF (-20 to 60 ºC)

Real Time Clock

Operating Range: 24 hour, 365 day, multi-year calendar

including day of week and configuration for automatic daylight savings time adjustment to occur at 2:00 a.m. local time on configured start and stop dates

Power Failure Backup:

38°C), 22 hours at 100°F to 122°F (38°C to 50°C)

Accuracy: ±1 minute per month at 77 °F (25 °C)

24 hours at 32°F to 100°F (0°C to

Universal Input (UI) Circuits

See Table 2 for the UI circuit specifications.

Table 2. Universal input circuit specifications.

Input

Type

Room/Zone Discharge Air Outdoor Air Temperature

Outdoor Air Temperature

Sensor

Typ e

20K Ohm NTC

C7031G

C7041F

PT1000 (IEC751 3850)

-40 to 199 (-40 to 93

-40 to 120 °F (-40 to 49

-40 to 250 °F (-40 to 121

-40 to 199 (-40 to 93

Operating

Range

ORDERING INFORMATION

When purchasing replacement and modernization products from your TRADELINE® wholesaler or distributor, refer to the TRADELINE® Catalog or price sheets for complete ordering number. If you have additional questions, need further information, or would like to comment on our products or services, please write or phone:

1. Your local Honeywell Environmental and Combustion Controls Sales Office (check white pages of your phone directory).

2. Honeywell Customer Care

1985 Douglas Drive North Minneapolis, Minnesota 55422-4386

3. http://customer.honeywell.com or http://customer.honeywell.ca International Sales and Service Offices in all principal cities of the world. Manufacturing in Belgium, Canada, China, Czech Republic, Germany, Hungary, Italy, Mexico, Netherlands, United Kingdom, and United States.

63-2689—05 2

SPYDER® BACNET® PROGRAMMABLE CONTROLLERS

WARNING

Input

Type

TR23 Setpoint Potentiometer

Resistive Input Generic 100 Ohms to 100K Ohms

Voltag e Input

Discrete Input Dry Contact

C7031G and C7041F are recommended for use with these controllers, due to improved resolution and accuracy when compared to the PT1000.

Sensor

Typ e

500 Ohm to 10,500 Ohm

Transducer, Controller

closure

Operating

Range

-4° DDC to +4° DDC (-8° DDF to +7° DDF) or 50 F to 90 F (10 C to 32 C)

0–10 Vdc

Open Circuit > 3000 Ohms Closed Circuit < 3000 Ohms

BEFORE INSTALLATION

The controller is available in three models (see Table 1).

Review the power, input, and output specifications on page 2 before installing the controller. — Hardware driven by Triac outputs must have a minimum

current draw, when energized, of 25 mA and a maximum current draw of 500 mA.

— Hardware driven by the analog current outputs must have a

maximum resistance of 550 Ohms, resulting in a maximum voltage of 11 volts when driven at 20 mA. If resistance exceeds 550 Ohms, voltages up to 18 Vdc are possible at the analog output terminal.

Electrical Shock Hazard. Can cause severe injury, death or property damage.

Disconnect power supply before beginning wiring or making wiring connections to prevent electrical shock or equipment damage.

INSTALLATION

The controller must be mounted in a position that allows clearance for wiring, servicing, removal, connection of the BACnet MS/TP Molex connector and access to the MS/TP MAC address DIP switches (see Fig. 15 on page 12).

For the PVB6436AS model, the actuator is mounted first and then the controller is mounted. For the other models, go to “Mount Controller” on page 5 to begin the installation.

Mount Actuator onto Damper Shaft (PVB0000AS, PVB4022AS and PVB6436AS)

PVB0000AS, PVB4022AS and PVB6436AS controllers include the direct-coupled actuator with Declutch mechanism, which is shipped hard-wired to the controller.

The actuator mounts directly onto the VAV box damper shaft and has up to 44 lb-in. (5 Nm) torque, 90-degree stroke, and 90 second timing at 60 Hz. The actuator is suitable for mounting onto a 3/8 to 1/2 in. (10 to 13 mm) square or round VAV box damper shaft. The minimum VAV box damper shaft length is 19/16 in. (40 mm).

The two mechanical end-limit set screws control the amount of rotation from 12° to 95°. These set screws must be securely fastened in place. To ensure tight closing of the damper, the shaft adapter has a total rotation stroke of 95° (see Fig. 1).

NOTES:

1. The actuator is shipped with the mechanical endlimit set screws set to 95 degrees of rotation. Adjust the two set screws closer together to reduce the rotation travel. Each “hash mark” indicator on the bracket represents approximately 6.5° of rotation per side.

2. The Declutch button, when pressed, allows you to rotate the universal shaft adapter (see Fig. 1).

IMPORTANT

Determine the damper rotation and opening angle prior to installation. See Fig. 2 below and Fig. 3 on page 4 for examples.

UNIVERSAL SHAFT

CLAMPING BOLTS (2)

UNIVERSAL

SHAFT ADAPTER

MECHANICAL

END LIMIT SET

SCREWS (2)

The controller may be mounted in any orientation.

IMPORTANT

Avoid mounting in areas where acid fumes or other deteriorating vapors can attack the metal parts of the controller, or in areas where escaping gas or other explosive vapors are present. Fig. 6–Fig. 7 on page 5 for mounting dimensions.

DECLUTCH

BUTTON

M23568

Fig. 1. Series 60 Floating Actuator.

3 63-2689—05

SPYDER® BACNET® PROGRAMMABLE CONTROLLERS

M23569

DAMPER SHAFT ROTATES CLOCKWISE TO OPEN

DAMPER

AIR FLOW

CW TO OPEN, CCW TO CLOSE

CCW TO OPEN, CW TO CLOSE

M2067B

TYPE A DAMPER

TYPE B DAMPER

Fig. 2. Damper with 90 degree CW rotation to open.

IMPORTANT

Mount actuator flush with damper housing or add a spacer between the actuator mounting surface and damper box housing.

Before Mounting Actuator onto Damper Shaft (PVB0000AS, PVB4022AS and PVB6436AS)

Tools required: — Phillips #2 screwdriver - end-limit set screw adjustment — 8 mm wrench - centering clamp

Before mounting the actuator onto the VAV box damper shaft, determine the following:

1. Determine the damper shaft diameter. It must be between 3/8 in. to 1/2 in. (10 to 13 mm).

2. Determine the length of the damper shaft. If the length of the VAV box damper shaft is less than 1-9/16 in. (40 mm), the actuator cannot be used.

Determine the direction the damper shaft rotates to open the damper (CW or CCW) (see Fig. 3). Typically, there is an etched line on the end of the damper shaft that indicates the position of the damper. In Fig. 2, the indicator shows the damper open in a CW direction.

4. Determine the damper full opening angle (45, 60, or 90 degrees). In Fig. 2, the damper is open to its full open position of 90 degrees.

Fig. 3. Determining the rotation direction (CW or CCW)

for damper opening.

63-2689—05 4

Mounting Actuator Onto Damper Shaft (PVB0000AS, PVB4022AS and PVB6436AS)

The unit is shipped with the actuator set to rotate open in the clockwise (CW) direction to a full 95 degrees. The extra 5 degrees ensures a full opening range for a 90 degree damper. The installation procedure varies depending on the damper opening direction and angle:

1. If the damper rotates clockwise (CW) to open, and the angle of the damper open-to-closed is 90 degrees: a. Manually open the damper fully (rotate clockwise). b. Using the Declutch button, rotate the universal shaft

adapter fully clockwise. c. Mount the actuator to the VAV damper box and shaft. d. Tighten the two bolts on the centering clamp

(8 mm wrench; 70.8–88.5 lb-in. [8–10 Nm] torque).

When the actuator closes, the damper rotates CCW

90 degrees to fully close.

2. If the damper rotates clockwise (CW) to open, and the angle of the damper open-to-closed is 45 or 60 degrees: a. Manually open the damper fully (rotate clockwise). b. The actuator is shipped with the mechanical

end-limits set at 95 degrees. Adjust the two mechanical end-limit set screws to provide the desired amount of rotation. Adjust the two set screws closer together to reduce the rotation travel.

c. Tighten the two mechanical end-limit screws (Phillips

#2 screwdriver; (26.5–31 lb-in. [3.0–3.5 Nm] torque).

d. Using the Declutch button, rotate the universal shaft

adapter fully clockwise. e. Mount the actuator to the VAV damper box and shaft. f. Tighten the two bolts on the centering clamp

(8 mm wrench; 70.8–88.5 lb-in. [8–10 Nm] torque). g. When the actuator closes, the damper rotates CCW

either 45 or 60 degrees to fully close. If the damper rotates counterclockwise (CCW) to open, and the angle of the damper open-to-closed is 90 degrees: a. Manually open the damper fully (rotate counterclock-

wise). b. Using the Declutch button, rotate the universal shaft

adapter fully counterclockwise. c. Mount the actuator to the damper box and shaft. d. Tighten the two bolts on the centering clamp (8 mm

wrench; 70.8–88.5 lb-in. [8–10 Nm] torque). When

the actuator closes, the damper rotates CW

90 degrees to fully close. If the damper rotates counterclockwise to open, and the angle of the damper open-to-closed is 45 or 60 degrees: a. Manually open the damper fully (rotate counterclock-

wise). b. The actuator is shipped with the mechanical

end-limits set at 95 degrees. Adjust the two

mechanical end-limit set screws to provide the

desired amount of rotation. Adjust the two set screws

closer together to reduce the rotation travel. c. Tighten the two mechanical end-limit screws

(Phillips #2 screwdriver; (26.5–31 lb-in. [3.0–3.5 Nm]

torque). d. Using the Declutch button, rotate the universal shaft

adapter fully counter-clockwise. e. Mount the actuator to the VAV damper box and shaft. f. Tighten the two bolts on the centering clamp

(8 mm wrench; 70.8–88.5 lb-in. [8–10 Nm] torque). g. When the actuator closes, the damper rotates CW

either 45 or 60 degrees to fully close.

SPYDER® BACNET® PROGRAMMABLE CONTROLLERS

NOTE: CONTROLLER CAN BE MOUNTED IN ANY ORIENTATION.

M31532

8-9/32

(211)

1-15/16

(49)

6-9/32

(159)

3/16 (4.5) PANEL

MOUNTING HOLE (4X)

27/32

(21)

4-1/8 (105)

6-1/4 (159)

5-7/8 (149)

DEPTH IS

2-1/ 4 (57)

1 2 3 4 5 6 7 8 9 10 11 12

14 15 16 17 18 19 20 21 22 23

IMPORTANT

Special precautions must be taken for dampers that open in a CCW direction. The actuator is shipped with its rotation direction set to CW to Open, which applies to the damper direction in steps 1 and 2 above. If the damper shaft rotates in the CCW direction to open, the controller software must be programmed to change the rotation to “Reverse to Open,” which applies to the damper direction in steps 3 and 4 above.

IMPORTANT

It is advisable to leave the dampers in an open position after installation to avoid the possibility of over-pressurizing the duct work on fan startup. Use the Declutch button (see Fig. 1 on page 3) to open the box damper on controllers that are powered down, to prevent over-pressurization in the duct work on fan startup. To Declutch, press and hold the button to disengage the motor. Turn the damper shaft until the damper is open and release the button. When power is restored to the controller, the controller synchronizes the damper actuator, so that the damper is in the correct position upon startup.

Mount Controller

NOTE: The controller may be wired before mounting to a

panel or DIN rail.

Terminal blocks are used to make all wiring connections to the controller. Attach all wiring to the appropriate terminal blocks (see “Wiring” on page 8).

6-1/4 (159)

5-7/8 (149)

4-13/16 (122)

13 14 15 16 17 18

4-1/8 (105)

19 20 21 22 23 24

DEPTH IS 2-1/4 (57)

6-1/4 (159)

5-7/8 (149)

4-13/16 (122)

14 15 16 17

4-1/8 (105)

19 20 21 22 23 24

Fig. 5. Panel mounting - controller and actuator dimensions in inches (mm) for PVB0000AS and

PVB4022AS only (PVB4022AS shown).

10-5/16 (262)

5-3/4 (146)

5-3/64

(128)

123456

NOTE: CONTROLLER CAN BE MOUNTED IN ANY ORIENTATION.

8-5/16 (211)

6-29/64 (164)

2222222223

123456780

PANEL MOUNTING HOLE

11 111111 109 234567

(4X) 3/16 IN. (4.5)

333

123456780

1-55/64

(47)

DEPTH IS

2-1/ 4 (57)

7/16 (11)

6-17/64

(159)

M29329

1 2 3 4 5 6 7 8 9 10 11 12

3/16 (4.5) PANEL MOUNTING HOLE (4X)

NOTE: CONTROLLER CAN BE MOUNTED IN ANY ORIENTATION.

Fig. 4. Panel mounting - controller dimensions in inches

(mm) for PUB1012S, PUB4024S and PVB4024NS only

(PUB4024S and PVB4024NS shown).

5-3/4

(146)

NOTE: CONTROLLER CAN BE MOUNTED IN ANY ORIENTATION.

Fig. 7. Panel mounting - controller dimensions in inches (mm) for models PUB6438S and PVB6438NS.

5-29/64

(139)

5-3/64

(128)

1 2 3 4 5 6 7 8 9 10 11 12

PVB6438NS

2 2 1 2 3 4 5 6

7 8

1 2 3 4 5 6

6-29/64 (164)

6-27/32 (174)

M31531

PANEL MOUNTING HOLE

(4X) 29/64 IN. (12)

2 2 2 2

3 3 3

3 3

2 2 3 3

3 3

3 4

1 2 3 4 5 6

7 8 0 9

1 1 1 1 1 1 1 1 1 2 1 1 0 9 2 3 4 5 6 7 8 0 9

7 8 0 9

Fig. 6. Panel mounting - controller and actuator

dimensions in inches (mm) for PVB6436AS.

PUB6438S

2 2 2 2

3 3 3

2 2 3 3

7 8 0 9

1 1 1 1 1 1 1 1 1 2 1 1 0 9 2 3 4 5 6 7 8 0 9

3 3

1 2 3 4 5 6

3 3

3 4

7 8 0 9

M29330

2 2

5-3/64

(128)

5-29/64

(139)

1 2 3 4 5 6

DEPTH IS 2-1/ 4 (57)

5 63-2689—05

1 2 3 4 5 6

7 8

6-29/64 (164) 6-27/32 (174)

SPYDER® BACNET® PROGRAMMABLE CONTROLLERS

DIN RAIL

TOP TABS

BOTTOM FLEX CONNECTORS

M16815

Panel Mounting

The controller enclosure is constructed of a plastic base plate and a plastic factory-snap-on cover.

NOTE: The controller is designed so that the cover does

not need to be removed from the base plate for either mounting or wiring.

The controller mounts using four screws inserted through the corners of the base plate. Fasten securely with four No. 6 or No. 8 machine or sheet metal screws.

The controller can be mounted in any orientation. Ventilation openings are designed into the cover to allow proper heat dissipation, regardless of the mounting orientation.

DIN Rail Mounting (PUB1012S, PUB4024S, PUB6438S, PVB4024NS and PVB6438NS)

To mount the PUB1012S, PUB4024S, PUB6438S, PVB4024NS and PVB6438NS controllers on a DIN rail [standard EN50022; 1-3/8 in. x 9/32 in. (7.5 mm x 35 mm)], refer to Fig. 8 and perform the following steps:

1. Holding the controller with its top tilted in towards the DIN rail, hook the two top tabs on the back of the controller onto the top of the DIN rail.

2. Push down and in to snap the two bottom flex connectors of the controller onto the DIN rail.

IMPORTANT

To remove the controller from the DIN rail, perform the following:

1. Push straight up from the bottom to release the top

tabs.

2. Rotate the top of the controller out towards you and

pull the controller down and away from the DIN rail to release the bottom flex connectors.

NOTES:

— Use 1/4 inch (6 mm) outside diameter, with a 0.040

in. (1 mm) wall thickness, plenum-rated 1219 FR (94V-2) tubing.

— Always use a fresh cut on the end of the tubing

that connects to the air flow pickups and the restrictor ports on the controller.

Connect the high pressure or upstream tube to the plastic restrictor port labeled ( tube to the restrictor port labeled (

+), and the low pressure or downstream

-). See labeling in Fig. 9.

When twin tubing is used from the pickup, split the pickup tubing a short length to accommodate the connections.

NOTES:

— If controllers are mounted in unusually dusty or dirty

environments, an inline, 5-micron disposable air filter (

use 5-micron filters compatible with pneumatic controls) pressure line (marked as

is recommended for the high

) connected to the air

flow pickup.

— The tubing from the air flow pickup to the controller

should not exceed three feet (0.914 m). Any length greater than this will degrade the flow sensing accuracy.

— Use caution when removing tubing from a connec-

tor. Always pull straight away from the connector or use diagonal cutters to cut the edge of the tubing attached to the connector. Never remove by pulling at an angle.

AIR FLOW PICKUP

RESTRICTOR

PORT

ΔP

CONNECTOR TUBING

RESTRICTOR PORT

2 2 2 2

2 2

2 2 3 3

1 2 3 4 5 6

7 8 0 9

3 3 3

3 3

1 2 3 4 5 6

3 3

3 4

7 8 0 9

Fig. 8. Controller DIN rail mounting (models PUB1012S,

PUB4024S, PUB6438S, PVB4024NS and PVB6438NS).

Piping (PVB0000AS, PVB4022AS, PVB4024NS, PVB6436AS and PVB6438NS)

Air flow Pickup

For PVB0000AS, PVB4022AS, PVB4024NS, PVB6436AS and PVB6438NS, connect the air flow pickup to the two restrictor ports on the controller (see Fig. 9).

63-2689—05 6

1 1 1 1 1 1 1 1 1 2 1 1 0 9 2 3 4 5 6 7 8 0 9

M23556A

1 2 3 4 5 6

7 8

Fig. 9. Air flow pickup connections (PVB0000AS,

PVB4022AS, PVB4024NS, PVB6436AS and PVB6438NS).

Power

Before wiring the controller, determine the input and output device requirements for each controller used in the system. Select input and output devices compatible with the controller and the application. Consider the operating range, wiring requirements, and the environment conditions when selecting input/output devices. When selecting actuators for modulating applications consider using floating control. In direct digital control applications, floating actuators will generally provide control action equal to or better than an analog input actuator for lower cost.

Determine the location of controllers, sensors, actuators and other input/output devices and create wiring diagrams. Refer to Fig. 17–Fig. 23 beginning on page 14 for illustrations of typical controller wiring for various configurations.

SPYDER® BACNET® PROGRAMMABLE CONTROLLERS

The application engineer must review the control job requirements. This includes the sequences of operation for the controller, and for the system as a whole. Usually, there are variables that must be passed between the controller and other Spyder BACnet controller(s) that are required for optimum system wide operation. Typical examples are the TOD, Occ/ Unocc signal, the outdoor air temperature, the demand limit control signal, and the smoke control mode signal.

It is important to understand these interrelationships early in the job engineering process, to ensure proper implementation when configuring the controllers. Refer to the controller Application Guides.

Power Budget

A power budget must be calculated for each device to determine the required transformer size for proper operation. A power budget is simply the summing of the maximum power draw ratings (in VA) of all the devices to be controlled. This includes the controller itself and any devices powered from the controller, such as equipment actuators (ML6161 or other motors) and various contactors and transducers.

IMPORTANT

• When multiple controllers operate from a single transformer, connect the same side of the transformer secondary to the same power input terminal in each device. The earth ground terminal (terminal 3) must be connected to a verified earth ground for each controller in the group (see Fig. 12 on page 9).

• Half-wave devices and full-wave devices must not use the same AC transformer. If a Spyder controller will share its power supply with another device, make sure the other device utilizes a half-wave rectifier and that the polarity of the wiring is maintained.

POWER BUDGET CALCULATION EXAMPLE

Table 3 is an example of a power budget calculation for a typical PVB6436AS controller. While the example is shown for only this model, the process is applicable for all controller models.

Table 3. Power budget calculation example.

Device

PVB6436AS controllers (include Series 60 Floating Damper Actuator)

R8242A Contactor fan rating

D/X Stages 0.0 For example, assume

M6410A Steam Heating Coil Valve

TOTAL 30.7

Information

Obtained From

9.0 See “Specifications” on page 2.

21.0

TRADELINE inrush rating

cooling stage outputs are wired into a compressor control circuit and have no impact on the budget.

0.7

TRADELINE

0.32A 24 Vac

Catalog

Catalog,

is less than 33 VA, this same transformer could be used to power three of these controllers and meet NEC Class 2 restrictions (no greater than 100 VA).

See Fig. 11–Fig. 12 beginning on page 9 for illustrations of controller power wiring. See Table 4 for VA ratings of various devices.

Table 4. VA ratings for transformer sizing.

Device Description VA

PVB6436AS

Controller and Actuator 9.0 controllers and Series 60 Floating Damper Actuator

PUB6438S or

Controller 5.0 PVB6438NS

ML684 Versadrive Valve Actuator 12.0

ML6161 Damper Actuator, 35 lb-in. 2.2

ML6185 Damper Actuator SR 50 lb-in 12.0

ML6464 Damper Actuator, 66 lb-in. 3.0

ML6474 Damper Actuator, 132 lb-in. 3.0

R6410A Valve Actuator 0.7

R8242A Contactor 21.0

For contactors and similar devices, the in-rush power ratings should be used as the worst case values when performing power budget calculations. Also, the application engineer must consider the possible combinations of simultaneously energized outputs and calculate the VA ratings accordingly. The worst case, which uses the largest possible VA load, should be determined when sizing the transformer.

Each controller requires 24 Vac power from an energy-limited Class II power source. To conform to Class II restrictions (U.S. only), transformers must not be larger than 100 VA. A single transformer can power more than one controller.

GUIDELINES FOR POWER WIRING ARE AS FOLLOWS:

— For multiple controllers operating from a single

transformer, the same side of the transformer secondary must be connected to the same power input terminal in each device. The earth ground terminal must be connected to a verified earth ground for each controller in the group (see Fig. 12 on page 9). Controller configurations are not necessarily limited to three devices, but the total power draw, including accessories, cannot exceed 100 VA when powered by the same transformer (U.S. only).

— See Fig. 11 on page 9 for controller power wiring used

in UL 1995 equipment (U.S. only).

— Many controllers require all loads to be powered by the

same transformer that powers the controller.

— Keep the earth ground connection wire run as short as

possible (refer to Fig. 11–Fig. 12 beginning on page 9).

— Do not connect earth ground to the controller’s digital or

analog ground terminals (refer to Fig. 11 and Fig. 12).

— Unswitched 24 Vac power wiring can be run in the

same conduit as the L

ONWORKS® Bus cable.

The system example above requires 30.7 VA of peak power. Therefore, a 100 VA AT92A transformer could be used to power one controller of this type. Because the total peak power

Line-Loss

Controllers must receive a minimum supply voltage of 20 Vac. If long power or output wire runs are required, a voltage drop due to Ohms Law (I x R) line-loss must be considered. This line-loss can result in a significant increase in total power

7 63-2689—05

SPYDER® BACNET® PROGRAMMABLE CONTROLLERS

WARNING

0 50 100 150

% OF LOAD

SECONDARY VOLTAGE

200

M993

required and thereby affect transformer sizing. The following example is an I x R line-loss calculation for a 200 ft. (61m) run from the transformer to a controller drawing 37 VA and using two 18 AWG (1.0 sq mm) wires.

The formula is:

Loss = [length of round-trip wire run (ft.)] x [resistance in wire (ohms per ft.)] x [current in wire (amperes)]

From specification data:

18 AWG twisted pair wire has a resistance of 6.52 ohms per 1000 feet.

Loss = [(400 ft.) x (6.52/1000 ohms per ft.)] x [(37 VA)/(24V)] = 4.02 volts

This means that four volts are going to be lost between the transformer and the controller. To assure the controller receives at least 20 volts, the transformer must output more than 24 volts. Because all transformer output voltage levels depend on the size of the connected load, a larger transformer outputs a higher voltage than a smaller one for a given load. Fig. 10 shows this voltage load dependence.

In the preceding I x R loss example, even though the controller load is only 37 VA, a standard 40 VA transformer is not sufficient due to the line-loss. Looking at Fig. 10, a 40 VA transformer is just under 100 percent loaded (for the 37 VA controller) and has a secondary voltage of 22.9 volts. (Use the lower edge of the shaded zone in Fig. 10 that represents the worst case conditions.) When the I x R loss of four volts is subtracted, only 18.9 volts reaches the controller. This is not enough voltage for proper operation.

In this situation, the engineer has three alternatives:

1. Use a larger transformer. For example, if an 80 VA model is used, an output of 24.4 volts, minus the four volt lineloss, supplies 20.4V to the controller (see Fig. 10). Although acceptable, the four-volt line-loss in this example is higher than recommended.

With 100 percent load, the transformer secondary must supply between 23 and 25 volts to meet the NEMA standard. When a purchased transformer meets the NEMA standard DC20-1986, the transformer voltage regulating ability can be considered reliable. Compliance with the NEMA standard is voluntary.

Fig. 10. NEMA Class 2 transformer voltage output limits.

The Honeywell transformers listed in Table 5 meet the NEMA standard DC20-1986.

Table 5. Honeywell transformers that meet

NEMA standard DC20-1986.

Transformer Type VA Rating

AT40A 40

AT72D 40

AT87A 50

AK3310 Assembly 100

IMPORTANT

No installation should be designed where the line-loss is greater than two volts. This allows for nominal operation if the primary voltage drops to 102 Vac (120 Vac minus 15 percent).

2. Use heavier gauge wire for the power run. 14 AWG (2.0 sq mm) wire has a resistance of 2.57 ohms per 1,000 ft. Using the preceding formula results in a lineloss of only 1.58 volts (compared with 4.02 volts). This would allow a 40 VA transformer to be used. 14 AWG (2.0 sq mm) wire is the recommended wire size for 24 Vac wiring.

3. Locate the transformer closer to the controller. This reduces the length of the wire run, and the line-loss.

The issue of line-loss is also important in the case of the output wiring connected to the Triac digital outputs. The same formula and method are used. Keep all power and output wire runs as short as practical. When necessary, use heavier gauge wire, a bigger transformer, or install the transformer closer to the controller.

To meet the National Electrical Manufacturers Association (NEMA) standards, a transformer must stay within the NEMA limits. The chart in Fig. 10 shows the required limits at various loads.

63-2689—05 8

NOTE: The AT88A and AT92A transformers do not meet

the voluntary NEMA standard DC20-1986.

Wiring

All wiring must comply with applicable electrical codes and ordinances, or as specified on installation wiring diagrams. Controller wiring is terminated to the screw terminal blocks located on the top and the bottom of the device.

Electrical Shock Hazard. Can cause severe injury, death or property damage.

Disconnect power supply before beginning wiring or making wiring connections, to prevent electrical shock or equipment damage.

NOTES:

— For multiple controllers operating from a single

transformer, the same side of the transformer secondary must be connected to the same power input terminal in each controller. Controller configurations will not necessarily be limited to three devices, but the total power draw, including accessories, cannot exceed 100 VA when powered by the same transformer (U.S. only). For power and wiring recommendations, See “Power”

+ 16 hidden pages