Orion-system SA E-BUS Controller Bedienungsanleitung PDF herunterladen (Seite 53)

SA E-BUS Controller Technical Guide

Sequence of Operations

Force Modes or Overrides

Warning: No equipment protection is available during the

Force Mode of operation. That means you could start a compressor

without running the Supply Fan or could create other conditions

that WILL damage the equipment. WattMaster Controls assumes

no responsibility or liability for the misuse of Overrides that cause

damage to the equipment!

The SA E-BUS Controller relay and analog outputs can be user-over-

ridden if the Modular Service Tool or the Prism Computer Front-End

Software is used. The System Manager cannot be used for these Force

Modes. The Modes of operation for the relays are as follows:

0 = Normal Operation

1 = Forced ON

2 = Forced OFF

The Analog Outputs are Forced when you specify a value between 0.0

and 10.0 VDC. To cancel the Force Mode, you must enter a value less

than zero, such as -1.0 VDC.

When the Analog Outputs are Forced, the display on the Modular Service

Tool or Prism program can be interpreted as the actual voltage. During

normal operation, the display indicates the percentage signal applied

based on the user-deﬁ ned voltage limits. For example, if you deﬁ ne a

2.0 VDC to 10.0 VDC range, then 50% would be 6.0 VDC instead of

the 5.0 VDC applied when the range is 0.0 VDC to 10.0 VDC.

As previously mentioned, Force Modes can only be activated when us-

ing either the Modular Service Tool or the Prism Computer Front-End

Software. Furthermore, the Override condition can only remain in effect

as long as one of these Operator Interface devices is connected and com-

municating with the SA E-BUS Controller. That means that you cannot

Force an Override condition and then walk away from the equipment

with the Override still active. The loss of communications, removal,

or shutdown of the Operator Interface will automatically terminate the

Override within 10 minutes. This protects the equipment and prevents

an Override condition from remaining active indeﬁ nitely, resulting in

inefﬁ cient or dangerous operation of the equipment.

VAV Terminal Unit Controller

Compatibility

The SA E-BUS Controller is designed to communicate with Orion

VAV/Zone Controllers. The SA E-BUS Controller can be conﬁ gured to

broadcast its Internal Schedule, Time, and Date, Fan and Heat Status, and

Supply Air Temperature. The SA E-BUS Controller can also broadcast

Force to Max or Force to Fixed Position during Morning Warm-up.

The Orion VAV/Zone Controllers broadcast Push-Button Overrides

from Unoccupied to Occupied. The controllers can also generate Unoc-

cupied Heating and Cooling calls to the SA E-BUS Controller based

on Setbacks.

If you are using another manufacturer’s VAV Terminal Unit Controllers,

the SA E-BUS Controller can activate a relay to inform the VAV/Zone

Controllers that the SA E-BUS Controller is operating in Warm-up Mode.

No other information can be passed between the SA E-BUS Control-

ler and the other manufacturer’s VAV Terminal Unit Controllers. This

means that Overrides or Unoccupied Heating and Cooling calls cannot

activate the SA E-BUS Controller. If you need any of these capabilities,

you must use only Orion VAV/Zone Controllers for controlling all of

your VAV Terminal Units.

VAV/Zone System

When the SA E-BUS Controller goes into the Occupied Mode, it initiates

Morning Warm-up if the Entering Air Temperature is below the Morning

Warm-up Target Temperature Setpoint. During Morning Warm-Up, the

VAV/Zone Controllers will modulate open if the Space Temperatures

are too cold. They can also move to their Maximum Airﬂ ow or Fixed

Airﬂ ow Position Setpoint if they receive this broadcast from the SA E-

BUS Controller. Once Morning Warm-up has been satisﬁ ed, the SA E-

BUS Controller enters the Cooling Mode and the VAV/Zone Controllers

will modulate to satisfy their Space Temperature Setpoints. If the Space

Temperature falls below the Heating Setpoint, staged or modulating

Reheat can be activated to warm the space.

Communications between the SA E-BUS Controller and the VAV/Zone

Controllers are handled by the MiniLink Polling Device. Alarm Polling

and Tenant Overrides are also monitored by the MiniLink Polling Device.

Tenant Overrides are overrides generated by the Space Temperature Sen-

sor’s push button. The MiniLink Polling Device records the start and stop

times and total run times of the overrides on a daily and monthly basis.

A computer running Prism Computer Front-End Software is required to

retrieve all data acquired by the MiniLink Polling Device.

Zoning System

The SA E-BUS Controller automatically conﬁ gures itself for Voting

Control when the MiniLink Polling Device is installed and is conﬁ gured

as a Voting System. The SA E-BUS Controller sets the HVAC Mode

Enable to the Entering Air Temperature Sensor as soon as communica-

tion is acquired with the MiniLink Polling Device. If the VAV/Zone

controllers are conﬁ gured for Voting, the MiniLink Polling Device totals

the Heating and Cooling demands and determines which HVAC Mode

the SA E-BUS Controller should be in. The MiniLink Polling Device

broadcasts a forced Heating, Cooling, or Vent Mode of operation to

the SA E-BUS Controller. Once the SA E-BUS Controller receives the

broadcast to set the HVAC Mode, it operates as previously described in

the SA E-BUS Controller Sequence of Operations. If communications

are lost, the SA E-BUS Controller returns to its own control and will

maintain the HVAC Mode Enable Setpoints by using the Entering Air

Temperature Sensor as the Controlling Sensor.

VAV Applications

1 2 ... 48 49 50 51 52 53 54 55 56 57 58 ... 73 74

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