Honeywell UDC2500 manual 20Setpoint Rate, Power Outage, Power outages

Models: UDC2500

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Monitoring and Operating the Controller

 

 

 

 

 

 

 

 

Step

Operation

Press

Result

 

 

6

End the Ramp

 

When the final setpoint is reached, “RUN” changes to

 

 

 

 

 

“HOLD” in the upper display and the controller operates

 

 

 

 

 

at the new final setpoint.

 

 

7

Disable SPRAMP

 

See Section 3 – Configuration group “SPRAMP” for

 

 

 

 

 

details.

 

Power Outage

If power is lost during a ramp, upon power-up the controller will be in HOLD and the setpoint value will be the setpoint value prior to the beginning of the setpoint ramp.

The ramp is placed in hold at the beginning.

Configure the mode at Set Up Group “CONTROL”, function prompt “PWRUP”. See Subsection 3.11 – CONTRL GROUP FUNCTION Prompts.

4.20Setpoint Rate

Introduction

When you have configured a SETPOINT RATE, it will apply immediately to local setpoint change.

Configuration check

Make sure:

SPRATE is enabled

SP RATE and SPPROG are not running.

A Rate Up (EUHRUP) or Rate Down (EUHRDN) value has been configured in Engineering units per hour.

ATTENTION

A value of 0 will imply an immediate change in setpoint, that is, NO RATE applies. See Subsection 3.5 – Configuration group “SPRAMP” for details.)

Operation

When a change to local setpoint is made, this controller will ramp from the original setpoint to the “target” setpoint at the rate specified.

The current setpoint value can be viewed at Sn on the lower display.

Power outages

If power is lost before the “target” setpoint is reached, upon power recovery, the controller powers up with Sn = Current PV value and it automatically “Restarts” from Sn = current PV value up to the original “target” setpoint.

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UDC2500 Universal Digital Controller Product Manual

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Page 131
Image 131
Honeywell UDC2500 manual 20Setpoint Rate, Power Outage, Power outages