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

			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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