Honeywell UDC2500 manual Setting Failsafe Mode, Setpoint Rate/Ramp/Program Overview, PV Hot Start

Monitoring and Operating the Controller

4.17 Setting Failsafe Mode

Introduction

You can set the Failsafe Mode to be Latching or Non-Latching.

Set Failsafe Mode

Table 4-23 Procedure for Setting a Failsafe Mode

Step

Operation

Press

Result

1Select Control Set-up Group

2Select Failsafe

Function Prompt

Setup

Function

Until you see:

Upper Display = SET

Lower Display = CONTRL

You will see: Upper Display =

LACH (Controller goes to manual and output goes to failsafe value)

NO L (Controller mode does not change and output goes to failsafe value)

Lower Display = FSMODE

3	Select a value	or	To select a failsafe mode in the upper display.
4	Return to Normal		At power up, the output will go to the value set.
		Lower
	Display	Display

4.18 Setpoint Rate/Ramp/Program Overview

Introduction

The Setpoint Ramp configuration group lets you enable and configure any of the following:

•SPRATE – a specific rate of change for any local setpoint change. (Subsection 4.20)

•SPRAMP – a single setpoint ramp that occurs between the current local setpoint and a final local setpoint over a time interval of 1 to 255 minutes. (Subsection 4.19)

•SPPROG – a ramp/soak profile in a 12-segment program. (Subsection 4.21)

This section explains the operation of each selection and configuration reference where necessary.

PV Hot Start

This is a standard feature. At power-up, the setpoint is set to the current PV value and the Rate or Ramp or Program then starts from this value.

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