Programming
14
MC19-1.22
Power fail during Time-to-target segments: The ramp rate will be that of the current
segment. The ramp rate is maintained, but the time remaining is recalculated.
If there is a power interruption while controlling to Setpoint, when power is restored the
controller automatically calls for maximum power.
5.12 Alarms
Alarms are used to alert the operator when a pre-set level has been exceeded or a function
error has occurred such as a sensor break. They are indicated by a flashing red ALM
(Alarm) indicator. The alarm may also switch an output
– usually a relay to allow external
devices to operate when an alarm occurs. Alarms only operate if they have been configured
and are dependent on customer requirements.
How to acknowledge an alarm will depend on the type of latching which has been
configured. A non-latched alarm will reset itself when the alarm condition is removed. A
latched alarm requires acknowledgement with the “ACK” function (section 2.1) before it is
reset.
If an alarm has been activated the red “ALM” indicator will flash and the text will indicate the
type of alarm.
To acknowledge an alarm and cancel the “ALM” indicator, press
and
together.
5.13 Program Example 1
The following sequence of entries creates and runs the program shown graphically below.
1.
Turn the controller SP down to ‘0’ by pressing down
.
2.
Press page
until Prog, Segments Used is displayed. On P10 or P25 models press
up
or down
to select a new program number, (a program with only 1 segment).
3.
Press scroll
until Holdback Value is displayed. Default ‘0’ degrees.
4.
Press scroll
until Ramp Units is displayed. Press up
or down
to set to ‘Min’
5.
Press scroll
until Cycles is displayed. Default ‘1’
6.
Press scroll
until Segment 1 is displayed
7.
Press scroll
until Segment Type is displayed. Press up
or down
to select ‘Rate’
8.
Press scroll
until Holdback Type is displayed. Default ‘Off’
9.
Press scroll
until Target SP is displayed. Press up
or down
t
o set to ‘400’
degrees.
10.
Press scroll
until Ramp Rate is displayed. Press up
or down
to set to ‘5.0’
degrees per minute.
Repeat steps 6 to 10 for 4 more segments. Set Holdback to the default ‘Off’. Enter the
following parameters and values:
Segment Ty
pe Dwell Duration ‘30:00.0’ minutes
Segment Type Step Target SP ‘600’ degrees
Segment Type Dwell Duration ‘30:00.0’ minutes
Segment Type Time Target SP ‘200’ degrees, Duration ‘2:00:0’ hours
Summary of Contents for 3508 P1
Page 23: ...Navigation 23 MC19 1 20 ...
