Carbolite nanodac - Manual (Page 29)

nanodac™
27
MC27 –EN–1.04
4.4.8 Cascade Display Mode
This display mode appears only if ’Cascade’ has been enabled in the Instrument.Display area of
configuration. See also Advanced Loop configuration.
Figure 1.4.8a Cascade display mode
Operating the scroll button highlights the Master ‘Mode’ field. Operating the scroll button again, enters
edit mode allowing the user to use the up/down arrow buttons to scroll through the available modes.
Once the required mode appears, a further operation of the scroll button confirms the entry and quits edit
mode.
Once out of edit mode, the down arrow key can be used to select Master ‘SP1’, Slave ‘SP’ and Slave ‘Man
OP’. The Mode selected determines how many of these items are editable by the operator.
Mode Cascade: The master loop is in auto mode and provides the slave setpoint.
Changing modes causes the slave to switch to the local slave setpoint.
Slave: A simple single loop controlling with a local setpoint.
Manual: Provides a single manual % power output.
SP1 Setpoint 1 is the primary setpoint of the controller. If the controller is in automatic
control mode, then the difference between the setpoint and the process variable
(PV) is continuously monitored by the control algorithm. The difference between
the two is used to produce an output calculated to bring the PV to the setpoint as
quickly as possible without causing overshoot.
SP The slave setpoint, either local (Manual or Slave mode) in which case it can be
edited, or supplied by the master loop (Cascade mode), in which case it is not
editable.
Man.OP The percentage output power to be applied when in Manual mode (100% = full on;
0% = off).
Note: The default loop names (‘Master’ and ‘Slave’) can be replaced by user-entered strings of up
to 10 characters in Advanced Loop Setup configuration.
4.4.9 Programmer Display Mode
Mode
Sp1
SP
Man.OP
Inst name
PV
wSP
Master
PV
PSP
Program Name (Segment name) Program Name (Segment name)
Ramp
PV
PSP
PV
PSP
Program status Program edit