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Deviation Mode
In deviation display mode, DPS3300 Series will show the differential between a pre-programmed setpoint and process
variable being monitored on each channel by the scanner. Individual setpoint for each channel is programmed during CH
Setup and can be any value over the range of selected scale or thermocouple being
used.
Types of Deviation Displays
There are two different ways of displaying channel deviation from their setpoint
values:
a) The first one is a momentary display in which the deviation is
indicated for a short time. Following this brief display time, the unit reverts to its
normal mode of operation (scanning, differential, timer etc.). To achieve this, first
select the channel whose setpoint deviation is desired. This is done by pushing the
CH. SEL key. Next, push the DATA key twice. The first push displays the
rate/minute value. The second push will display the deviation value. Before
showing the deviation, the display will read 'CH1 - SP' ( for CHannel 1 SetPoint).
b) The second method of displaying deviation is by selecting the 'dSP dEN' option when programming the
Display Option during the SYS Setup. If this method is selected, the display will scan through all the active channels and
display their deviation. The display format is 'd2 1234' (d stands for deviation).
The unit can also be put on HOLD at any channel by pushing the SCN/HLD key. If any other channel's deviation is
desired, it may be obtained by pushing the CH. SEL key. If an attempt is made to hold the display on a channel that has
been turned off, then the unit indicates this by displaying 'CHx OFF' (x=channel #). DPS3300 Series will keep track of
all other parameters while programmed for this mode (i.e. limits, peaks, rate, process value, channel differential etc). All
of these may be displayed by pushing the respective keys.
Difference Mode
In this mode the system continuously displays the difference of process variable
between any two selected channels. The two active channels are selected during
SYS Setup mode. To remind the operator of the current display mode and also
the two channels, the display flashes the channel numbers every few seconds
(e.g. 'CH1 - CH2' for displaying difference between channel #1 and channel #2).
If the unit is not programmed for difference mode, the differential between any
two of the seven channels can be briefly displayed by pressing the DATA key.
The procedure for doing so is to first select the channel whose differential with another channel is desired. This is done by
pushing CH SEL key. Each push on this key will display the selected channel in the format 'CHANEL x'(x=channel #).
When the desired channel has been selected, press the DATA key three times. The first push will display the rate of
process change on that channel. The second push will show the process deviation from the programmed setpoint. The third
push will flash a display of the form 'CH1 - CH2' and then a differential value. Additional pushes on DATA key will
sequence thru the channels and will be indicated as below:
CH1 - CH3, CH1 - CH4, CH1 - CH5, CH1 - CH6, CH1 - CH7, CH1 - SP
Setup mode provides a means to customize the monitor to suit a particular
application. It allows programming such parameters as temperature units, limits,
display mode, relay deadband, etc.
SETUP mode has 2 sections:
a) SYS setup section to set system parameters
b) CH setup section to set Channel parameters for each channel.