Operating Tips - Hoffman Controls 890-DSQ Series Complete Installation & Operating Instructions

Operating Tips

Speed Adjustment
The speed at which the LCD screen's values change is variable.
Holding the UP or DOWN button down causes the dislayed
value to change slowly at first and then speed up noticably. When
making large value changes hold the button down until the
displayed number is close to the desired value. Then release the
button, wait 1 second, and press the button down again to slowly
reach the desired value.
Input Sensor Values Screen
An additional Input Sensor Values LCD screen is available and
can be displayed by pressing and releasing the UP button when the
Home Screen is present on the LCD. Pressing and releasing the
UP button again returns the LCD to the Home Screen.
The Input Sensor Values screen displays the active input
temperature sensor values in °F, rounded to the nearest °F, (no
decimal point). In pressure mode, the active input transducers
values are displayed in PSI, rounded to the nearest pound (no
decimal point).
Figure 9, Input Sensor Values Screen (next column) shows the
LCD screen when temperature sensors are used as inputs. Only
the active temperature sensor values are shown on the screen. In
this case, all six (6) temperature sensors have been installed and
selected. Uninstalled or unselected temperature sensor or pres-
sure transducer inputs are not shown on the Input Sensor Values
screen. NOTE: The displayed temperature values are the actual
temperatures in °F rounded to the nearest °F.
For example:
Displayed Value
53
47
The top line of numbers in Figure 9 shows the temperature
inputs T1 thru T4. Temperature input T1 is on the far left of
the top line on the LCD screen. Temperature input T4 is on
the far right of the top line on the LCD screen. The bottom
line of numbers, in Figure 9, starts with the actual maximum
temperature, in °F (with decimal point) obtained from the active
temperature sensors, followed by the T5 temperature input value
and the T6 temperature input value without decimal points. A
"T:" appears before the maximum temperature to indicate the
LCD screen is displaying temperature sensor values. A "P:" appears
on the LCD screen when pressure transducer values are being
displayed on the LCD screen.
Actual Temp
53.1°F
46.5°F
Input Sensor Values Screen
10-0 VDC NOTE:
If the installer has previously selected the 10-0 VDC output
option (10-0 VDC Output Seletion on page 9), he/she must dese-
lect the 10-0 VDC option (also within 10-0 VDC Output Seletion
on page 9), before changing the "Is Variable Stage Used?" option
(MODE 2.1 on page 4) back to No. Otherwise, the PWM and
VDC outputs will continue using the 10-0 VDC option.
19
FIGURE 9