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

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Pre-Installation Information/
Instruction Con't
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IMPORTANT:
When using replacement EC motors, review the sys-
tem's current protection device's capability to ensure
the protection devices can handle the much larger in-
rush current experienced during EC motor line
voltage power up

Operating Methods

The 890 sequencer's operation is organized into two sections:
local and remote, with each section containing the same selectable
modes, menus, submenus, settings and numerical values.
The 890-DSQ Sequencer controls its operation by using the
information stored within its micro controller's 76 internal data
registers. These data registers are numbered from 0 to 75, with
each register's data contents representing a unique sequencer func-
tion or numerical value.
Each 890-DSQ sequencer's micro controller is programmed, at
the factory, with the internal register data needed for that sequenc-
er's anticipated application. However, the pre-programmed data
can be changed, during or after installation, by manually and/or
remotely updating the micro controller's internal register data.
Manually updating the internal register data is accomplished by
viewing and then responding to the LCD screen's information and
appropriately pressing one or more of the sequencer's five push
buttons.
Manual operation starts with the LCD's Home Screen (Figure
1). The Home Screen displays the number of fixed relay stages
turned on, along with the maximum number of selected stages,
(Stages On: 1/4), along with the selected input type (Tmp, PSI or
VDC) and that input's present value (Tmp: 53.1).
Figure 1
LCD Home Screen
.
Local Operation
3
When selected, the LCD's Home Screen also displays the variable
stage's percent of operation (VS: 75) along with a number repre-
senting the total of all of the fixed relay stages and effective variable
stages that are turned on (2.5). Refer to Mode 2.2, on pages 4 & 5,
for a description of effective variable stage operation.
The sequencer's MODE button is used to sequentially cycle thru
the LCD screen's six (6) available modes. Pressing the MODE but-
ton once advances the LCD's screen to the "To Test Fans Press
Enter" screen (Mode 1). Slowly pressing the MODE button repeat-
edly, cycles the sequencer thru its six (6) available modes and then
back to the Home Screen.
Remotely updating the 890-DSQ Sequencer's internal register
data requires connecting the sequencer to a Modbus RTU master
computer that can send new register data to, and/or read current
register data from, the 890 micro controller's internal memory.
NOTE:
Since the 890-DSQ's operation is controlled by the
data stored within its internal registers, the sequencer provides the
same identical operation whether the register data is changed locally
(manually) or remotely.
In both local and remote operation the 890-DSQ Sequencer can
be setup to select 1) fan testing, 2) traditional or continuous VS
(variable stage) operation 3) the number and type of outputs used,
4) the number and type of inputs used, 5) the primary, and/or
secondary set point values used, 6) the Modbus communication
parameters and 7) 0 - 10 VDC or 10 - 0 VDC output selection.
Local operation uses the control's five push buttons (MODE,
UP, DOWN, EXIT & ENTER) along with the LCD screen's
information to display and select the sequencer's operating modes,
menus, submenus, options and numerical values.
Each mode has several menus, with some menus having a
number of submenus. Each press of the MODE button displays
the next operating mode's title on the LCD screen. Pressing the
ENTER button, while a particular operating mode's screen is
visible on the LCD, displays that mode's first menu. Pressing the
ENTER button again will display the next menu or submenu asso-
ciated with that mode. The installer can update the displayed menu
options and/or submenu options and numerical values by pressing
the UP or DOWN buttons.
Whenever a menu screen is displayed, each press of the UP
or DOWN buttons incrementally cycles thru that menu's avail-
able options. The UP button advances the displayed options in a
forward direction while the DOWN button does the reverse.
submenu screen
Whenever a
UP or DOWN buttons incrementally cycles thru that sub-menu's
available options or numerical values. Pressing the UP button either
1) cycles forward thru the available options or 2) increases the
displayed value. Pressing the DOWN button either 1) cycles back-
ward thru the available options or 2) decreases the displayed value.
Once an option or numerical value has been updated, pressing
the ENTER button, again, will save the new value and move the
control's operation forward to the next submenu, menu or mode.
Pressing the EXIT button, at any time, causes the control to
return immediately to the Home Screen. However, any options
or value changes that were not saved, by previously pressing the
ENTER button, will be lost.
is displayed, each press of the