Hoffman Controls 890-DSQ Series Complete Installation & Operating Instructions page 8

Operating Modes Con't
MODE 6: Special Settings:
MODBUS, I&O, RESET
This mode has 10 menus and is used to set the following options:
• Lockout code activation.
• Modbus slave's address, baud rate and parity.
• Input sensor type (temperature or pressure).
• Relay stage's sequence mode (FIFO, FILO or Binary
Encode).
• Scale the sequencer's variable stage PWM and VDC output
to match the variable stage's, continuously variable speed, EC
motors' full speed, minimum speed and off percentages
• 10 - 0 VDC output selection (by inverting the PWM and 0-
10 VDC output signals).
• Reset the sequencer to factory settings.
The LCD screen sequences thru the following menu and
submenu screens, with each press of the ENTER button. Press the
ENTER button to continue.
Lockout Code Enabled?
1)
No
Use the UP or DOWN button to enable (activate) or
disable (de-activate) the Lockout Code. The options are:
"Yes" or "No". Then press the ENTER button to con-
tinue,
2) MODBUS Address: 1
Use the UP and DOWN buttons to set a unique
Modbus slave address for this particular 890-DSQ
Sequencer. (Range is 1 to 247). Then press the ENTER
button to continue.
3) MODBUS Baud Rate
19200
Use the UP and DOWN buttons to select the Modbus
baud rate. The choices are 1200, 2400, 4800, 9600, 19200,
38400, 57600 and 115200. When remotely setting the baud
rate value, a number code, from 0 to 7, is used. Refer to
TABLE 1, Baud Rate Codes below, to view the available 890-
DSQ Sequencer's baud rates and their associated number codes.
The default baud rate is 19200. Press the ENTER button after
making your selection.
Code Baud Rate
0 1200
1 2400
2 4800
3 9600
Baud Rate Codes
TABLE 1
4) MODBUS Parity
Even Parity
Use the UP and DOWN buttons to set the Modbus parity.
The choices are even parity, odd parity and no parity with 2
Code Baud Rate
4 19200
5 38400
6 57600
7 115200
stop bits. Then press the ENTER button to save the selected
parity and continue.
5) Change Sensor
Type: Temperature
Use the UP and DOWN buttons to change the input sensor
type. (Choices are temperature or pressure). When the sensor
type is changed from temperature to pressure, or vice versa, the
Emergency On value is reset to either the temperature based
Emergency On value or the selected maximum pressure value.
Press the ENTER button to save the selected sensor type and
continue. If "pressure" is selected, then another menu appears,
requesting the maximum pressure rating of the transducer(s)
used. Select the appropriate value from 100 PSI to 1000 PSI.
6) Relay Sequence
Mode: FILO
Use the UP and DOWN buttons to change the order in
which the relay stages turn on and off. (Choices are FILO,
FIFO and Binary Encode).
FILO mode means the last relay stage to turn on will be the
first relay stage to turn off.
FIFO mode means the first stage to turn on will be the first
stage to turn off. FIFO mode promotes even load operation
(wear) by using each stage an equal amount of time, on aver-
age, by turning on whatever stage has been off the longest and
turning off whatever stage has been on the longest.
Binary Encode
mode uses the Base 2 number counting
system. Binary encode mode is used when the sequenced loads
are a ranged in a 1, 2, 4 weighted ratio (Each load has twice
the capacity of the previous load). This allows the sequencer to
operate 7 stepped loads using only 3 relay output stages (or up
to 12 sequencer loads using 4 relay stages).
Press the ENTER button to save the selected relay sequence
and continue.
VarFan SpdLimits OutputHigh: 95
7)
Scales the sequencer's PWM and VDC output signals to
match the selected VS (variable stage) EC motor's full speed
control signal's percentage. For example:
If the VS EC motor goes to full speed as the input signal
rises to 92% PWM or 9.2 VDC, then the VarFan SpdLimits
OutputHigh: number should be set at 92.
NOTE:
The LCD's Home Screen will show
ing the EC motor is running at 100% full speed. However, the
PWM and VDC output signals will remain set at 92% PWM
and 9.2 VDC as the sequencer's selected input signal continues
to rise.
8) VarFan SpdLimits OutputLow: 20
Scales the sequencer's PWM and VDC output signals to
match the selected VS (variable stage) EC motor's minimum
(low) speed control signal's percentage.
For example:
If the VS EC motor goes to minimum speed as the motor's
input signal drops to 15% PWM or 1.5 VDC, then the
VarFan SpdLimits OutputLow: number should be set at 15.
8
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VS: 100 indicat-