WIRING
The DHC uses a standard 15 pin male high density D-Sub connector available from
most electronic distributors. A pre-wired 18˝ cable is included with each unit. See
below table for cable color wiring information.
ISOLATION Zones: Each zone has 500 VAC isolation from all other zones.
4-20 mA Transmitter – Check the specifications for the device receiving this signal for
input resistance. Typical 250 to 600 Ω, 600 Ω maximum.
OPERATION
Setting Set Points and Alarms
The
hot key provides direct access to the Set Point and Alarm MENU. The Set
Point and Alarm MENUS that are displayed are based upon the Set Point (SP) and
Alarm (AL) SUB MENUs. Reference the
“SPAL MENU”
diagram under the
Menu
Structure
section for the complete menu structure.
Set Point Adjustment
Adjusting the DHC set points is quick and simple. Instead of setting a set point and
deadband, simply adjust “SP1T” or “SP2T” for the desired trigger point, and then
adjust “SP1R” or “SP2R” for the desired reset point. The associated LED will light up
green when the set point is triggered.
Using Figure 5 as an example, an instrument with a 1 in w.c. range would have the
set point 1 turn on at 0.9 in w.c. and off at 0.85 in w.c. SP1T sets the turn on point and
SP1R sets the turn off point. This represents a typical rising pressure set point. The
second portion shows set point 2 turn on at 0.1 in w.c. and off at 0.15 in w.c. SP2T
sets the turn on point, and SP2R sets the turn off point. This represents a typical falling
pressure set point. Either set point can trigger a relay if selected in the rLy1 or rLy2
menus.
The input power polarity is unimportant.
NOTICE
Wire in accordance with an equivalent national standard or code.
Use copper conductors rated for 60°C. All terminals are rated
CLASS 2.
CAUTION
Function
15 Pin Connector
Terminal
Cable Color
12-28 VAC/VDC Power
12-28 VAC/VDC Power
4-20 mA Output Signal
0-10 V Output Signal
External Input Signal
Signal Common
Relay #1 N/O
Relay #1 Common
Relay #1 N/C
Relay #2 N/O
Relay #2 Common
Relay #2 N/C
RS-485 B(+)
RS-485 A(-)
RS-485 Common
1
6
11
7
8
2
12
13
14
15
10
5
4
3
9
Brown
Yellow
Red
Light Purple
Light Green
Black
Violet
Grey
White
Dark Blue
Dark Green
Orange
Tan
Pink
Light Blue
KEY FUNCTIONS
Keys
Home Position
Function
Main Menu
Function
Sub Menu
Function
Edit Setting
Function
Edit Value
Function
SP/AL
Allows access
to the Set Point
and Alarm
menus
MENU
Allows access
to the menus
Return
to home
position
Return to
previous
menu
Cancel edit,
return to sub
Menu
Cancel edit,
return to sub
Menu
UP
ARROW
Sequences
through
menus
Sequences
through sub
menus
Previous
option
Increment
the value
DOWN
ARROW
Sequences
through
menus
Sequences
through sub
menus
Next option Decrement
the value
ENTER
Display full-
scale range of
unit
Enter into
sub menu
Enter edit
function for
setting
Accept the
current
option
Short press:
Move caron
to next digit.
Long Press:
Accept the
current value
RESET
Clear or reset
an Alarm (alarm
set for manual
reset)
Peak/Valley
sub menu
resets display
to present
value
Zone Inputs/Outputs
1
2
3
4
5
Power (1,6)
Current (2,11); Voltage (7); External Input (8)
Relay 1 (12,13,14)
Relay 2 (5,10,15)
RS-485 (3,4,9)
SP2 DESCRIPTOR
SP1 DESCRIPTOR
INPUT VALUE
UNITS
EXTERNAL INPUT
ALARM DESCRIPTOR
MULTIPLIER
DESCRIPTOR
VISABLE WITH
SOME VELOCITY
AND FLOW RANGES
FRONT PANEL
Figure 5: Set points
PRESSURE
SP1T
SP1R
SP2T
SP2R
TIME
1.0
0.8
0.6
0.4
0.2
0
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