Sullair 02250201-297 R01, User Manual

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Section 3
31
CONTROLLER FOR REFRIGERANT DRYERS
CONTROLLER
E-680 is designed as a controller for refrigerant type
compressed air dryers. The controller has 8
temperature sensor inputs. Each channel can be
configured for type J, type K thermocouple or Pt-100
resistance thermometer. These inputs are used to
measure the temperatures at various points in the
dryer. The controller has also 8 digital (relay) outputs
and 16 digital inputs. The digital outputs are taken
through the normally open contacts of the output
relays. The contact rating of the output relays are
10A at 250 V AC Digital inputs are activated by 24V
DC or AC.
The controller has an RS-485 communication
interface that can be used for remotely monitoring
channel temperatures, set points, input and output
states. Modbus RTU protocol is used for
communication.
The front panel of the controller contains a four line
20 character LCD display and 10 buttons that are
used in configuration and manual control operations.
The dimensions of the controller are 3.8 x 7.6 in / 96
x 192 mm (front panel) with a depth of 4.3 in / 110
mm. The panel cutout should be 3.5 x 7.2 in / 90x185
mm. The operating voltage of the controller is 20 -
60V AC or 20 - 85V DC.
3.1 OPERATION
The front panel view of E-680 controller is given in
Figure 3-1 . The front panel of the controller contains
a four line 20 character LCD display, 9 buttons and
one alarm indicator LED.
Figure 3-1: The Front Panel View of E-680 Controller
The buttons below the LCD display ( , , ,
and ) are used in configuration operations.
button is used for manual control of the drain
output. While in normal operation, the drain output is
controlled according to the configured “drain on” and
“drain off” periods. When button is pressed the
drain output is activated even if the dryer is in off state.