E-680 CONTROLLER FOR REFRIGERANT DRYERS SECTION 4
160
“drain off” periods. When button is pressed the
drain output is activated even if the dryer is in off
state.
The dryer is automatically stopped if an anomaly is
detected. In that case, the alarm output and the
alarm indicator LED on the front panel become
activated. In order to restart the dryer, alarm should
be acknowledged and “restart delay” period should
be timed out. Pressing button acknowledges the
alarm and deenergizes the alarm output and alarm
LED.
and buttons are used for starting and stopping
the dryer respectively. If the dryer is stopped
manually, it can not be started before “restart delay”
period is timed out.
4.2.1 1. EXTERNAL CONNECTIONS
The back panel view and the connection terminals of
E-680 controller are given in Figure 4-2.
Figure 4-2: The Backpanel View of E-680 Controller
T
ERMINALS IN THE UPPER ROW
These terminals are used for temperature sensors
(Pt-100).
Spare channels are measured by the controller, but
can not be monitored and sensor break for these
channels has no effect on the operation of the
controller.
T
ERMINALS IN THE MIDDLE ROW
These terminals are used for digital outputs and
digital inputs. The names and the functions in the
order of the terminal numbers are given in the
following table.
-02+
-01+
-08+
-03+
-04+
-05+ -06+
-07+
01 Inlet Air Temperature.
02 Exchanger Temperature.
03 Low Pressure Line Temperature.
04 High Pressure Line Temperature.
05 Ambient Temperature.
06 Auxiliary Channel Temperature. This tempera-
ture can be monitored, but sensor break has no
effect on the operation of the controller.
07 Spare Channel 1.
08 Spare Channel 2.
T.No Name Function
1 COMM. For D. Out 1-4
2 COMM. For D. Out 1-4
3 D. OUTPUT 1 Compressor Motor
4 D. OUTPUT 2 Drain Output (Normal)
5 D. OUTPUT 3 Dryer is Running.
6 D. OUTPUT 4 Dryer is Stoppd. In case of
fault, the output flashes.
7-
8 COMM. For D. Out 5-8
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