Installation and operating manual
EN
34 DRYPOINT
®
AC 410 – 495 | DRYPOINT
®
AC 410 – 495 MS
4.6. Alarm inputs
The control unit features 2 alarm inputs. Terminal X11- 2 is connected to the condensate drain alarm device.
Terminals X13- 2 and X13- 3 are connected to a differential pressure alarm device (optional). The differential
pressure alarm is not configured in DRYPOINT
®
AC models. Both alarm inputs are NC contacts. This means that,
if they are not wired for alarm input, they must be configured with a wire bridge. NC contacts are used to provide
wire-break protection.
If an alarm is triggered, the alarm output (terminal X8) is switched. The alarm switches a floating contact
(changeover). The user is warned by a red LED in the housing cover that an alarm has occurred (with standard and
load-dependent control).
4.7. Software-generated alarms (with dew point control only)
The control system features a number of safety functions. If certain faults occur, an alarm signal is generated. This
applies to the following functions:
• Dew point transmitter open
• Short circuit at dew point transmitter
• Dew point preliminary alarm
• Dew point alarm
4.8. Intermittent operation
If terminals
X12- 2 and X12- 3
are connected to a floating contact of the compressor
(open when compressor
is running)
, intermittent operation is active (see also “2.3.2.5. Intermittent operation”). The compressor runtime is
determined as the total runtime from the start of the pressure build-up phase. At the end of the adsorption phase,
the system determines whether the runtime was longer or shorter than the set factor (e.g. 1 minute). If the runtime
is shorter, the control system automatically closes the regeneration valves and sets the system to
STAND-BY
mode.
When the compressor restarts the next pressure build-up cycle (i.e. air is extracted), the program continues and the
system resumes operation.
4.9. Behaviour in the event of a power failure
The control system includes an intelligent data saving system. In the event of a mains voltage dip or failure, the
control system saves all relevant data. When the power returns, the control system initiates a pressure build-up and
then continues operation from the point at which the interruption occurred.
5. Start-up
5.1. Commissioning
Before commissioning the plant, ensure that the pressure vessels are equipped with the necessary safety devices,
e.g. devices to prevent excessive pressure, safety valve, etc.
These devices are not included in the scope of delivery of the plant.
To prevent any problems during commissioning, we recommend having the plant commissioned by BEKO service
technicians.
To commission the plant, observe the instructions in “1.4. Transport and storage” and perform the tasks below in
the prescribed sequence:
1. Make sure that valves A and B in the bypass line (optional) are closed and that the electronic control system is
switched off.