INSTALLATION, START-UP & MAINTENANCE MANUAL
MODEL NO.: SD-820 / SD-1710
REV 1 – AUGUST 03,.2001
Page 19
SECTION 3
3.2.5 Electrical control
Danger!
Work on electrical installations may only be done by a
specialist or by other persons instructed in this type of
work as long as they are under the instruction and
supervision of a specialist; the general rules for working
with electricity must be followed!
You find the corresponding operating and control voltage on the data sheet.
The
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adsorption dryer of the SD series is normally operated with a PLC
controller. The set times are adjusted at the factory during the test run.
Do not change these adjustments!
3.3 SPECIAL EQUIPMENT
3.3.1 DDS Controls
The DDS control option is a Dewpoint Dependant Switching system that monitors the
dryer dewpoint performance and manages the requirement for regeneration of the
dryer. The DDS controls major components are a digital dewpoint display hygrometer
and a humidity sensor.
The
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type SD Air dryer is designed to provide a specific pressure dewpoint
performance (generally –40 F (-40 C)) at the most severe operating conditions
specified. (Maximum flow at lowest pressure and highest inlet temperature). The
regeneration purge flow rate required for the dryer is calculated and adjusted to achieve
this dewpoint and is based on these conditions.
For example, for dryers operating at 100 PSIG (690 kPa) and 100 F (38 C) the purge
flow rate is approximately 15% of the specified maximum inlet flow. Dryers operating
under less severe inlet conditions will introduce a reduced humidity load. The DDS
controls have been factory programmed to monitor the dryer outlet dewpoint
performance and prevent initiation of a regeneration cycle under these conditions.
The DDS controls system has the following standard features, refer to the enclosed
technical bulletin for a complete overview of the digital hygrometer display.
Digital display can be toggled to degrees F, C, and PPM.
Detection for cable fault between hygrometer and moisture probe.
Stainless steel humidity probe sampling cell with service valves.
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