Gardner Denver DGH Series, Инструкция по эксплуатации

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5. Controllers – General
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5. Controllers – General
5. Controllers – General
5.1
Overview
Solid-state dryer controls are located in a polycarbonate, NEMA
Class 4/4X, IP66 rated electrical enclosure mounted to a center
panel located between the two desiccant towers. Controls are
available in two functional levels. Both controls offer four fixed-
time cycles that provide dew points corresponding to ISO
compressed air quality classes 1 through 4. A key difference
between the two controls is the way in which they address
energy savings. When inlet flow is less than the adjusted rated
capacity of the dryer, average purge air requirements are
reduced. This reduction can translate to energy savings at the air
compressor.
The Level 1 Controller offers 8 selectable fixed-cycle Energy
(purge) Saver modes (0% to 70% in 10 % increments) to reduce
purge time to match the load on the dryer.
Level 2 Controllers feature the Automatic Purge Saving System
(APSS) as described in Sections 3.2 and 3.4. When Level 2
Controllers are operated in demand rather than fixed cycle
modes, the APSS automatically adjusts to dryer loading and
extends drying time when possible. Average purge use is thus
automatically reduced.
A feature-by-feature comparison of Level 1 and 2 Controllers can
be found in Table 5-1.
Desiccant Dryer Controllers
Category Feature
Level 1
Fixed Cycle Only
Level 2
Fixed Cycle
and APSS
AC Input voltage: 85-264 VAC, 47-63 Hz (See Note 1) 9 9
DC Input voltage: 11.5- 28 VDC (See Note 1) 9 9
Auxiliary power terminals (See Note 2)
9 9
Solenoid valve coil voltage 12 VDC 12 VDC
NEMA 4/4X, IP 66 electrical enclosure rating 9 9
Soft on/off switch with two power recovery modes (See Note 3) 9 9
Tower status LEDs (green=drying, amber=regenerating)
9 9
Process valve status LEDs (on = valve open, off = valve closed)
9 9
Operating mode LEDs (see next category for number of modes) 9
Alarm LED (red) 9 9
Voltage-free alarm contacts, 5A rating
9 9
Alarm reset switch (mounted on front panel)
9 9
Service reminder LEDs (See Note 4) 9 9
General
Vacuum fluorescent text display 9
60-150 or 120-250 psig MOP (selectable via jumper on circuit board) 9 9
ISO Class 1 (-100°F/-73°C PDPT) – fixed cycle (4 minute) 9 9
ISO Class 2 (-40°F/-40°C PDPT) – fixed cycle (10 minute) 9 9
ISO Class 3 (-4°F/-20°C PDPT) – fixed cycle (16 minute)
9 9
ISO Class 4 (+38°F/+3°C PDPT) – fixed cycle (24 minute) 9 9
Fixed cycle Energy (purge) Saver (See Note 6) 9
Manual cycle (test mode) 9 9
ISO Class 2 (-40°F/-40°C PDPT) – demand cycle
9
ISO Class 3 (-4°F/-20°C PDPT) – demand cycle
9
Operating Modes
(See Note 5)
ISO Class 4 (+38°F/+3°C PDPT) – demand cycle 9
Controlled shutdown and restart (upon user supplied contact closure)
9 9
Tower pressure switches (2)
9 9
High humidity or dew point alarm Optional
Filter monitor alarm (1 or 2 filters) Optional
Electric drain alarm (1 or 2 filters) Optional
Digital I/O
Electric drain test (1 or 2 filters) Optional
Thermistors (4) 9
Analog input #1 (0-5 VDC) Dew point transmitter Optional
Analog input #2 (0-5 VDC) Pressure transducer Optional
Analog I/O
(12 bit accuracy)
Analog input #3 (0-5 VDC) Temperature sensor Optional
Communication RS232 communication port
9 9
Table 5-1 (continued on next page)
Feature Comparison – Level 1 and 2 Controllers