7
e.
Check Alarm/Service light if illuminated, check Interface
panel.
1)
If SERVICE DRYER appears, scheduled
maintenance time has elapsed (HRS TO
SERVICE is 0). Perform needed service and
reset service interval (see B.3.).
2)
If ALARM appears, a dryer fault is indicated; see
Troubleshooting Guide for possible remedies.
After fault correction push Reset button to turn
Fault alarm off.
Type of FAULTS:
LOW PRESSURE - the refrigeration compressor
control circuit has opened because of low suction
pressure.
HIGH PRESSURE - the refrigeration compressor
control circuit has opened because of high head
pressure. The high pressure switch must be reset
manually once the fault is corrected. Red reset
button is located on pressure switch inside unit.
HIGH TEMPERATURE - compressed air
temperature is above the set point.
COMPRESSOR - Normally open (NO) auxiliary
contact on the compressor contactor is open
when the dryer is on.
HEATER - Normally closed (NC) auxiliary contact
on the compressor contactor is open when the
dryer is off.
TEMP SENSOR - Occurs if the temperature
sensor circuit is open or shorted. If open, the left-
most LED in the temperature display will be
illuminated. If shorted, all the LEDs in the
temperature display will be illuminated.
DRAIN - electric drain contains a high water level
alarm that activates if drain fails to discharge.
f.
Check drain operation - push Drain (push-to-test)
button to energize electric drain. A flow of condensate
and/or air should be present at the drain outlet.
E.
Using the RS-232 port
The RS-232 port is used to monitor dryer operation from a
host computer. A (1 to 1) DB-9 cable is required to
connect dryer and computer. For PC connections, data is
transmitted on pin 2, received on pin 3, ground is pin 5,
pins 7 and 8 are jumpered at dryer.
Operation is at fixed baud rate of 9,600; asynchronous
format is 8 bit, no parity, 1 stop bit (“8,N,1”). No check sum
or error correction values are provided. If required, request
status string two (or more) times and compare for agree-
ment.
Request data by sending ASCII ? character (3FH). Re-
sponse may take up to two seconds as certain processing
functions may require completion before serial port is
acknowledged.
Dryer responds with line feed (0AH), carriage return (0DH),
and character string: (1), (2), (3), (4), (5), (6), (7), (8), (9)
(1) = STX (start-of-text character, may appear as a smiley
face or some other character
(2) = 108, Control board ID
(3) = 0 or 1, Compressor running status (0=off, 1=on)
(4) = M or S, Operating Mode (M= MANUAL OVERRIDE,
S = SCHEDULE RUNNING)
(5) = xxxx, HOURS TO SERVICE
(6) = xxxxxx, TOTAL HOURS
(7) = xx, Alarm or Service Code (0=no alarm, 30=LOW
PRESSURE ALARM, 31=HIGH PRESSURE ALARM,
32=COMPRESSOR ALARM, 36=HIGH EVAP TEMP
ALARM, 37=HEATER ALARM, 38=DRAIN ALARM,
39=SERVICE DRYER, 41=TEMP SENSOR ALARM)
(8) = xx.x, Evaporator temperature (°F)
(9) = ETX, (end-of-text character, may appear as a heart
or some other character)
Содержание HPRP 1000
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