Van Air Systems FR-1600 User Manual
Page 13
PAGE 13
10.2 CHECKING THE SMARTRELAY
The dryer control is comprised of three different systems:
1. The SmartRelay
2. Input devices (115VAC components)
a. Pressure switches
b. Alarm Reset push-button
d. Power switch
3. Output components (115VAC components)
a. Pilot valves
b. Lights
c. General alarm contact
The SmartRelay controls the cycling of the dryer system. The
program logic is stored on an electrically erasable non-volatile EE-
PROM. Loss of power will not cause loss of the program.
If the LCD display on the SmartRelay is not lit, the Smart Relay
is not operating. If this occurs, check fuse 1FU and replace as
needed. If there is power to the SmartRelay and is still does not
function, consult factory.
See
SECTION 10.2A and 10.2B for procedures to verify the opera-
tion of the input and output devices.
10.2A TESTING THE INPUT DEVICES
The input devices supply a 115VAC signal to the Smart Relay.
See
FIGURE 10B for a list of the input devices.
The input devices can be easily tested for proper operation. With
power to the control box, set the Power switch to the ON position.
Press the Alarm Reset Pushbutton and verify that there is 115VAC
between terminals #9 and #12. If there is no voltage, replace the
Alarm Reset Pushbutton.
Pushing the manual override of SV1 should cause the left tower inlet
valve to close. Pushing the manual override of SV2 should cause
the right tower inlet valve to close. If this does not happen, replace
that solenoid valve.
With the Power switch (SW) in the
ON position and the dryer system
pressurized, monitor the dryer system for one complete cycle. SV1
should be activated when the right tower is on-line drying process
air. SV2 should be activated when the left tower is on-line drying
process air. These two operations can be monitored in one 10 min-
ute cycle. Reference
FIGURE 6C for dryer timing chart.
If the above responses are not observed, first check to see if power
is being supplied to each solenoid valve when it is supposed to
close. Check the wiring between the SmartRelay and solenoid
valves. If the SmartRelay is not supplying power to the valve as it
should, replace the SmartRelay. If the valve has power but does not
operate, it must be replaced.
TROUBLESHOOTING
SECTION 10
FIGURE 10A SMARTRELAY DETAIL
The pressure switches monitor the failure to switch option. The
inputs from the pressure switches (PS1, PS2) can be observed
while the dryer system is in operation. Any time there is more
than 30 psig pressure in the left tower, pressure switch (PS1)
should supply a 115VAC signal to Smart Relay terminal I1. Any
time there is more than 30 psig pressure in the right tower, pres-
sure switch (PS2) should supply a 115VAC signal to SmartRelay
termial I2. If either of the pressure switches does not respond
as previously explained, check the wiring to the pressure switch.
If the wiring and device are good, theSmartRelay is faulty and
should be replaced. Reference
FIGURE 10D WIRING DIAGRAM
for wiring and terminal numbers.
10.2B TESTING THE OUTPUT DEVICES
The SmartRelay’s outputs are 115VAC. See
FIGURE 10B for a list
of the dryer system output devices.
To check output devices SV1 thru SV2, follow the procedures in
SECTIONS 10.3 & 10.4.
INPUTS
POWER
LCD
DISPLAY
CONTROL
BUTTONS
OUTPUTS
10.3 CHECKING THE 3-WAY PILOT VALVES
(SV1 & SV2) TOWER CHANGEOVER
All 3-way pilot valves have manual override buttons on the top of the
valve. To test SV1 and SV2 do the following:
Make sure the dryer system is pressurized and the Power switch is
in the
OFF position. Both towers should be at full line pressure
OUTPUT DEVICES
Q1 SV1
Q2 SV2
Q3 PL2
Q4 ALARM CONTACT
FIGURE 10B INPUT AND OUTPUT LIST
INPUT DEVICES
I1
PS1
I2
PS2
I3
ARPB
I4
SPARE
I5
SPARE
I6
SPARE
I7
SPARE
I8
SPARE
NOTE:
The general alarm contact is a normally open dry contact which is wired to terminals #16
and #17.