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

PS1

PS2

ARPB

SPARE

NOTE:

The general alarm contact is a normally open dry contact which is wired to terminals #16

and #17.