8
Basic Controls—System 350 P352AB Electronic Pressure Control Series Product/Technical Bulletin
C
heckout Procedure
Before applying power, make sure installation and
wiring connections are according to job specifications.
After necessary adjustments and electrical
connections have been made, put the system in
operation and observe at least three complete
operating cycles before leaving the installation.
T
roubleshooting
If the System 350 control modules do not appear to
function properly, verify that the proper mode (DA or
RA) has been selected on each control module. Then
perform the following procedures to determine the
problem.
IMPORTANT:
The control and the controlled
equipment must be powered and
operating at a stable pressure to
perform many of the following
procedures.
Equipment Needed:
•
A reliable pressure gauge connected near the
transducer.
•
A reliable and accurate Digital Voltmeter (DVM)
capable of measuring AC voltage and DC voltages
down to ± 0.1 VDC in the 0 to 10 VDC range.
!
WARNING:
Risk of Electrical Shock.
To perform the following
procedures it is necessary to
power the control and the
controlled equipment while the
control cover is removed. Do not
touch any exposed metal
components with anything other
than properly insulated tools or
insulated probes of the digital
voltage meter. Failure to use
properly insulated tools and
probes can result in severe
electrical shock if live line voltage
parts are contacted.
1. Check for proper supply voltage to the Control.
a. Before powering control and equipment, check
that all of the wiring is correct and all of the
connections are tight.
b. Apply power to the control.
c. With the DVM, check the voltage between the
24V and the COM terminals on the terminal
block on the upper left side of the control.
If an external 24 VAC transformer powers
the control
, select AC volts on the DVM. The
voltage must be between 20 and 30 VAC.
If a Y350R Power Module powers the
control
, select DC volts on the DVM. The
voltage must be between 16 and 38 VDC.
d. If the DVM reading is within the indicated
voltage range, proceed to Step 2.
e. If the DVM reading is
not
within the indicated
voltage ranges, replace the external
transformer or the Y350R Power Module, and
recheck for proper supply voltage.
2. Check for proper supply voltage to the
pressure transducer.
a. Select DC volts on the DVM and measure the
voltage (
VDC
S
) between VDC and the COM
terminals on the terminal block on the upper
left side of the control.
The voltage must be 5.0 VDC (± 0.1 VDC).
If the voltage is in this range proceed to
Step 3.
b. If the voltage is out of this range, power down
the controlled equipment and disconnect it
from the control. Disconnect the transducer
from the control. With the control powered,
measure the voltage (
VDC
S
) between VDC
and the COM terminals on the terminal block
on the upper left side of the control.
The voltage must be 5.0 VDC (± 0.1 VDC).
If the voltage is in this range, replace the
transducer. If the voltage is out of range,
replace the control.
3. Check pressure transducer for proper output
signal voltage.
a. Measure and record the voltage (
Vo
) between
the SEN and the COM terminals on the control
terminal block.
b. At the same time, observe and record the
pressure reading (
psi
T
) on the gauge.