Checkout Procedure; Troubleshooting - Johnson Controls P352PN-2 Product Manual

C
heckout Procedure
Proportional-only and proportional plus integral
controls should be carefully set up and then check out
during system operation. Use the following guidelines
to check out the P352PN controls:
1. Before applying power, make sure installation and
wiring connections are according to job
specifications.
2. After all electrical connections have been checked,
and any necessary adjustments have been made,
put the system in operation and observe at least
three complete operating cycles to determine that
the system is stable.
3. If integration is required, select slow, medium, or
fast. The slow integration constant is the
recommended initial setting. (Refer to the
Integration Constant DIP Switch Settings section.)
4. Put the system back into operation. Observe system
operation and make any additional adjustments
necessary to obtain stable process control.
T
roubleshooting
If the System 350 control modules do not appear to
function properly, verify that the proper mode
(RA or DA) has been selected on each control module.
Then perform the following procedures (in the listed
order) 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.
!
WARNING: Risk of Electrical Shock.
To perform many of 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 control
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.
8
Basic Controls—P352PN Electronic Proportional Plus Integral Pressure Controls for PSI Applications
Equipment Needed:
•
reliable pressure gauge connected near the
transducer
•
reliable and accurate Digital Voltmeter (DVM)
capable of measuring AC voltage and DC voltages
down to + or – 0.1 VDC in the 0 to 10 VDC range
1. Check for proper supply voltage to the P352
Control.
a. Before powering control and equipment, check
to assure that all of the wiring is correct and all
of the connections are tight.
b. 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 P352 control, select AC volts on the DVM.
The voltage should be between 20 and 30 VAC.
If a Y350R Power Module powers the P352
control, select DC volts on the DVM. The
voltage should be between 16 and 38 VDC.
c. If the DVM reading is within the indicated
voltage range, proceed to Step 2.
d. 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 the for proper supply voltage to the
pressure transducer.
a. Select DC volts on the DVM and measure the
voltage between VDC and the COM terminals
on the terminal block on the upper left side of
the control.
The voltage should be 5.0 VDC
(+ or – 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 between VDC and the
COM terminals on the terminal block on the
upper left side of the control.
The voltage should be 5.0 VDC
(+ or – 0.1 VDC). If the voltage is in this range,
replace the transducer.
c. If the voltage is out of range, replace the
control.