Troubleshooting; Operation; Maintenance - PCB Piezotronics ICP RHM240A01 Installation And Operating Manual

9.0 TROUBLESHOOTING

When a PCB signal conditioner with any of the following
indicators are used, turn the power on and observe the
voltmeter (or LED's) on the front panel. Typical indicators are
marked as shown in the figure below.
Normal Operation
INDICATOR DVM
READING
GREEN (Mid- 8 to 14 V
Scale)
GREEN 3 to 7 V
(Low End)
GREEN 15 to 17 V
(High End)
RED 0 Volts
YELLOW 24 to 28 V
Output voltage moves from YELLOW to GREEN slowly until
charging is complete. AC coupled signal conditioners require
sufficient time to charge the internal coupling capacitor. Allow
signal conditioner to charge for after 5 discharge time
constants for stable operation.
Note: Most PCB strain sensors have an output bias of 8-14
VDC. Refer to the specification sheet in this manual for the
bias range of the model you are using. If you are using a low
bias sensor, the indicator will be at the bottom end of the green
portion of the dial indicator, and may even be in the red
portion. This is the expected range and indicates proper
operation. Initial application of mounting torque will incur a
negative-going output voltage. It is necessary to allow this
output voltage to decay 5 DTC's prior to making
measurements in order to prevent baseline shift where an
absolute zero is needed throughout entire monitoring process.

10.0 MAINTENANCE

The sensor connector must be kept clean, especially if it is
operating in a dusty and/or wet environment. If the cable is
disconnected from the sensor, it is recommended to place the
supplied black cap onto
contamination.

ICP QUARTZ STRAIN SENSOR OPERATION MANUAL

OPERATION

Proper range for most ICP
sensors.
Proper range for low bias
ICP sensors.
Proper range for high bias
ICP sensors.
Short in the sensor, cable, or
connections.
Open circuit in the sensor,
cable, or connections.
(Excitation voltage is being
monitored.)
the connector to
Observe the following precautions when using the sensor:
A. Do not exceed the maximum strain levels for the strain
sensor (see specification sheet).
B. Do not subject the sensor to temperatures exceeding that of
the specification, normally 250°F (121°C).
C. Do not apply voltage to the sensor without current-limiting
diodes or other current protection.
D. Do not apply more than 20 mA of current to the strain
sensor.
E. When mounting the strain sensor, observe installation
procedures detailed in Section 3.0 and as outlined on the
specific sensor Installation Drawing to avoid over torquing
when mounting.
F. Do not apply more than 30 volts to the sensor.
G. Avoid metal-to-metal impacts during applications, which
can produce a high frequency ringing. Electrical low-pass
filtering or a damping material can help reduce such effects.
E. Do not spin the sensor onto the cable. This may fatigue the
cable center pin, causing cable damage. Always insert the
cable pin into the sensor and tighten the knurled cable nut to
the sensor.
For additional information, refer to "Warranty, Service,
Repair and Return Policies and Instructions."
MANUAL NUMBER: 22676
MANUAL REVISION:
ECN NUMBER:
prevent
B
54044
5