OPERATOR MANUAL // SECTION 3
TROUBLESHOOTING AND MAINTENANCE
HONEYWELL
22
SECTION 3
TROUBLESHOOTING AND MAINTENANCE
3.1
Model SS4-AS/-AS2 Detector Faults
The Model SS4-AS/-AS2 Detector issues a Fault (or Trouble) condition by de-
energizing the Fault Relay (J5 connector). The following are Detector Faults:
a. Temperature Fault:
The Detector faults if the internal temperature
during operation rises above 85°C or falls below -40°C causing both
LEDs to blink rapidly. Corrective action for this type of fault requires
factory re-certification.
b. Excessive Input Voltage Fault:
The Detector faults if the input voltage
is too high (greater than 45 Volts) causing both LEDs blink rapidly.
Corrective action for this type of fault requires factory re-certification.
c. Low Input Voltage Fault:
The Detector faults if the input voltage too
low. The user should check the voltage between Pins 1 and 4 of the
power connector J1 or J2. In this case one LED is on until the fault is
corrected. If the voltage is below 15 Volts the user should check the
wiring and the power supply.
d. No Power Fault:
The Detector faults if the input voltage is interrupted or
turned off causing the absence of LED indication. The user should
measure the voltage between Pins 1 and 4 of the power connector J1 or
J2. If none or very low voltage is measured, the user should check the
wiring and the power supply.
e. Detector Fault:
The Detector faults if its Optical Sensors fail the
automatic built-in “through the lens” test. In this case one LED is on until
the fault is corrected. The user should first clean both inside and outside
of the lens thoroughly, then clean the exposed surface of the Detector
sensors and the protective grill mounted on the outside of the housing
cover. If the fault has not been eliminated after re-assembly and
powering up for 10 to 15 minutes, factory service may be necessary.
f. Relay Fault:
The Detector faults if one of its Relay circuits fails. In this
case one LED is on until the fault is corrected. The user should return
the unit to the factory for service.
g. Self-Checking Fault:
The Detector faults if its internal microprocessor
finds a failure during self-checking of the hardware and software. In this
case one LED is on until the fault is corrected. This type of fault may be
caused by a number of reasons. The user should verify proper grounding
of the device and the absence of noise on the power cables. If fault
persists the user should return the Detector to the factory for service.
h. Analog “0” current:
All the above faults will produce an output current
loss (0 + 0.6mA) with the 4-20 mA module option.
