169 Relay Self-Test; Statistical Data Features - GE 169 Instruction Manual

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GE Power Management
3 SETUP AND USE
The 169 Plus relay has a selectable single-shot restart feature which will allow the motor to be restarted immediately
after an overload trip. To allow the motor to be restarted the relay decreases its internal value for motor thermal
capacity used. However if two overload trips occur within a lock-out time delay, the 169 Plus will not allow an
immediate restart. The displayed lock-out time must be allowed to run out before the motor can be restarted. This
feature can be selected in page 5 of SETPOINTS mode and is factory preset as disabled.
The 169 Plus also has a special external reset feature which can be selected in page 5 of SETPOINTS mode. When
this feature is enabled, shorting the External Reset terminals together causes all output relays to reset, while
pressing the reset key causes all relays except AUX. 1 to reset. This feature is factory preset as disabled.
Note: This feature works for 169 Plus relay trip functions only. Trip functions assigned to the TRIP & AUX. 1
output relays cannot be reset using the reset key.
If the 169 relay trips and then loses control power, the trip function will become active again once control power is re-
applied. For example, if a GROUND FAULT TRIP occurs and then control power for the relay is removed and later
returned, the message "GROUND FAULT TRIP" will appear on the display and the output relay assigned to the
Ground Fault Trip function will become active.
Note: If control power is removed for more than one hour after a trip the 169 relay will be reset when power
is re-applied (only on O/L trips).

3.23 169 Relay Self-Test

The 169 relay's internal circuitry self-test consists of three separate tests. A/D, RTD, and memory circuitry tests are
continually performed. The A/D test involves sending a known, precise voltage level through the A/D circuitry and
seeing if it is converted correctly. The RTD test involves reading a known, internal resistance and checking to see if
the correct temperature is determined. To test the memory circuitry, test data is stored in the 169 relay's non-volatile
RAM and is then read and compared with the original data.
Should any of these tests indicate an internal circuitry failure, the "SERVICE" LED will start to flash and the output
relay programmed for the self-test feature will activate.
Note: When a relay A/D or memory self-test failure occurs all metering and protective functions will be
suspended. The ACTUAL VALUES display for all parameters will be zero in order to avoid nuisance tripping.
When in this state the relay will not provide motor protection. If a memory failure occurs the factory
setpoints will be reloaded into the 169. If an RTD hardware failure occurs the "# OF STATOR RTDS USED"
setpoint will be automatically set to 0 and the RTD ALARM and TRIP levels will be automatically set to OFF;
however all current-related functions will continue to operate.

3.24 Statistical Data Features

The model 169 relay offers a record of maximum RTD temperatures and pre-trip current and RTD values while the
model 169 Plus relay offers, in addition, a full range of motor statistical data. The maximum RTD temperature data is
found on page 2 of ACTUAL VALUES mode and can be cleared to zero by storing a YES in response to the "CLEAR
LAST ACCESS DATA?" question at the end of page 2. Pre-trip motor current and temperature values are found in
ACTUAL VALUES mode, page 5. These values will be updated only when a relay trip occurs. Note that if a trip
function setpoint is set to INST. (instantaneous) and this type of trip occurs, the values for pre-trip current will not be
recorded exactly. This is because the relay has tripped instantaneously and thus did not have enough time to
update the registers holding this information.
On the model 169 Plus statistical data is found on page 4 of ACTUAL VALUES mode. All of this data can be cleared
to zero by storing a value of YES in response to the "START NEW COMMISSIONING?" question at the end of page
4.
All of the statistics in this page will reset to zero after reaching 255. The running hours data will reset to zero after
65535 hours.
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