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345 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
M5 RELAY MAINTENANCE
CHAPTER 7: MAINTENANCE
M5 Relay maintenance
Ambient temperature
The SR3 has a temperature monitor feature that measures the ambient temperature
around the chassis of the relay. The relay extrapolates the ambient temperature from an
internal temperature sensor inside the product. This feature can be used to signal the
customer that the product is being subjected to temperatures that can degrade the
product life and proper action should be initiated. For example the air conditioning,
heating or ventilation system should be checked.
The purpose of the feature is to measure the immediate temperature around the product.
There are several factors that can alter the measurement that need to be considered for
the application of this feature.
•
Any forced air flow or obstructions that can interrupt even distribution of the ambient
temperature.
•
Installation of the relay should be for normal operation (CT, VT, inputs, outputs).
PATH
:
MAINTENANCE > M5 RELAY MAINTENANCE > AMBIENT TEMP
AMBIENT TEMPERATURE
Range: Disabled, Alarm, Latched Alarm
Default: Disabled
This setting enables the ambient temperature functionality. If the operating condition is
satisfied when
Alarm
is selected as the function, the “ALARM” LED will flash upon the
activating condition, and will automatically reset when the condition clears. If
Latched
Alarm
is selected, the LED “ALARM” will flash upon the activating condition, and will stay
“ON” after the condition clears, until a reset command is initiated. Any assignable output
relays can be selected to operate when this function is enabled.
HI ALARM LEVEL
Range: 20°C to 80°C in steps of 1°C
Default: 60°C
This setting specifies the temperature level monitored by the Ambient Temperature
Alarm high logic. The alarm will occur when the temperature remains above this level.
LOW ALARM LEVEL
Range: -40°C to 20°C in steps of 1°C
Default: 10°C
This setting specifies the temperature level monitored by the Ambient Temperature
Alarm low logic. The alarm will occur when the temperature remains below this level.
HYSTERESIS LEVEL
Range: 2°C to 10°C in steps of 1°C
Default: 2°C
This setting allows the user to select the dropout level for the feature.
TIME DELAY
Range: 1 to 60 min in steps of 1 min
Default: 1 sec
This timer starts when either the high or low level thresholds have exceeded their
respective levels.