Emerson iPro SERIES Technical Information PDF herunterladen (Seite 15)

Technical Information

D7.21.2/1011/E

15/17

7 Troubleshooting

Flash

code

Alarm conditions

Possible failure reasons

Troubleshooting measures

Insufficient oil

pressure

Warning: Appears when the

differential oil pressure is less than

0.48 – 0.62 bar for 4 seconds.

Lockout: Appears when the

differential oil pressure is less than

0.48 – 0.62 bar for 2 minutes

continuous, or intermittent but

determined to be unsafe.

Loose wiring connections between

CoreSense™ module and oil

sensor.

Faulty oil sensor (missing O-ring

or clogged sensor screen).

Faulty oil pump.

Clogged strainer screen or worn

bearings.

Verify the oil level present in the sight glass. If the oil is not present, resolve reservoir

oil supply problem or oil level control setting issues.

Verify that the harness is fully engaged to the sensor.

Measure oil pump differential pressure. If less than 7 to 9 psi, inspect for clogged oil

screen, faulty oil pump, liquid floodback or worn bearings.

If good oil pressure exists, measure resistance across the oil sensor while the

compressor runs. If the sensor resistance is "open" inspect for clogged sensor screen

or missing O-ring.

If sensor resistance is "closed", temporarily jumper across the harness connector pins

(do not damage the pins!) while the compressor runs. If the oil warning does not go

away, verify harness connector engagement at the module circuit board.

Motor overheat

Trip: Appears when the PTC

Thermistor resistance is > 4.5 kΩ.

Lockout: Appears when 10

consecutive motor overheat trip

alarms occur.

Motor rotor is mechanically

seized.

Open circuit in harness.

Connector pin not engaging at

connector on control module

Faulty CoreSense™ module.

In case of trip alarm, allow the motor to cool down for a minimum of 2 minutes (it may

take longer) and the compressor will start automatically.

In case of lockout alarm or multiple trips, check PTC resistance when the motor is cold

(off for at least an hour). If resistance is high, inspect for faulty sensor or loose

connection under terminal plate.

If resistance is low, inspect for loose terminal strip connections, harness connection

failure at circuit board, open harness circuit or high motor temp due to return gas

temperature, motor voltage or load condition.

Discharge temp

protection

Warning: When the discharge

temperature sensor is defective or

disconnected.

Trip/Lockout: When the discharge

temperature is > 154°C for 2

seconds.

Open discharge probe (faulty).

The probe connection has not

been made to the harness

connector.

The connector is not plugged into

the CoreSense™ circuit board.

The Discharge temperature has

exceeded the maximum limit

154°C.

Blocked condenser.

Possible loss of refrigerant.

If there is a warning, verify proper probe connection to the harness and proper

harness connection into the circuit board.

If there is a warning, unplug the discharge temp probe and verify if the resistance of

the probe is as specified vs its approximate ambient temperature.

If the probe resistance is correct inspect the harness connector receptacle for damage

and apply NyoGel 760G connector lubricant.

Trip or Lockout: resolve system issues (high superheat, high head pressure), inspect

for mechanical damage that can lead to high temps (valve plate gasket, suction or

discharge valve failure).

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