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HVAC Drive H300 309
Issue Number: 3
Th Short Circuit Motor thermistor short circuit
25
This trip indicates that a temperature sensor connected to an analogue input or terminal 15 on the position feedback
interface has a low impedance (i.e. < 50 Ω). The cause of the trip can be identified by the sub-trip number.
Recommended actions:
• Check thermistor continuity
• Replace motor / motor thermistor
Thermistor
Motor thermistor over-temperature
24
The Thermistor trip indicates that the motor thermistor connected to terminal 8 (analog input 3) on the control connections
or terminal 15 on the encoder terminal (15 way D-type connector) has indicated a motor over temperature. The cause of the
trip can be identified by the sub-trip number
Recommended actions:
• Check motor temperature
• Check threshold level (07.048)
• Check thermistor continuity
Undefined Drive has tripped and the cause of the trip is Undefined
110
The Undefined trip indicates that the power system has generated but did not identify the trip the power system. The cause
of the trip is unknown.
Recommended actions:
• Hardware fault – return the drive to the supplier
User 24V User 24 V supply is not present on control terminals (1,2)
91
A User 24 V trip is initiated, if User Supply Select (Pr 06.072) is set to 1 or Low Under Voltage Threshold Select (06.067) =
1 and no user 24 V supply is present on control terminals 1 and 2.
Recommended actions:
• Ensure the user 24 V supply is present on control terminals 1 (0V) and 2 (24 V)
Trip Diagnosis
Sub-trip Reason
3
Analog Input 3 Mode (07.015) = 7 and the resistance of the thermistor connected to analog input 3 is
less than 50 Ω.
4
P1 Thermistor Short Circuit Detect (03.123) = 1 and the resistance of the thermistor connected to the
drive P1 position feedback interface is less than 50 Ω.
Sub-trip Reason
3 Trip initiated from analog input 3
4 Trip initiated from P1 position feedback interface
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