Sterling 30RA010-055 Fault Codes, •P50: FAULT HISTORY — Last 8 faults, •P51: SOFTWARE version

Table 37 — Fault Codes

FAULT CODE	DESCRIPTION	SOLUTION
AF	High Temperature Fault: Ambient temperature is too high;	Check cooling fan operation
	Cooling fan has failed (if equipped).
CF	Control Fault: A blank EPM, or an EPM with corrupted data	Perform a factory reset using Parameter 48 —
	has been installed.	PROGRAM SELECTION.
cF	Incompatibility Fault: An EPM with an incompatible parame-	Either remove the EPM or perform a factory
	ter version has been installed.	reset (Parameter 48) to change the parameter
		version of the EPM to match the parameter
		version of the drive.
CL	CURRENT LIMIT: The output current has exceeded the	Check for loose electrical connections.
	CURRENT LIMIT setting (Parameter 25) and the drive is	Check for faulty condenser fan motor.
	reducing the output frequency to reduce the output current.	Check Parameter P25 from Table 38 is set cor-
	If the drive remains in CURRENT LIMIT too long, it can trip	rectly.
	into a CURRENT OVERLOAD fault (PF).
GF	Data Fault: User data and OEM defaults in the EPM are	Restore factory defaults P48, see section
	corrupted.	above. If that does not work, replace EPM.
HF	High DC Bus Voltage Fault: Line voltage is too high; Decel-	Check line voltage — set P01 appropriately
	eration rate is too fast; Overhauling load.
JF	Serial Fault: The watchdog timer has timed out, indicating	Check serial connection (computer)
	that the serial link has been lost.	Check settings for PXX.
		Check settings in communication software to
		match PXX.
LF	Low DC Bus Voltage Fault: Line voltage is too low.	Check line voltage — set P01 appropriately
OF	Output Transistor Fault: Phase to phase or phase to ground	Reduce boost or increase acceleration values.
	short circuit on the output; Failed output transistor; Boost	If unsuccessful, replace drive.
	settings are too high; Acceleration rate is too fast.
PF	Current Overload Fault: VFD is undersized for the applica-	Check line voltage — set P01 appropriately
	tion; Mechanical problem with the driven equipment.	Check for dirty coils
		Check for motor bearing failure
SF	Single-phase Fault: Single-phase input power has been	Check input power phasing
	applied to a three-phase drive.
F1	EPM Fault: The EPM is missing or damaged.
F2-F9, Fo	Internal Faults: The control board has sensed a problem	Consult factory
Drive display = 60.0 even though it	Feedback signal is above set point	Check for proper set point
is cold outside and it should be run-		Check liquid line pressure
ning slower
Drive display = ‘---’ even though	Start jumper is missing	Replace start jumper. See section above
drive should be running
Drive display = 8.0 even though fan	Feedback signal is below set point and fan is at minimum	Check for proper set point
should be running faster	speed	Check liquid line pressure
VFD flashes 57 and LCS	Feedback or speed signal lost. Drive will operate at 57 Hz	In stand alone mode: Check transducer wiring
	until reset or loss of start command. Resetting requires	and feedback voltage. Feedback voltage dis-
	cycling start command (or power).	played on P-69. Pin 6 should be 5 v output.
		Pin 5 (feedback) should be somewhere
		between 0 and 5 v.

Manual Reset — If fault condition has been removed, cycle power to the chiller to reset the VFD.

Troubleshooting — Troubleshooting the Motormaster® V control requires a combination of observing system operation and VFD information. The drive provides 2 kinds of trouble- shooting modes: a status matrix using the 3-digit display (P57, P58) and real time monitoring of key inputs and outputs. The collective group is displayed through parameters 50-60 and all values are read-only.

•P50: FAULT HISTORY — Last 8 faults

•P51: SOFTWARE version

•P52: DC BUS VOLTAGE — in percent of nominal. Usually rated input voltage x 1.4

•P53: MOTOR VOLAGE — in percent of rated output voltage

•P54: LOAD — in percent of drives rated output current rating

•P55: VDC INPUT — in percent of maximum input: 100 will indicate full scale which is 5 v

•P56 4-20 mA INPUT — in percent of maximum input. 20% = 4 mA, 100% = 20 mA

Manual Starter Trip — If the VFD manual starter (MS-FC- HS, MS-FC-A1 or MS-FC-B1 depending on model) trips, locate the inrush current protectors (3 round black disks per motor) and verify their resistance. For units operating at 208 v or 230 v, these devices should measure approximately 7 ohms. For all other voltages, they should measure approximately 20 ohms. Check value with mating plug disconnected, power to chiller off and at ambient temperature (not hot immediately after stopping VFD). These are standard resistances at 77 F (25 C). Resistance values decrease at higher temperatures and increase at lower temperatures.

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