Carrier JK034-074, 50FK, 48FK Ð Variable Frequency Drive Terminal Block Size 034-048 Units

P24 RES	RR F	R	SI	S2	S3 S4 RCH P24 LOW LOW
ST FM	AM CC	CC	RX	PP	IV FP FLC FLB FLA

4-20mA

Fig. 53 Ð Variable Frequency Drive Terminal Block

(Size 034-048 Units)

P24 RES	RR F	R	SI	S2	S3 S4 RCH P24 LOW LOW
ST FM	AM CC	CC	RX	PP	IV FP FLC FLB FLA

4-20mA

Fig. 54 Ð Variable Frequency Drive Terminal Block

(Size 054-104 Units)

VFD Operation Ð When troubleshooting the VFD, check ®rst that all required conditions for VFD operation are satis®ed.

For the VFD to run, the following conditions must be met at the VFD:

1.	Drive enable jumper is installed from terminals CC-ST
	(factory supplied) (see Fig. 53 and 54).
2.	Proper rotation jumper is installed at terminals R-CC (re-
	verse rotation, factory supplied) or terminals F-CC (for-
	ward rotation, factory supplied).
	UNIT SIZES	ROTATION	JUMPER
	034-048	Reverse	R-CC
	054-074	Forward	F-CC
	078-104	Forward	F-CC
3.	Emergency stop jumper is installed from terminals S4-CC
	(factory supplied).
4.	A 4 to 20 mA signal is applied across terminals IV-C (from
	pressure transducer, factory supplied).
5.	DIP switch SW1 (located on the VFD's printed circuit
	control panel) must be set to ``I'' (indicating usage of a
	4 to 20 mA input signal at terminals ``IV'').
6.	Speed Control (located on the VFD's keypad/display) set
	for ``Remote'' (press the ``Speed Ctrl'' button until LED
	``Remote'' is illuminated).
7.	Programmed according to Carrier defaults.
8.	Duct Pressure set point established by user, or use fac-
	tory default (30 Hz indicating 2.50-in. wg) (see Table 13).

VFD Operational Status Ð The VFDs contain ex- tensive self-diagnostic functions which are accessed through the VFD display panel (located on the front of the VFD or at a remote location when the accessory remote display pack- age has been installed).

If using the VFD display panel, disconnect all power to the unit and the VFD before entering unit, or use the accessory remote display module. Disable supply fan and motor operation before accessing VFD-mounted dis- play module.

When power is ®rst supplied to the VFD, the display au- tomatically starts with the frequency monitor function of its standard monitor mode. In the frequency monitor function, the output frequency is displayed. Push the S/P/M (Setup/ Program/Monitor) key to switch to the Mode Selection menu. Push the S/P/M key again to toggle the display back to the standard monitor mode.

From the Mode Selection menu, the service person can view all of the monitored status variables, including up to four user-selected variables and any trip history in the memory.

Refer to the separate VFD Operation Manual for detailed instructions on accessing diagnostic information, initiating troubleshooting, and clearing any trip history.

Restoring Factory VFD Defaults Ð The original factory con®guration values are saved in the memory of the VFD and can be restored by the service person if required. There are two types of saved ®le data: Carrier-factory set- tings (factory programmed settings made to the VFD which apply speci®cally to the unit it is installed on) and standard defaults for general Carrier unit use.

The Carrier-factory settings are maintained as user set- tings. These can be restored by entering the Setup mode (in the S/P/M menu) and setting parameter tYP = 6 on the keypad/ display. This will recall the speci®c factory defaults for this unit.

Occasionally it may be necessary to restore the VFD de- faults to the general Carrier use values. These are stored in an OPTION ROM (read-only memory chip). However, some variables may need to be manually changed to match the speci®c unit's factory default settings. To recall the general Carrier defaults, enter the Setup mode and set parameter tYP = 3. Refer to Table 30 for items requiring manual adjustment.

Table 30 Ð Required User Adjusted Defaults

SIZES		ITEM
All	Motor overload settings (see Table 31)
	1.	Check jumper CC-F
054-104	2.	Gr.UT/bLSF = 1
	3.	Gr.SF/Sr.n = 1
	4.	Gr.SF/SrN1 = 0
	5.	SEtP/tYP = 5 (Save User Settings)

Table 31 Ð Motor Overload Settings

	UNIT		IFM HP
	VOLTAGE
			DESIGNATION	tHr1
UNIT 48/50	DESIGNATION	AND
				SETTING
	Model No.		Model No.
	Position 12		Position 15
FK,FY, JK,JY	5	And	N	82.0
	5	And	Q	86.0
	6	And	A	80.0
	6	And	K	80.0
	6	And	Q	80.0
FKX,FKY,	6	And	Q	80.0
JKX,JKY
	6	And	T	78.0

LEGEND

IFM Ð Indoor Fan Motor

Unit Wiring Ð A typical wiring schematic is shown in Fig. 55.

54