Carrier PC 111 Fig. 56 Variable Frequency Drive Terminal Block

56

POWER EXHAUST FAN MOTOR NO. 1 OVERLOADPROTECTION — The VFD provides operating overloadprotection for the supply fan motor. The factory has pro-grammed the power exhaust VFD overload function to matchthe factory-installed motor (motor size and efficiency). If thepower exhaust fan motor is changed from the original factoryselection, the overload value may need to be changed by theservice person. Contact your local Carrier representative forassistance in determining the proper overload setting.NOTE: Variable frequency drive size is matched to factory-installed motor size. Do not increase motor size without alsochanging to equivalent VFD size.Table 33 — Carrier Power Exhaust VFD Default Program Parameter Values

*These settings differ from the Toshiba defaults and are required for Carrier applications.

NOTE: To restore original factory settings, change tYP to 6 in SEtup mode (SEtP).

This restores the VFD original factory settings.

PARAMETER GROUP PARAMETER DEFAULT VALUE

SEtP

(Setup)

ACC1 60.0 Sec

DEC1 60.0 Sec

UL 59.8 Hz

LL 10.0 Hz*

Luln 1

P3 20%

F-P3 0.0 Hz

P4 98%

F-P4 60 Hz

tHr1 See Table 35

StC1 0

StL1 110%

OLN 1

tYP 5*

Gr.F

(Fundamental)

FH 60 Hz

Pt 12

Gr.Fb

(Feedback)

FbP1 1*

Fbin 2

GP .30

Gl 2 sec

GA 0

GFS 80

P1LL 10

PuL 1

PuUl 10

PuLL 10

Gr.SF

(Frequency Settings) Fsor 60 Hz

Gr.Pn

(Panel Control) Fr 0*

Gr.St

(Terminal Selection)

1t 1

1t0 0

1t1 56

1t2 13

1t3 3

1t4 10

Ot1 4*

Ot2 2*

Ot2d 5*

Ot2H 100*

LF 15*

Gr.Pr

(Protection)

UuC 1*

UuCt 2

ArSt 3

Gr.Ut

(Utility)

Cnod 1*

Fnod 2*

bLPn 1*

4-20mA

P24 RES RR F

ST FM AMCC CC

RSI

RX

S2 S3

PP

S4 RCH P24 LOWLOW

FLA

FLB

FLC

FP

IV

C

A

Fig. 56 — Variable Frequency Drive Terminal Block

Contents

Main Controls Operation, and Troubleshooting CONTENTS 48FK,JK034-104 48FM078-104 50FK,FY,JK,JY034-104 50FM,FS078-104 Variable-Air Volume Rooftop Units CONTENTS (cont) SAFETY CONSIDERATIONS GENERAL Rooftop Information VAV Control System Processor Board Fig. 1 Processor Board Page Relay Board Display Board Thermistors Table 3 Output Pin and Terminal Assignments Fig. 5 Relay Board Compressor Operation Accessory Board Single-Step Demand Limit Demand Limit Control Module (DLCM) Page Page Economizer Page Supply Fan Variable Frequency Drive (VFD) High Capacity Modulating Power Exhaust Variable Frequency Drive (48FM and 50FM,FS Units Only) Temperature Reset CONTROLS INSTALLATION Control Wiring Space Temperature Reset Page Page Page Page Demand Limit Control From Remote Building Management System (BMS) [(P3 SASP) X(0.6 F) X (TR R@13.3) ] Smoke Control Modes Page Air Pressure Tubing 034-048 UNITS Fig. 32 Smoke Control Wiring 054-104 UNITS 48FK, JK AND 50FK, JK034-104 UNITS 48FM, AND 50FM, FS034-104 UNITS START-UP Initial Check Configuration Header DIP Switches Adjusting Set Points Potentiometers Supply Fan Control with IGV Option Supply Fan Control with VFD Option STOP RESET RUN READ WRITE Modulating Power Exhaust (Option or Acces- sory) (48FK,JK and 50FK,JK Units) The Mod- High Capacity Power Exhaust (48FM and 50FM,FS Units) The power exhaust VFD will modu- START UNIT Quick Test Program Turn on power to unit. Table 16 Quick Test, Unit Configuration and Switch Check Table 17 Quick Test, Thermistor and Potentiometer Check Table 18 Quick Test, Output Relay Check OPERATING INFORMATION Digital Display The VAV control system uses a 2-digit Operating Sequence The sequence presented be- Head Pressure Control All units have as standard a Page Supply Fan Control with IGV In most VAV units, Supply Fan Control with VFD When equipped Modulating Power Exhaust (48FK,JK and 50FK,JK Units Option or Accessory) The pow- High Capacity Modulating Power Exhaust (48FM and 50 FM,FS Units) The high-capacity Unit Staging Compressor loading and unloading se- Page Page Page Table 20 Compressor Loading and Unloading Sequences Fig. 48 Modulating Power Exhaust Return End Sheet Metal Skin Detail; 48FM and 50FM,FS Units Table 20 Compressor Loading and Unloading Sequences (cont) TROUBLESHOOTING Checking Display Codes To view the digital dis- Complete Unit Stoppage If the unit is off, there are Single Circuit Stoppage If a single circuit stops, Restart Procedure Before attempting to restart the Diagnostic Codes Diagnostic codes are warnings of Page Page Thermistor Troubleshooting The VAV con trol Electronic Controls Checkout The following will Page Page Page Enthalpy Sensor Checkout To test operation of Economizer Motor All control of the motor (i.e., Supply Fan Variable Frequency Drive Page Table 30 Carrier Default Program Parameter Values (Supply Fan VFD) Power Exhaust Variable Frequency Drive (48FM and 50FM,FS) Fig. 56 Variable Frequency Drive Terminal Block Unit Wiring A typical wiring schematic is shown in LEGEND AND NOTES FOR FIG. 57 Page Page Page SERVICE TRAINING START-UP CHECKLIST I. PRE-START-UP: II. PRELIMINARY CHECKLIST ITEMS: III. START-UP IV. NOTES