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230
APPENDIX D
—
VFD INFORMATION
On units equipped with optional supply fan and/or exhaust fan
VFDs, the fan speed is controlled by a 3-phase VFD. The sup
-
ply fan VFD is located in the supply fan section behind an ac
-
cess door. The exhaust fan VFD is located on the back wall of
the unit return section.
The N Series units use ABB VFDs. The VFDs communicate to
the
Comfort
Link MBB over the local equipment network
(LEN). The VFD speed is controlled directly by the
Com
-
fort
Link controls over the LEN. The interface wiring for the
VFDs is shown in Fig. A and the terminal designations are
shown in Table A. The VFD has a keypad display panel that
can be used for Service Diagnostics and setting the initial VFD
parameters required to allow the VFD to communicate on the
LEN. Additional VFD parameters are set by the
Comfort
Link
controls and sent to the VFD over the LEN at power up of the
VFD. The VFD faults can be reset with the VFD keypad or
through the
Comfort
Link controls (
Alarms
R.CUR
=Yes).
Table B outlines the VFD parameters required to initialize
communication over the
Comfort
Link LEN. These parameters
must be set correctly for any communications to occur. These
parameters come preset from the factory. If the VFD is
replaced, these parameters must be set at the initial power up of
the drive. This can be accomplished by running the Carrier As
-
sistant through the VFD keypad (see START-UP WITH THE
CARRIER ASSISTANT section) or setting each of the param
-
eters individually.
After the parameters in Table B have been set, the
Comfort
Link
controls configure the additional parameters listed in Tables C
and D automatically. These parameter configurations are sent
to the VFD at every power up. The parameters listed in Table C
have corresponding
Comfort
Link configurations (
Configura
-
tion
IAQ
S.VFD
and
Configuration
IAQ
E.VFD
). The
parameters in Table D are hard-coded to be set as listed.
After configuration Tables C and D have been sent to the VFD,
the drive continues to send and receive information from the
Comfort
Link controls. This information is outlined in Tables E
and F. Table E lists the information the VFD sends to the
Com
-
fort
Link controls, and Table F lists the information the
Com
-
fort
Link controls send to the VFD. These tables are updated at
every scan the
Comfort
Link controls perform of the LEN. This
occurs approximately once every second.
Fig. A VFD Wiring
Table A — VFD Terminal Designations
TERMINAL
FUNCTION
U1
3-Phase Main Circuit Input Power Supply
V1
W1
U2
3-Phase AC Output to Motor, 0 V to Maximum Input Voltage Level
V2
W2
X1-11 (GND)
Factory-supplied jumper
X1-12 (D-COM)
X1-10 (+24 V)
Factory-supplied jumper
X1-13 (DI-1)
X1-10 (+24 V)
Start Enable 1 (Factory-supplied jumper). When opened the drive goes to emergency stop.
X1-16 (DI-4)
X1-28 (SCR)
Factory wired for local equipment network LEN communication
X1-29 (B+)
X1-30 (B-)
X1-31 (AGND)
X1-32 (SCR)
+2
4
V
GND
DCOM
DI-1
DI-2
DI-3
DI-4
DI-5
DI-6
SCR
B(+)
A(-)
AGND
SCR
10
11
12
13
14
15
16
17
18
28
29
30
31
32
LEN connection from
Comfort
Link
Terminal X1
Summary of Contents for WeatherExpert 48N2
Page 135: ...135 Fig 18 48 50N Typical Power Schematic Nominal 075 Ton Unit Shown ...
Page 136: ...136 Fig 19 48 50N Typical Power Schematic Nominal Ton 90 150 Units Shown ...
Page 137: ...137 Fig 20 48 50N Main Base Board Input Output Connections ...
Page 138: ...138 Fig 21 48 50N RXB EXB CEM Input Output Connections a48 9307 ...
Page 139: ...139 Fig 22 48 50N EXV SCB Input Output Connections a48 9308 ...
Page 140: ...140 Fig 23 48N Typical Modulating Gas Heat Unit Control Wiring ...
Page 141: ...141 Fig 24 50N Typical Electric Heat Unit Control Wiring ...
Page 144: ...144 Fig 27 48N Typical Gas Heat Section Wiring Nominal Ton 120 to 150 Units ...
Page 145: ...145 Fig 28 48 50N Typical Power Component Control Wiring 460 v ...
Page 146: ...146 Fig 29 48 50N Component Control Wiring 575 v Nominal Ton 075 to 150 Units ...
Page 147: ...147 Fig 30 48 50N Component Arrangement Power Box ...
Page 148: ...148 Fig 31 48 50N Component Arrangement Control Box ...
Page 240: ...240 APPENDIX D VFD INFORMATION CONT Fig G VFD Bypass Wiring Diagram WHEN USED ...