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On units equipped with optional supply fan and/or exhaust fan
VFDs, the fan speed is controlled by a 3-phase VFD. The supply
fan VFD is located in the supply fan section (030-050 size units)
or mixing box section (055-100 size units) behind an access door.
For 030-070 size units with optional power exhaust or return fan,
the motor VFD would be located next to the supply fan VFD. For
075-100 size units with optional high-capacity power exhaust or
return fan, the exhaust fan VFD is located in the mixing box sec-
tion behind an access door.
The P Series units use ABB VFDs. The VFDs communicate to the
ComfortLink MBB over the local equipment network (LEN). The
VFD speed is controlled directly by the ComfortLink controls
over the LEN. The interface wiring for the VFDs is shown in Fig.
A and the terminal designations are shown in Table AA. The VFD
has a keypad display panel that can be used for Service Diagnos-
tics and setting the initial VFD parameters required to allow the
VFD to communicate on the LEN. Additional VFD parameters
are set by the ComfortLink 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 ComfortLink controls
(Alarms
R.CUR =Yes).
TERMINAL
U1 / L1
V1 / L2
W1 / L3
U2 / T1/U
V2 / T2/V
W2 / T3/W
X1-11 (GND)
X1-12 (D-COM)
X1-10 (+24 V)
X1-13 (DI-1)
X1-10 (+24 V)
X1-16 (DI-4)
X1-28 (SCR)
X1-29 (B+)
X1-30 (B-)
X1-31 (AGND)
X1-32 (SCR)
10
11
APPENDIX D — VFD INFORMATION
Table AA — VFD Terminal Designations
Three-phase main circuit input power supply
Three-Phase AC Output to Motor,
0-v to Maximum Input Voltage Level
Factory-supplied jumper
Factory-supplied jumper
Start Enable 1 (Factory-supplied jumper).
When opened the drive goes to emergency stop.
Factory wired for local equipment network LEN communication
12
13
14
15
Fig. A — VFD Wiring
Table AB outlines the VFD parameters required to initialize com-
munication over the ComfortLink 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 param-
eters must be set at the initial power up of the drive. This can be
accomplished by setting each of the parameters individually. See
Table AB.
After the parameters in Table AB have been set, the ComfortLink
controls configure the additional parameters listed in Tables AC
and AD automatically. These parameter configurations are sent to
the VFD at every power up. The parameters listed in Table AC
have corresponding ComfortLink configurations (Configura-
tion
S.VFD and Configuration
Table AD are hard-coded to be set as listed.
After configuration Tables AC and AD have been sent to the
VFD, the drive continues to send and receive information from the
ComfortLink controls. This information is outlined in Tables AE
and AF. Table AE lists the information the VFD sends to the
ComfortLink controls, and Table AF lists the information the
ComfortLink controls send to the VFD. These tables are updated
at every scan the ComfortLink controls perform of the LEN. This
occurs approximately once every second.
FUNCTION
Terminal X1
16
17
18
LEN connection from ComfortLink
221
E.VFD). The parameters in
28
29
30
31
32
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Troubleshooting
