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5
Supply Fan (Direct--Drive)
For unit sizes 04, 05 and 06, a direct--drive
forward--curved centrifugal blower wheel is an available
option. The motor has taps to provide the servicer with the
selection of one of five motor torque/speed ranges to best
match wheel performance with attached duct system. See
Fig. 5 and Fig. 6 .
ECM Motor
Motor Plug Position
(95° from vertical)
95°
ECM Power
Transformer
(460, 575v)
C09260
Fig. 5 -- Direct--Drive Supply Fan Assembly
ECM Motor —
The direct--drive motor is an X13
Electronically Commutated Motor (ECM). An ECM
motor contains electronic circuitry used to convert
single--phase line AC voltage into 3--phase DC voltage to
power the motor circuit. The motor circuit is a DC
brushless design with a permanent magnet rotor. On the
X13 ECM Motor design, the electronic circuitry is
integral to the motor assembly and cannot be serviced or
replaced separately.
208/230V units use a 230V motor. 460V units use a 230V
motor with a stepdown transformer (mounted on the end
of the fan housing, see Fig. 5). 575V units use a 460V
motor with an autotransformer. Motor power voltage is
connected to motor terminals L and N (see Fig. 6 and
Fig. 7); ground is connected at terminal G. The motor
power voltage is ALWAYS present; it is not switched off
by a motor contactor.
L2
YEL
Gnd
GRN/YEL
L1
BLU
C
1 2 3 4 5
L G N
Motor
Power
Connections
Speed
Taps
Com
BRN
VIO
Default Connection
C09261
Fig. 6 -- ECM Motor Connectors
Evaluating motor speed —
The X13 ECM Motor uses a
constant torque motor design. The motor speed is adjusted
by the motor control circuitry to maintain the programmed
shaft torque. Consequently there is no specific speed value
assigned to each control tap setting. At the Position 5 tap,
the motor speed is approximately 1050 RPM (17.5 r/s) but
varies depending on fan wheel loading.
Selecting speed tap —
The five communication terminals
are each programmed to provide a different motor torque
output. See Table 1. Factory default tap selection is
Position 1 for lowest torque/speed operation.
Table 1 – Motor Tap Programing
(percent of full--load torque)
Unit Size
Tap 1
Tap 2
Tap 3
Tap 4
Tap 5
04
32
38
45
50
100
05
46
58
61
69
100
06
73
82
85
90
100
Factory Default: Tap 1 (VIO)
Selecting another speed:
1. Disconnect main power to the unit. Apply
lockout/tagout procedures.
2. Remove the default motor signal lead (VIO) from
terminal 1 at the motor communications terminal.
3. Reconnect the motor signal lead to the desired speed
(terminals 1 through 5).
4. Connect main power to the unit.
48H
C
Summary of Contents for 48HC*04-14
Page 94: ...94 APPENDIX IV WIRING DIAGRAMS C14007 Fig 80 48HC A04 A06 YAC Power Diagram 230 1 60 48HC ...
Page 96: ...96 APPENDIX IV WIRING DIAGRAMS C14013 Fig 82 48HC A04 A06 YAC Power Diagram 575 3 60 48HC ...
Page 97: ...97 APPENDIX IV WIRING DIAGRAMS C14018 48HC ...
Page 98: ...98 APPENDIX IV WIRING DIAGRAMS C14019 48HC ...
Page 99: ...99 APPENDIX IV WIRING DIAGRAMS C13484 Fig 83 48HC D08 D09 YAC Power Diagram 230 460 3 60 48HC ...
Page 100: ...100 APPENDIX IV WIRING DIAGRAMS C14024 Fig 84 48HC D08 D09 YAC Power Diagram 575 3 60 48HC ...
Page 101: ...101 APPENDIX IV WIRING DIAGRAMS C14027 Fig 85 48HC D12 YAC Power Diagram 230 460 3 60 48HC ...
Page 102: ...102 APPENDIX IV WIRING DIAGRAMS C14029 Fig 86 48HC D12 YAC Power Diagram 575 3 60 48HC ...
Page 104: ...104 APPENDIX IV WIRING DIAGRAMS C14032 Fig 88 48HC D14 YAC Power Diagram 230 460 3 60 48HC ...
Page 105: ...105 APPENDIX IV WIRING DIAGRAMS C12462 Fig 89 48HC D14 YAC Power Diagram 575 3 60 48HC ...
Page 123: ...123 APPENDIX IV WIRING DIAGRAMS C12690 Fig 107 PremierLink System Control Wiring Diagram 48HC ...
Page 125: ...125 APPENDIX IV WIRING DIAGRAMS C14034 Fig 109 RTU Open Wiring Diagram 48HC ...