19
• For ACH550/580 VFDs the voltage is sourced from the
VFD at its terminal 10 (+24 V). SAV speed inputs are re-
ceived at terminals 14 (DI-2) for low speed (40 Hz) motor
operation and 15 (DI-3) for high speed (60 Hz) motor op-
eration. See Table 13 and Fig. 30 (on page 20).
When neither input is present, the VFD will shut the fan motor
off. There is no separate indoor fan contactor required in this
application.
The VFD used in the SAV™ system has soft start capabilities
to slowly ramp up the speeds, eliminating any high inrush of
air volume during speed changes. It also has internal over cur-
rent protection for the fan motor.
INDOOR FAN MOTOR
The indoor fan motors used with the VFD are specially manufac-
tured for use with VFD power circuits. The motor winding insula-
tion is specially formulated to resist breakdown due to voltage
stress issues. The motor shaft includes grounding rings to prevent
damage to bearings caused by grounding currents. Replace these
motors with Factory Authorized Parts available from Replace-
ment Components Division (RCD).
Fig. 28 — Connection Schematic - Fan Speed Relay Board and VFD
N/A 1
J2
24vdc6
J2
2
3
Lo Spd
Hi Spd
K1 K2
K2
K3 K4 JMP2
K3
K1
K1
K2
K3
K4
W1
C
Y2
HUMID
G
2
1
J1
3
4
5
4 & 5
JMP1
COM
ACS320 VFD TERMINAL
YEL
WHT
109
11
12 13 14
15
N/A 1
J2
24vdc6
J2
2
3
Lo Spd
Hi Spd
K1 K2
K2
K3 K4 JMP2
K3
K1
K1
K2
K3
K4
W1
C
Y2
HUMID
G
2
1
J1
3
4
5
4 & 5
JMP1
COM
ACH550/ACH580 VFD TERMINAL
YEL
WHT
11
10
12
13
14
15
16
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