Table of Contents
Advertisement
•
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
J2
6
24vdc
J1
1
2
W1
3
Y2
4
HUMID
5
J2
6
24vdc
J1
1
2
W1
3
Y2
4
HUMID
5
Fig. 28 — Connection Schematic - Fan Speed Relay Board and VFD
K1
K2
K2
K1
C
G
K1
K2
K2
K1
C
G
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).
N/A
K3
K4
JMP2
Lo Spd
K3
Hi Spd
COM
K1
K2
K3
K4
ACH550/ACH580 VFD TERMINAL
N/A
K3
K4
JMP2
Lo Spd
K3
Hi Spd
COM
K1
K2
K3
K4
19
ACS320 VFD TERMINAL
9
10
11
12
13
14
15
J2
1
YEL
2
WHT
3
4 & 5
JMP1
10
11
12
13
14
15
16
J2
1
YEL
2
WHT
3
4 & 5
JMP1
Advertisement
Table of Contents
