VFD68 Variable Frequency Drive (575 VAC) Installation Instructions
12
-
Install a ferrite core on the signal cable (for example, ZCAT3035-1330 TDK).
Terminal Screw Torque Specifications
Tighten the terminal screw to the specified torque. Over-tightening the terminal screws may damage the terminal
blocks and screw threads. Loose terminal screw connections can result in a short circuit or malfunction
Branch Circuit Protection
Integral solid-state short circuit protection does not provide branch circuit protection. The installer must provide
branch circuit protection in accordance with the National Electrical Code for the U.S. or the Canadian Electrical
Code for Canada and any additional codes.
As specified, UL Class T fuses or any faster acting fuse with the appropriate rating or Listed UL 489 Molded Case
Circuit Breaker (MCCB) must be employed in accordance with the following table.
Short Circuit Ratings
The VFD68 Drives meet the requirements for their respective rating categories (Table 8).
High-Voltage Wire Size and Maximum Wire Length
Use UL Listed copper, stranded wire with insulation rated at 75°C (167°F) for wiring the high-voltage supply to the
drive (R/L1, S/L2, T/L3) and wiring the high-voltage drive output (U, V, W) to the motor.
Selecting the Correct VFD68 Drive for a Fan Motor
1.
Determine the maximum current consumption from the motor ratings label.
2.
Use Table 9 to find the maximum output current that just exceeds the motor’s maximum current consumption
and use the VFD68 part number associated with this maximum output current as the recommended drive for
the motor.
Table 6: Torque Specifications for VFD68Dxx Drives
Rated Capacity, kW (HP)
Terminal Screw Size
1
1.
The terminal screw size indicates the terminal size for R/L1, S/L2, T/L3, U, V, W, PR, +, -, P1 and a screw for earthing
(grounding).
Tightening Torque, N•m (lb•in.)
0.75
–
7.5 (1
–
10)
M4
1 (8.85)
Table 7: VFD68Dxx Drives Electrical Ratings
VFD68 575 VAC
kW (HP)
0.75 (1)
1.5 (2)
2.2 (3)
3.7 (5)
5.5 (7.5)
7.5 (10)
Rated fuse voltage (V)
575 V or more
Fuse Maximum allowable rating (A)
(without power factor improving reactor)
1
1.
Maximum allowable rating by US National Electrical Code. Exact size must be chosen for each installation.
6 A
10 A
15 A
20 A
30 A
40 A
Molded case circuit breaker (MCCB)
Maximum allowable rating (A)
5 A
10 A
15 A
20 A
30 A
30 A
Table 8: VFD68 Drives Short Circuit Ratings
Rating Category
Suitable for use in a circuit capable of delivering not more than
VFD68Dxx Drives (575 VAC Class)
100 kA rms symmetrical amperes, 600 V maximum
IMPORTANT:
Use copper conductors only. Make all wiring in accordance with local, national, and
regional regulations.
