7.0
INSTALLATION
IRN37–160K–OF & IRN50–200H–OF
http://air.irco.com
22
CAUTION
VERY IMPORTANT
Supply voltage must be kept to a maximum imbalance of 2% on 50Hz and 3% on 60Hz applications. Voltage
imbalances greater than these levels can cause permanent damage to the drive.
Compressor must not be subjected to any voltage spikes or surges in excess of 575V. Exposure to spikes/surges in
excess of 575V can permanently damage the drive. If the possibility of such exists it is recommended that adequate
surge protection is fitted such as an Ingersoll–Rand line reactor. See your local Ingersoll–Rand representative.
Failure of the drive due to voltage spikes, line notching, harmonics or other power quality related problems, will not
be covered by the standard compressor warranty.
The correct type and rating of line input fuse MUST BE fitted onto the customers isolator or breaker close to the
compressor. For Amp rating see technical information in Section 8.1.
CAUTION
This procedure should only be carried out by a qualified electrician, electrical contractor or your local
Ingersoll–Rand Distributor or Air Centre.
The compressor installation must be properly installed in accordance with recognized Local and National
electrical equipment installation codes and any other related local Health and Safety Codes.
The compressor input power supply (branch circuit) protection shall be made by utilizing an Isolator switch (Disconnect
switch). The input power supply branch circuit
shall only be protected using “FAST ACTING (FAST BLOWING)”
fuses
as defined below, and NOT using “Time Delay” (slow acting or dual element type) fuses.
Fuse Type
1,2
Fuse Selection Criteria
3
Class – J, Class – T, or Semiconductor fuses
Fuse size
150% Total Package Amps
4
Fuse size
175% Total Package Amps
4
Note:
Note:
1. Fuse must be Fast acting, current limiting with
interrupt rating of 200,000 amps RMS SYM
3. This is only a recommendation and installer must
follow local and/or national codes prior to
installation
2. Alternate fuse type may be used if the time vs. current
characteristics are faster then fuse types
recommended
4. Total package current (amps) can be obtained
from IR Sales Library
(Engineering data sheets)
for any pre–install inquiries, and from actual
Compressor Nameplate
(contact your local IR
Distributor for more information)
CIRCUIT BREAKERS are NOT recommended
for branch circuit protection, due to their slow response, resulting into
inadequate protection in event of a fault.
Example of voltage imbalance calculation
U
→
V
462v
V
→
W
459v
W
→
U
453v
V(m) = (462 + 459 + 453) / 3 = 458v
V
∆
max = 462 – 453 = 9v
\
= (9 / 458) x 100 = 1.97%