Honeywell
• 23
P
OWER
CABLING
4.1.1.2
Cable and fuse sizes, frames MR7 to MR9, North America
The recommended fuse types are gG/gL (IEC 60269-1) or class T (UL & CSA). The fuse volt-
age rating should be selected according to the supply network. The final selection should be
made according to local regulations, cable installation conditions and cable specification. Big-
ger fuses than what is recommended below shall not be used.
Check that the fuse operating time is less than 0.4 seconds. Operating time depends on used
fuse type and impedance of the supply circuit. Consult the factory about faster fuses. Honey-
well offers recommendations also for high speed J (UL & CSA ), aR (UL recognized, IEC
60269-4) and gS (IEC 60269-4) fuse ranges.
Table 9. Cable and fuse sizes for Honeywell Smart VFD HVAC (MR7 to MR9)
The cable dimensioning is based on the criteria of the Underwriters’ Laboratories UL508C:Cables must
be PVC-isolated; Max ambient tempe86°F, max temperature of cable s158°F; Use only
cables with concentric copper shield; Max number of parallel cables is 9.
When using cables in parallel,
NOTE HOWEVER
that the requirements of both the cross-sectional
area and the max number of cables must be observed.
For important information on the requirements of the grounding conductor, see standard Underwriters’
Laboratories UL508C.
For the correction factors for each temperature, see the instructions of standard Underwriters’ Labora-
tories UL508C.
4.2
Brake resistor cables
The SmartVFD HVAC is equipped with terminals for an optional external brake resistor. These
terminals are marked with R+ and R- (MR4-MR6) or DC+/R+ and R- (MR7 and bigger).
4.3
Control cables
For information on control cables see chapter Control unit cabling.
Frame
Type
I
L
[A]
Fuse
(class T)
[A]
Mains, motor
and ground
cable
Cu
Terminal cable size
Main terminal
Ground terminal
MR7
C 0500
72,0
100
AWG2
AWG9-AWG2/0
AWG9-AWG2/0
C 0600
87,0
110
AWG1
AWG9-AWG2/0
AWG9-AWG2/0
C 0750
105,0
150
AWG1/0
AWG9-AWG2/0
AWG9-AWG2/0
MR8
C 1000
140,0
200
AWG3/0
AWG1-350 kcmil AWG1-350 kcmil
C 1250
170,0
225
250 kcmil
AWG1-350 kcmil AWG1-350 kcmil
C 1500
205,0
250
350 kcmil
AWG1-350 kcmil AWG1-350 kcmil
MR9
C 2000
261,0
350
2*250 kcmil
AWG1-350 kcmil AWG1-350 kcmil
C 2500
310,0
400
2*350 kcmil
AWG1-350 kcmil AWG1-350 kcmil
Summary of Contents for SmartVFD HVAC MR4
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