Reliance electric MinPak Plus, Instruction Manual

Page: 11 / 55

10
bottom and side. This unobstructed area allows for
proper air circulation through the heat sink. Do not
place the controller directly in a corner. Leave at least 8
inches (200 mm) from the top or 6 inches (150 mm) from
the bottom of the enclosure. (Refer to Figure 3.1.)
Guideline 3 - Since the controller's Cover is hinged,
additional clearance must be provided on the fourth
side of the Chassis. (Refer to Figure 3.1.)
Guideline 4 -If mounting the controller within a larger
enclosure, do not place it directly in a corner. Leave at
least 8 inches (200 mm) from the top or 6 inches
(150mm) from the bottom of the enclosure. Also leave
8 inches (200 mm) between the enclosure side wall and
the unhinged side of the controller. (Refer to Figure 3.2.)
Heat builds up at the cabinet's top and may exceed the
permissible inside ambient temperature upper limit. At
the cabinet's bottom, the unit must be high enough to
allow air to flow upwards.
Figure 3.2 - Enclosure Mounting Minimum Distances
Guideline 5 -Regardless of the above placement
guidelines, the user is responsible for providing ambiĆ
ent temperatures that meet the controller's specificaĆ
tions. For units mounted on an open panel or wall this
range is 0
°
Ć 40
°
C (32
°
Ć104
°
F).
Guideline 6 -Conduit knockouts ar provided on top
and bottom of this cabinet. Plan controller placement on
the wall or panel to allow for conduit runs. Proper care
should be taken when installing conduit to maintain
NEMA 12 type rating.
Guideline 7 -If the controller is placed in a larger encloĆ
sure, do not place it so that the Cover, if used, cannot
swing open at least 90
°
minimum. Allowing for a full
110
°
swing aids subsequent installation and trouble
shooting. (Note that the Cover will swing open to the
left).
Guideline 8 - Do not route the tachometer feedback
signal cable, if used, with aĆc or dĆc control or power wirĆ
ing. Also use the specified wire for this function.
Guideline 9 -The controller requires a threeĆphase
power supply that provides either 230 VAC or 460 VAC
at 50/60 Hz. If correct voltage is not available, it will be
necessary to install a transformer between the power
supply and the controller.
WARNING
DO NOT OPERATE THE MINPAK PLUS CONĆ
TROLLER ON POWER SUPPLIES WITH AVAILĆ
ABLE SHORTĆCIRCUIT CURRENTS IN EXCESS
OF 5000 AMPERES. DAMAGE TO EQUIPMENT
AND PERSONAL INJURY MAY OCCUR.
Guideline 10 - Although autoĆtransformers may step
up and step down aĆc power supply voltage, they do
not isolate the driven system from the aĆc line. Users
should consider using an isolation transformer if the apĆ
plication conditions warrant it.
If an isolation or autoĆtransformer is used ahead of the
controller, the disconnect switch should be placed on
the aĆc power line between the power source and the
transformer primary. Again, use a f used disconnect
switch. (Do not use a circuit breaker type switch beĆ
cause of the high inrush of transformer equipment.).
An isolation transformer is not necessary unless the apĆ
plication conditions require one. However, its use proĆ
vides distinct advantages. With an isolation transformĆ
er:
Personal injury is guarded against should accidental
contact be made with an electrical conductor from
the drive.
AĆc power line disturbances, or transients, are
minimized by an isolation transformer, thereby reĆ
ducing or eliminating damage to other solidĆstate
equipment powerĆconversion components in the
controller and other userĆequipment on the same ac
line.
The transformer provides electrical isolation beĆ
tween the aĆc power lines and the drive motor.
Damaging currents may be eliminated in instances
where a dĆc output accidentally becomes grounded
in a unit where the aĆc electrical system is grounded.
For detailed information, refer to Paragraph 3.4.
Guideline 11 - The National Electrical Code requires
that a threeĆpole, fused disconnect switch be installed
on the incoming aĆc line ahead of the controller to proĆ
vide branch circuit protection. The fuse should be Class
K5.
It is recommended that the disconnect switch be placed
within easy reach of operating and maintenance perĆ
sonnel. Do not place it inside a surrounding enclosure
since cabinet doors may be locked. (Consult your local
codes.)
Note that the standard POWERON/OFF circuit breaker
is a threeĆpole circuit breaker designed only to provide