Eaton Airflex HEVC 5005, Инструкция по установке, эксплуатации и обслуживанию

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EATON HEVC 5005 Installation, Operation and Maintenance Manual E-CLCL-CC002-E2 May 2017 12
HEVC 5005
2.8 Electrical controls
2.8.1 Contact Eaton Airflex engineering for electronic
controls suitable for grinding mill applications.
Standard controls provides run, inch and timed
inch features only. Timed inch creates a delay
between successive clutch engagements when
spotting the mill to prevent clutch overheating
and damage. Other control features, such as
clutch slip detection, can be provided. These
controls with the inclusion of an HMI, provide
slip detection an clutch disengagement based
on set parameters.
3.0 Operation
Warning
Exceeding the operating limits described in this
section may result in personal injury or
equipment damage.
3.1 Torque, RPM and pressure limits
3.1.1 The developed torque is directly proportional to
the applied air pressure. If the developed torque
seems inadequate, check for oil, grease or dust
contamination.
Caution
Maximum applied air pressure is 120 psig (8.3 bar).
Operation at pressures exceeding 120 psig may
result in damage to the clutch element. Airflex
grinding mill clutches typically require only 100 psig
(6.8 bar) operating pressure.
Caution
The sintered friction material used in Airflex VC
units may not develop rated torque initially, as a short
“Wear-in” period is required. It is very important that
the first few mill starts be monitored to prevent
excessive heat generation from slippage.
3.1.2 Maximum safe operating speeds are shown
on Table 4.
Danger
Do not exceed the operating speeds shown on
Table 4. Operation at speeds greater than allowable
will result in permanent damage to the clutch
element, personal injury or death.
3.2 Control component adjustment
The following section gives "typical" component
settings only. Since operating characteristics vary
from one grinding mill to the next, absolute values
cannot be given. The settings described below offer
a good “starting point" to achieve satisfactory mill
acceleration and motor overload - some "fine tuning”
will probably be required.
3.2.1 Set the pressure switch (5) located on the air receiver
tank to open at 90 psig (6.1 bar) falling. Use normally
open contacts and wire in series with the solenoid
valve coil (9). This pressure switch is used to
disengage the clutch if operating pressure falls below
90 psig (6.1 bar), or to prevent clutch engagement
if operating pressure is below 90 psig (6.1) bar.
3.2.2 Set the pressure switch (12) located in the air supply
line to the clutch to open at approximately 5 psig
(0.3 bar). Use normally closed contacts and wire
into the motor starter interlock circuit. The purpose
of this pressure switch is to prevent starting the
motor with the clutch engaged.
3.2.3 Set the pressure regulator (3) to 100 psig (6.8 bar).
This is the nominal starting air pressure for the mill.
3.2.4 With the motor "off", manually trip the solenoid valve
and note the time elapsed for the pressure gauge (7)
to register full tank pressure.
3.2.5 Repeat the above procedure while adjusting the
flow control valve (11) to supply a pressure rate of
approximately 20 psig/sec. (1.4 bar/sec.). Due to
the non-linearity of the pressure-time curve, it will be
easier to use a reduced value to set the flow control
valve. For example, if the tank pressure is 100 psig
(6.8 bar), to obtain a flow rate of 20 psig/sec.
(1.4 bar/sec.), time the pressure build up to 80 psig
(5.4 bar) and adjust the flow control valve to deliver
this pressure in 4 seconds, which, for all practical
purposes, would equate to the desired 20 psig/sec.
(1.4 bar/sec.).
Table 4
Maximum safe operating speeds
Size Maximum RPM
DW28HEVC1000 1100
DW51HEVC1600 550
DW60HEVC1600 520
DW66HEVC1600 480
DW76HEVC1600 416
DW76HEVC2000 275