Minster IOI, Руководство по обслуживанию

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4. A jammed meter block piston will not allow oil to flow
freely from test port when pump is running. Remove
the defective distributor block assembly and place
on a clean work location.
5. Loosen and remove hex cylinder end plugs (B) at
opposite ends of the jammed piston (C). Try to
move the piston back and forth with finger pressure,
but DO NOT REMOVE PISTON. Piston should be
tight but not immovable.
If unable to loosen from either end, permanent damage
has occurred and the section must be replaced.
Flow Switch
Flow of oil through the switch displaces the piston with
its enclosed permanent magnet. The magnet in turn,
actuates the hermetically sealed switch which permits
the press clutch electrical control system to function.
As long as a sufficient flow of oil passes through the
flow switch, the press clutch may be engaged in the
normal manner. However, if oil is stopped, as explained
in the section on meter units, or if flow is severely dimin-
ished because of a plugged filter or lack of oil in the
reservoir, the flow switch will open, disengaging the
press clutch. A LUBE FAULT lamp is included in the cir-
cuitry to signal a lubrication system malfunction.
CAUTION
MAINTENANCE PERSONNEL SHOULD ALWAYS
MAKE CERTAIN THAT POWER IS DISCONNECTED
WHENEVER LEADS ARE REMOVED FROM THE
FLOW SWITCH. GROUNDING ANY OF THE STATIC
SWITCH TERMINALS, WITH POWER APPLIED,
WILL USUALLY DESTROY THE DEVICE.
To Check The Flow Switch:
To check flow switch for proper operation, perform the
following test:
1. Turn OFF power to press.
2. Disconnect the two (2) flow switch leads from the
press electrical system. These connections are
usually made inside an adjacent conduit box.
3. Disconnect lube lines from flow switch and remove
flow switch from the press.
4. Attach the two (2) flow switch leads to a continuity
meter. Then, working through the input port, push
the piston up through its normal range of travel.
(See Figure 5D.)
Results: With piston lifted, switch should indicate
closed. Then allow piston to drop to its
normal position and switch should remain
open. If switch does not open and close
as indicated, replace the flow switch.
Minster Static Switch
Whenever the lube system flow switch is used to con-
trol inductive loads or high current circuits, the Minster
Bul. 491-0011 static switch is furnished. This is a solid
state A.C. switching unit which is completely encapsu-
lated and sealed. Size is comparable to a small terminal
block. Use of the static switch permits control of loads
up to 500 watts at 120 V.A.C. from the flow switch. Its
completely electrical operation provides the additional
reliability of no moving parts. Three binding posts are
provided for quick electrical connection. They are iden-
tified as terminals “A2”, “G” and “A1”. A typical wiring
schematic for this device is shown in Figure 6D.
D - 7
Housing
Spring
Piston
Permanent Magnet
Output
Hermetically
Sealed Switch
Input
Figure 5D. Flow switch.
Flow Switch
110
V.A.C.
A2 G A1
MINSTER
STATIC SWITCH
LOAD
Figure 6D. Static switch.
!