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Operation Adjustments
• Air supply pressure must be a minimum of 70 psig (4.8 bar/
480 kPa) and a maximum of 100 psig (6.9 bar/690 kPa).
Excessive air pressure may damage the balancer or controls.
• Prior to adjustment of the controls, ensure air is off and wire
rope is slack.
• Interlock should not be adjusted until all control adjustments
have been completed. Interlock may not function properly if it
is set before the controls.
• Screw type flow control and hook balance adjustment screws
on the ZA manifold should never extend above manifold body.
Thread engagement will be minimal and could result in screw
being discharged from manifold.
• The 2PS control may not support the weight of the empty
handling device, or may raise device at a potentially hazardous
rate. Extreme care must be used until all control adjustments
are complete.
ZA Control
1.
On top of the ZA manifold are two screw type flow controls.
Turn "UP" and "DOWN" flow control screws clockwise until
fully closed. Then turn each flow control screw
counterclockwise one full turn.
2.
The center screw is for hook balance adjustment. Screw head
should be flush with top of manifold body.
3.
Turn on air supply. Adjust supply pressure; do not exceed 100
psig (6.9 bar/690 kPa).
4.
Raise load to "UP" stop.
5.
Depress "DOWN" lever on ZA control pendant. Adjust
"DOWN" flow control screw, by turning counterclockwise,
until desired down speed is reached.
6.
Depress "UP" lever on ZA control pendant. Adjust "UP"
flow control screw, by turning counterclockwise, until
desired speed is achieved.
7.
To set hook balance point, adjust hook balance adjustment
screw, by turning clockwise, until empty handling device
begins to rise. Slowly adjust screw, by turning
counterclockwise, until handling device stops moving.
2PS Control
1.
Set pilot regulator screw with 1/2 inch (12 mm) of thread
visible.
2.
On the left side of the regulator (farthest from the balancer as
the control is installed) locate trim valve screw and adjust, by
turning clockwise, until closed. Turn screw counterclockwise
one and a half turns.
3.
Locate auxiliary flow control (closest to the balancer as the
control is installed) screw and adjust, by turning screw
counterclockwise, until screw head protrudes from regulator
body 1/8 inch (3 mm).
4.
Adjust 2PS bleed valve screw, by turning clockwise, until
closed, then turn counterclockwise two turns.
MHD56162 – Edition 1
REVIEW COPY 9-7-99
5.
Turn on air supply to system. Adjust supply pressure to 70
psig (4.8 bar/480 kPa) minimum, but do not exceed 100 psig
(6.9 bar/690 kPa).
6.
Turn on air supply to handling device.
7.
Engage part with handling device.
8.
Adjust pilot regulator to balance (support) handling device
and part. Adjust pilot regulator screw, by turning clockwise,
to increase balancing capacity. Turn screw counterclockwise
to reduce balancing capacity. When balanced, equal effort
will be required to raise and lower the handling device and
part together.
9.
Disengage part at place point.
10. Adjust bleed valve screw at 2PS valve to balance empty
handling device. Turn bleed valve screw clockwise to
increase balancing capacity. Turn bleed valve screw
counterclockwise to decrease balancing capacity. When
empty handling device is properly balanced, it will require
equal effort to raise and lower.
Interlock (Safety Circuit)
• Interlock should not be adjusted until all control adjustments
have been completed.
• It may be necessary to actuate clamp/unclamp or vacuum/
blowoff button several times to obtain correct interlock
setting.
• Interlock is available only on ZA controlled handling devices.
1.
With the empty handling device suspended by the balancer,
adjust interlock adjustment screw, by turning
counterclockwise, until 3/4 inch (38 mm) of thread is visible.
2.
While cycling clamp/unclamp or vacuum/blowoff functions,
turn interlock adjustment screw clockwise until both clamp/
unclamp or vacuum/blowoff circuits function.
3.
Cycle clamp/unclamp or vacuum/blowoff buttons several
times to ensure smooth operation and that interlock valve is
shifting completely.
4.
Raise empty handling device to its "UP" stop. Depress "UP"
lever for 3 to 4 seconds to simulate a load on the balancer.
5.
Actuate clamp/unclamp or vacuum/blowoff circuits. Clamp/
blowoff should not function. Air may be heard discharging to
atmosphere.
6.
If clamp/blowoff does function, repeat this adjustment
procedure until clamp/blowoff does not open with handling
device at the "UP" stop.
7.
Once interlock valve is adjusted correctly, hold interlock
stem with a suitable pair of pliers and tighten the 3/8 inch jam
nut on interlock adjustment screw to prevent setting from
changing.
9
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