Nexen SPC 837400 - Manual (Page 9)

9 FORM NO. L-20095-U-1112
AIR CONNECTIONS
Note
Tighten the Ring Clamp Bolts to 33.7-47.3 Nm [25-35
ft-lb] torque.
A Hose Assembly (Item 35) is supplied and must be
connected to the brake with sufficient slack to allow the
arms full freedom of movement without putting undue stress
on the hose or hose connections.
Pneumatically actuated devices require clean, pressure
regulated, and lubricated air for maximum performance and
long life. Your Nexen Distributor carries filters, regulators,
and lubricators specifically designed to operate with Nexen
clutches, brakes, and valves.
Piping diagrams are included in this manual for a variety of
braking functions. Refer to OPERATIONAL MODES.
The Actuator air connections may be rotated 360 0 by
loosening the Ring Clamp and rotating the Actuator
Head.
CAUTION
Do not use rigid pipe or tubing when connecting
directly to the Brake. Care must also be taken
to prevent an unshielded air hose from rubbing
on metal surfaces or edges, as this will cause
rapid deterioration of the hose.
CAUTION
This product is spring loaded under
extreme pressure. Do not disassemble
actuator. If actuator malfunctions, replace
actuator or contact Nexen.
Note: The tap bolt beneath the actuator breather cap
can be used to physically release the spring.
OPERATIONAL MODES
NORMAL SERVICE MODE
Below is a standard air brake control circuit. On-off
air control is achieved by the 3-Way Valve. Torque is
accomplished by the regulation of air pressure.
NOTE: Maximum operating pressure is 6.9 bar [100
psi] (See Figure 9).
NORMAL SPRING ENGAGED MODE
This mode is for occasional duty, non-cyclic applications
only. A hold-off pressure of 5.2-6.9 bar [75-100 psi] is
used to compress the spring inside the Actuator canister.
A control signal is used to release the hold-off pressure,
thus applying full spring engaged torque to the brake (See
Figure 9).