Nexen BD 933507 - Manual (Page 12)

12 FORM NO. L-20063-AD-0314
NORMAL AIR ENGAGED MODE
Below is a standard air brake control circuit. On-off air control
is accomplished by the three-way valve. Torque is controlled
by the regulation of air pressure (See Figure 10).
NORMAL SPRING ENGAGED MODE
This mode is for occasional duty, non-cyclic applications
only. A hold-off air pressure of 5.17-6.90 bar [75-100 psi]
is used to compress the spring inside the actuator canister.
A control signal is used to release hold-off air pressure,
thus applying full spring engaged torque to the disc (See
Figure 11).
OPERATIONAL MODES
Lubricator
3-Way Valve N.C.
Quick
Exhaust
Valve
Power
Source
Regulator
Filter
Air Supply
3-Way Manual
Valve
Connected to
Spring Engaged
Port
Figure 11
Air-Engaged Port
Service Service
Plug
Spring-Engaged Port
o
BSolete
t
hree
-P
ort
a
ctuator
Spring Brake
Service
t
wo
-P
ort
a
ctuator
Spring Brake
Air-Engaged Port Spring-Engaged Port
CAUTION
Do not plug both Service Ports.
Install a breather (such as a
muffler) to one of these two ports.
CAUTION
Do not plug Service Port. Install
a breather (such as a muffler) to
the port.
Filter
Regulator
Lubricator
Air Supply
Power
Source
3-Way Valve
N.C.
Quick Exhaust
Valve
3-Way Manual
Valve
Figure 10