Siemens LMV5 Quick Start Manual page 35
Hide thumbs
Also See for LMV5:
- Technical instructions (374 pages) ,
- Basic documentation (278 pages) ,
- Manual (39 pages)
Advertisement
CANBus
The CANBus is a data bus not unlike a computer network. This data bus is used to connect
actuators, the AZL5, and the PLL52 Module to the LMV5 base unit. Special shielded cable is
used to connect all devices on the CANBus to the LMV5 base unit. This cable carries five
wires, and a braided shield that is located underneath the plastic cable sheathing.
The two heavier gauge wires (16 AWG) are used for power transmission to the connected
devices. These power wires are labeled 12VAC1 and 12VAC2, and carry 12 VAC each. These
wires are powered by Pin 1 and Pin 4 of the AGG5.210 transformer's 4-pin plug, and are fused
using fuse FU2 and FU3. These fuses are located under black covers on the right hand side of
the LMV5. If measured, 12VAC1 and 12VAC2 should have a potential of approximately 12 VAC
to reference ground and 24 VAC between 12VAC1 and 12VAC2.
The two lighter gauge (24 AWG) wires carry the digital data signal and are labeled CANL and
CANH. The signal on these wires consists of 5 volt DC pulses.
Note: These data wires should never contact the 12VAC wires when the system is powered.
LMV5 damage can result.
The termination resistor, which is located on each actuator and the PLL5 module is used to
terminate CANH and CANL and should be moved to the bus termination position on the last
CANBus device.
The last wire in cable is the reference ground and is marked GND. This is also connected to
each device on the CANBus so that the LMV5 can monitor for voltage drops that might affect
actuator operation.
Note:
It is extremely important that the shield of the CANBus cable
is properly terminated.
The shield of the CANBus cable is terminated to the LMV5 by using a special strain relief, part
number AGG5.110.
This strain relief also has a wire that should be connected to the shield terminal on the LMV5.
The installation of this clip as well as clip for the AZL5 cable is shown in Figure 3-1.3.
Figure 3-1.3 Installation of CANBus Strain Relief's
LMV5 QSG Rev 4
Sec 3
Pg 3
www.scccombustion.com
Advertisement
