LAB-EL LB-762, Руководство по установке

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LB-762 Controller Installation Manual LAB-EL
3.7 Outputs of analog servomotors
LB-762 regulator is equipped with 8 connectors used for connection of analog servomotors. The outputs permit control of
any servomotors which accept control signal within the range 0-10V or 2-10V. Apart from control of servomotor it is also
possible to connect return signal from servomotor, informing about the current position of the servomotor. Scope of voltages
of return signal is analogous to the control output: 0-10 or 2-10V. The return signal is used by the regulator to control
correct operation of the servomotor (check whether the servomotor is set in accordance with the preset control signal). If the
servomotor has no return signal output or is not used in the given installation, one should make the connection according to
Figure
3.9 .
Connectors of regulator LB-762 intended for cooperation with servomotors are marked as follows:
• ACTUATOR #1 - servomotor no. 1,
• ACTUATOR #2 - servomotor no. 2,
• ACTUATOR #3 - servomotor no. 3,
• ACTUATOR #4 - servomotor no. 4,
• ACTUATOR #5 - servomotor no. 5,
• ACTUATOR #6 - servomotor no. 6,
• ACTUATOR #7 - servomotor no. 7,
•
ACTUATOR #8
- servomotor no. 8.
3.7.1 Servomotor power supply
LB-762 regulator does not supply power to servomotors – servomotors require a separate source of power supply. The manner
of power supply depends on the type of servomotors. Popular BELIMO servomotors can be powered with voltage 24V AC
or 24V DC, Johnson Control servomotors require only 24V AC power supply.
For 24V AC power supply the so-called safety transformer can be used 230V/24V, one should however ensure proper anti-
shorting protection.
The power supply unit can be one common for all servomotors – it must however ensure appropriate current efficiency (one
should calculate the sum of input power by all servomotors and depending on this power accordingly select efficient power
supply). Configuration is also possible in which each servomotor has its own individual power supply.
If both analog and digital servomotors are used in the system, their common power supply is possible – see description of
digital servomotor power supply, found below in the manual.
3.7.2 Connection diagrams - actuator with analog input
3 contacts are provided for connection of each servomotor:
•
IN
- return signal input informing about position of the servomotor,
•
OUT
- control signal output fixing servomotor position,
• GND - ground.
GND contact is present on each of the connectors, but this is a common signal without galvanic insulation between different
connectors, what can be use to possibly simplify cabling.
Figure 3.7 and Figure 3.8 present typical connection diagrams for Belimo and Johnson Control servomotors.
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