Sequence Of Operation; Vlt ® Servo Access Box (Sab); Vlt ® Integrated Servo Drive Isd 510; Switching On The Vlt ® Integrated Servo Drive Isd 510 System - Danfoss VLT ISD 510 Design Manual

System Overview

2.6 Sequence of Operation

2.6.1 VLT ®
Servo Access Box (SAB)
Illustration 2.8 shows a simplified block diagram of the SAB.
Ethernet X1
Ethernet X2
AC mains supply
3 4
24/48 V IN
6
STO 1 IN: STO 1
8
STO 2 IN: STO 2
1 Control logic Used for communication and
monitors the status of the SAB.
2 SMPS (Switch mode power Used to generate the control
supply) voltage from the intermediate
bus.
3 When power is first applied to the SAB, it enters through the
input terminals (L1, L2, and L3) and on to the RFI filter.
4 Following the rectifier section, voltage passes to the
intermediate section. This rectified voltage is smoothed by a
sine-wave filter circuit, consisting of the DC bus inductor and
the DC bus capacitor bank. The DC bus inductor provides
series impedance to changing current. This aids the filtering
process while reducing harmonic distortion to the input AC
current waveform normally inherent in rectifier circuits.
5 Switch For enabling or disabling the UDC
output lines. Inrush current
limitation for the servo drives is
also done within this section.
6 Overvoltage/overcurrent For the auxiliary line.
protection
7 LED indicators Show the presence of the AUX
voltage at the outputs of the SAB.
8 LED indicators Show the presence of the STO
voltage.
Illustration 2.8 Simplified Block Diagram of the Servo Access
Box
2.6.2 VLT ®
Integrated Servo Drive ISD 510
Table 2.1 shows a simplified block diagram of the ISD 510
servo drive.
MG36C102
Design Guide
Ethernet X3
1
Ethernet X4
2
ISD Line 1: UDC 1
5
ISD Line 2: UDC 2
ISD Line 1: AUX 1
7
ISD Line 2: AUX 2
ISD Line 1: STO 1
ISD Line 2: STO 2
Danfoss A/S © 08/2017 All rights reserved.
STO+
1
STO–
UDC+
2
UDC–
AUX+
AUX–
Ethernet
6
1 STO circuit If STO is activated, the STO circuit disables
the inverter.
2 DC bus and filter The DC bus and filter smooth the voltage.
3 Inverter In the inverter section, once run
command and speed/position references
are present, the IGBTs begin switching to
create the output waveform.
4 Motor Synchronous permanent magnet motor.
5 Control circuit Used for generating the PWM pattern and
monitoring the status of the ISD.
6 X4: M12 I/O This interface can be used to connect
and/or encoder digital inputs/outputs. It can also be used
connector for analog values. SSI/BISS encoders can
(advanced servo be connected to this interface.
drive only)
7 X5: LCP connector An LCP can be connected to read out
(advanced servo parameters and set-up of the servo drive.
drive only)
8 X3: Ethernet This interface can be used to connect
connector external real-time Ethernet devices.
(advanced servo
drive only)
Illustration 2.9 Simplified Block Diagram of the ISD 510 Servo
Drive
2.6.3 Switching on the VLT
Servo Drive ISD 510 System
The cabling in the ISD 510 servo system provides the
supply voltage and the communication signals. This is a
fundamental requirement for operation of the servo drives.
The ISD 510 servo system can be switched on in 3 ways:
•
If the SAB is supplied with mains and U
communication to the SAB internal controller is
established and U
AUX
to the connected servo drives.
•
If the SAB is only powered by U
and servo drive control units are running.
3
4
5
7 8
Advanced
servo drive
®
Integrated
,
AUX
is automatically passed on
, then the SAB
AUX
15
2 2