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USS protocol: Brief start-up guide for SIMOREG 6RA70 converters
G-SST1
RS232 / RS485
G-SST1
RS485
for connection of an OP1S
G-SST2 / G-SST3
RS485
Select USS protocol
P780 = 2
P780 = 2
P790 / P800 = 2
Baud rate
P783 = 1 to 13, corresponding to
300 to 187500 baud
P783 = 6 (9600 Bd) or
7 (19200 Bd)
The baud rate setting must be
identical for every node in bus
operation
P793 / P803 = 1 to 13,
corresponding to 300 to 187500
baud
No. of process data (PZD No.)
(applies to Receive and Send)
P781 = 0 to 16
P781 = 2
P791 / P801 = 0 to 16
PZD assignment for control word
and setpoints
(received process data)
All received process data are
taken to connectors and must be
wired up as required
If the control bits from the OP1S
are to be used:
Word 1 (connector K2001):
Wiring up of control bits
from OP1S, see Sec. 7.2.2
Word 2 (connector K2002):
Not used
All received process data are
taken to connectors and must be
wired up as required
No. of PKW
P782 =
0:
No PKW data
3 / 4: 3 / 4 PKW data words
127: Variable data length for
slave
→
master
P782 = 127 variable data length
P792 / P802 =
0:
No PKW data
3 / 4: 3 / 4 PKW data words
127: Variable data length for
slave
→
master
PZD assignment for actual
values
(transmitted process data)
Selection of transmitted values
via P784
Word 1: P784.i01=32
(stat. word 1 K0032)
Word 2: P784.i02=0
Selection of transmitted values
via P794 / P804
Node address
P786 = 0 to 30
P786 = 0 to 30
Every node must have its own,
unique address for bus operation
P796 / P806 = 0 to 30
Telegram failure time
P787 = 0.000 to 65.000s
P787 = 0.000s
P797 / P807 = 0.000 to 65.000s
Bus termination
P785 = 0: Bus term. OFF
1: Bus term. ON
P785 = 0: Bus term. OFF
1: Bus term. ON
P795 / P805 =
0: Bus term. OFF
1: Bus term. ON
Bus / point-to-point
communication
RS232: Only point-to-point
operation possible
RS485: Bus operation possible
Bus operation possible
Bus operation possible
2-wire / 4-wire transmission
via RS485 interface
2-wire operation is selected
automatically
2-wire operation is selected
automatically
2-wire operation is selected
automatically
Cable
Connector assignments, see
Sect. 6.8 or Sheet G170 in
Sect. 8
See operating instructions for
OP1S operator panel
Connector assignments, see
Sect. 6.8 or Sheets G171, G172
in Sect. 8
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SIMOREG DC-MASTER Operating Instructions
Connection example for a USS bus
4
11
14
+
8
6
4
SIMATIC S5
-
Rx
Tx
12
10
X3
X3
150
Ω
1)
2)
Rx
Tx
6RA70
-
+
+
Rx
Tx
6RA70
-
+
+
Rx
Tx
6RA70
-
+
+
59
58
59
58
59
58
CP524 with RS485
-module ...0AA43
(Jumper X3: 20-18 -->
2-wire cable)
SUB-D connector
15-pin
Master
(Bus terminating
resistors activated)
Slave 1
(Bus terminating
resistors deactivated)
Slave 2
(Bus terminating
resistors deactivated)
Slave n (n<=31))
(Bus terminating
resistors activated)
1) The interface cable shields must be connected directly on the converter with the lowest possible
impedance to converter or cubicle earth (e.g. via clamp).
2) Twisted cable, e.g. LIYCY 2x0.5 sqmm; with longer cables, an equipotential bonding conductor
must be used to ensure that the difference in frame potentials between nodes stays below 7 V.
9.13.2 Serial interfaces with peer-to-peer protocol
The term "Peer-to-peer link" refers to a "Link between partners of equal status". In contrast to the
classic master/slave bus system (e.g. USS and PROFIBUS), the same converter can function as both
the master (setpoint source) and the slave (setpoint receiver) in a peer-to-peer link.
Signals can be transferred in fully digital form from one converter to another via the peer-to-peer link,
for example:
− Velocity setpoints for producing a setpoint cascade, e.g. on paper, foil and wire-drawing
machines and on fiber-drawing machinery.
− Torque setpoints for closed-loop load distribution controls on drives that are coupled
mechanically or via the material, e.g. longitudinal-shaft drives on printing presses or S-roll drives
− Acceleration setpoints (dv/dt) for acceleration precontrol on multi-motor drives.
− Control commands
Useful data which can be transferred via the peer-to-peer link
Sheets G173 and G174 in Section 8 show how useful data can be interconnected and list the
parameters relevant for configuring peer-to-peer links. Any connectors can be parameterized as
transmit data (numeric representation: 100% equals 4000h = 16384d).
Parameters cannot be transferred via the peer-to-peer link.
Transfer of double-word connectors:
In the receive direction, the values of any two adjacent connectors (K) are combined to form a double-
word connector (KK) (e.g. K6001 and K6002 to KK6081). These double-word connectors can be
connected in the usual way to other function blocks. For details of how to connect with double-word
connectors, see Section 9.1, subsection "The following rules apply to the selection of double-word
connectors".
In the transmission direction, a double-word connector is applied by entering the same double-word
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SIMOREG DC-MASTER Operating Instructions
connector at two contiguous indices of the selection parameter.
Examples:
.04
.01
.03
.02
P794
KK9498
KK9498
K0401
K0402
L-Word
H-Word
Word
Word
401
9498
9498
K
K
K
402
K
.04
.01
.03
.02
P794
KK9498
KK9499
K0401
K0402
H-Word
H-Word
Word
Word
401
9498
9499
K
K
K
402
K
2 different
double-word connectors
Diagnostics and monitoring functions for peer-to-peer link
All transmitted and received useful data words can be checked (directly at the internal software
transfer point from/to peer driver) by means of display parameters r812 / r813 or r814 / r815.
Diagnostic parameters r799 or r809 provide information about the chronological distribution of errored
and error-free telegrams, as well as the nature of any communication errors that have occurred. A
watchdog can be set in P797 or P807 which can initiate a shutdown on faults (F012 or F013) in the
case of timeout. By connecting binectors B6031 or B9031 to the fault message triggers (using
P798=6031 / P808=9031), it is possible to acknowledge these fault messages even if the fault is
active continuously, thereby ensuring that the drive can still be operated manually after the peer-to-
peer interface has failed.
Important !
The serial interfaces for the peer-to-peer protocol are parameterized with the same parameters used
to configure the USS protocol, although the setting ranges are different in some cases (see Notes for
relevant parameters in Parameter List, Section 11).
Peer-to-peer communication, 4-wire operation
Serial linking of converter to converter (partners of equal status).
The signal flow can pass through the drives, for example, in a series connection. In this case, each
drive forwards the data after processing only to the next drive (classic setpoint cascade).
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SIMOREG DC-MASTER Operating Instructions
Brief start-up guide for SIMOREG 6RA70 converters
G-SST2
RS485
G-SST3
RS485
Select peer-to-peer protocol
P790 = 5
P800 = 5
Baud rate
P793 = 1 to 13 corresponding to 300 to 187500
baud
P803 = 1 to 13 corresponding to 300 to 187500
baud
No. of process data (PZD No.)
(applies to Receive and Send)
P791 = 1 to 5
P801 = 1 to 5
PZD assignment for control word
and setpoints
(received process data)
All received process data are taken to connectors
and must be wired up as required
All received process data are taken to connectors
and must be wired up as required
No. of PKW
No parameters can be transferred
No parameters can be transferred
PZD assignment for actual
values
(transmitted process data)
Selection of transmitted values via P794
(indices .01 to .05)
Selection of transmitted values via P804
(indices .01 to .05)
Telegram failure time
P797 = 0.000 to 65.000s
P807 = 0.000 to 65.000s
Bus termination
P795 = 0: Bus term. OFF
1: Bus term. ON
(depending on type of link)
P805 = 0: Bus term. OFF
1: Bus term. ON
(depending on type of link)
2-wire / 4-wire transmission
via RS485 interface
"4-wire" operation is automatically selected
"4-wire" operation is automatically selected
Cable
Terminal assignments, see Section 6.8 or Sheet
G173 in Section 8
Terminal assignments, see Section 6.8 or Sheet
G174 in Section 8
Examples of peer-to-peer links
Rx
Tx
2)
+
56
57
58
59
-
-
+
+
6RA70
Rx
Tx
+
56
57
58
59
-
-
+
+
6RA70
Rx
Tx
+
56
57
58
59
-
-
+
+
6RA70
Rx
Tx
+
56
57
58
59
-
-
+
+
6RA70
Peer link type "Series connection"
Each drive receives its own individual setpoint from the drive connected upstream (classic setpoint cascade)
1) The interface cable shields must be connected directly on the converter with the lowest possible
impedance to converter or cubicle earth (e.g. via a clamp).
2) Twisted cable, e.g. LIYCY 2x0.5 sqmm; with longer cables, an equipotential bonding conductor
must be used to ensure that the difference in frame potentials between nodes stays below 7 V.
3)
Optional data feedback loop via which drive 1 can monitor operation of the entire peer chain.
Drive 1
(Activate bus terminating
resistors when a data feed-
back loop is used)
Drive 2
(Bus terminating
resistors activated)
Drive 3
(Bus terminating
resistors activated)
Drive n
n=any number
(Bus terminating
resistors activated)
Data feedback loop 3)
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SIMOREG DC-MASTER Operating Instructions
2)
1)
Rx
Tx
+
56
57
58
59
-
-
+
+
6RA70
Rx
Tx
+
56
57
58
59
-
-
+
+
6RA70
Rx
Tx
+
56
57
58
59
-
-
+
+
6RA70
Rx
Tx
+
56
57
58
59
-
-
+
+
6RA70
Peer link type "Parallel connection"
Up to 31 drives receive identical setpoints from drive 1
1) The interface cable shields must be connected directly on the converter with the lowest possible
impedance to converter or cubicle earth (e.g. via a clamp).
2)
Twisted cable, e.g. LIYCY 2x0.5 sqmm; with longer cables, an equipotential bonding conductor
must be used to ensure that the difference in frame potentials between nodes stays below 7V.
Drive 1
Drive 2
(Bus terminating
resistors deactivated)
Drive 3
(Bus terminating
resistors deactivated)
Drive n (n <= 32)
(Bus terminating
resistors activated)
2)
1)
Rx
+
56
57
58
59
-
-
+
+
6RA70
Rx
+
56
57
58
59
- +
6RA70
Rx
+
56
57
58
59
-
+
+
6RA70
Rx
+
56
57
58
59
-
+
+
6RA70
1
0
Tx
-
+
1
0
Tx
1
0
Tx
1
0
Tx
-
-
Peer link type "Bus connection"
Up to 31 drives receive identical setpoints from one drive. The setpoint source drive is selected with
"Enable transmit" = 1. "Enable transmit" = 0 must be preset for all other drives.
1) The interface cable sheilds must be connected directly on the converter with the lowest possible
impedance to converter or or cubicle earth (e.g. via a clamp).
2) Twisted cable, e.g. LIYCY 2x0.5 sqmm; with longer cables, an equipotential bonding conductor
must be used to ensure that the difference in frame potentials between nodes stays below 7V.
Bus terminating
resistors deactivated
Bus terminating
resistors deactivated
Bus terminating
resistors activated
Transm.
data
Enable
transmit=1
Bus terminating
resistors activated
Enable
transmit=0
Enable
transmit=0
Enable
transmit=0
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SIMOREG DC-MASTER Operating Instructions
9.14 Thermal overload protection of DC motor
(I2t monitoring of motor)
The I2t monitoring function is parameterized in parameters P100, P113 and P114. If these parameters
are adapted correctly, the motor is protected against overloading (not all-round motor protection).
This monitoring function is disabled in the factory setting of the parameters (P820 i006 = 37).
Adaptation
P114:
A time constant T
motor
in minutes for the I2t monitoring function must be entered in
parameter P114.
P113, P100: The permissible continuous current of the motor must be defined by parameters P100
and P113.
The permissible continuous current is the product of the calculation P113 * P100.
Warning characteristic / switch-off characteristic
If the motor is loaded constantly, for example, with about 125% of the permissible continuous motor
current, then alarm A037 is triggered after a time constant (P114) has elapsed. If the load is not
reduced, then the drive is shut down when the switch-off characteristic is reached and fault message
F037 displayed.
Warning/switch-off times for other loads can be calculated from the diagram.
Alarm message triggering by motor I2t monitoring function
This diagram shows how long it takes for an alarm message to be triggered if, after a long preloading
period (> 5
*
T_th), a new constant load value is injected abruptly.
T_th = P114 .. thermal time constant of motor
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
0
0,5
1
1,5
2
2,5
3
Time / thermal time constant of motor
Load current / permissible continuous current (P100 x P113)
0% preloading
20% preloading
40% preloading
60% preloading
80% preloading
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SIMOREG DC-MASTER Operating Instructions
Fault message triggering by motor I2t monitoring function
This diagram shows how long it takes for a fault message to be triggered if, after a long preloading
period (> 5
*
T_th), a new constant load value is injected abruptly.
T_th = P114 .. thermal time constant of motor
0
0,5
1
1,5
2
2,5
3
3,5
4
4,5
5
0
0,5
1
1,5
2
2,5
3
Time / thermal time constant of motor
Load current / permissible continuous current (P100 x P113)
0% preloading
20% preloading
40% preloading
60% preloading
80% preloading
CAUTION
When the electronics power supply fails for longer than 2 s, the calculated motor preloading
value is lost. When the supply is reconnected, the system assumes that the connected motor
has not been loaded at all!
If the electronics power supply fails and the converter is switched on again within 2 s (e.g. via
the "Automatic restart" function), then the temperature calculation is based on the last calculated
l2t value of the motor..
The I2t monitoring function reproduces only a rough thermal image of the motor, i.e. it does not
provide all-round motor protection.
If P114 (T
motor
) is set to zero, then the I2t monitoring function is deactivated.
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SIMOREG DC-MASTER Operating Instructions
Calculation of thermal equivalent time constant (P114)
It must be noted that the thermal equivalent time constant is dependent on the maximum overcurrent.
Thermal equivalent time constant of 1G . 5/1H . 5 DC motors according to Catalog DA12.
100
120
140
160
180
200
1
40
2
4
3
5
6
8
10
20
30
P114
I
[%]
I
I
rated
I
rated
... Rated motor armature current (=P100)
I ... Maximum overcurrent at which motor is operated
NOTES
• When other motor types are connected, the manufacturer's specifications apply.
• If you are using DC motors 1G.5 / 1H.5 as specified in catalog DA12, parameter P113 must
be set to 1.00
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9.15 Dynamic overload capability of power section
9.15.1 Overview of functions
The converter rated DC current specified on the rating plate (= maximum permissible continuous
direct current when P077 = 1.00) may be exceeded in operation. The amount and permissible
duration of the overload are subject to limits which are explained in more detail below.
The absolute upper limit for the absolute value of overload currents corresponds to 1.8 times the
converter rated DC current * P077 (= r072.001 * P077). The maximum overload period depends both
on the time characteristic of the overload current and on the load history of the converter and differs
depending on the installed power section.
Every overload must be preceded by an "underload" (load phase at load current < P077 * rated DC
current). After the maximum permissible overload period has expired, the load current must be
reduced to a value of at least ≤ P077 * converter rated DC current.
The dynamic overload period is made possible by a thermal monitoring function
(I2t monitor) in the
power section. This uses the time characteristic of the actual load current to calculate the time
characteristic of the thyristor temperature rise over ambient temperature. When the converter is
switched on, the calculation commences with the initial values that were calculated before the
converter power supply was last switched off/last failed. Allowance can be made for ambient
conditions (ambient temperature, installation altitude) by the setting in parameter P077.
In the delivery state, the ambient temperature is always set to the maximum permissible value
(i.e. 45°C for naturally cooled converters and 40°C for converters with forced cooling).
The I2t monitoring function responds when the calculated thyristor temperature rises exceeds the
permissible limit. Two alternative responses to the monitor can be parameterized:
P075 = 1: Alarm A039 with reduction of armature current setpoint to P077 * converter rated DC
current
P075 = 2: Fault F039 followed by converter shutdown
The I2t monitoring function can be deactivated. In this case, the armature current is limited to the
setting in P077 * converter rated DC current (= P077 * r072.001).
Connector K310 contains the calculated thyristor overtemperature as a % of the maximum
permissible
converter-specific thyristor overtemperature:
80°C on 15A to 60A converters
85°C on 90A to 140A converters
90°C on converters of > 200A converter rated armature DC current.
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