Siemens SIMODRIVE 611A, Инструкция по установке и планированию

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Siemens AG 1998 All Rights reserved 6SN1197–0AA00 02.98 Edition
SIMODRIVE 611 (PJ)
Supply failure buffering/retraction concept
Set switch S1.2 in the NE module (if available, also in the monitoring module) to
ON = fault signal (the ready relay is then independent of terminal 63 and termi-
nal 64). If the ready relay drops–out when the power fails, a zero setpoint is
entered via terminal 64, and the drives can be braked down to standstill. In this
case, the auxiliary power supply, terminal P500 and terminal M500 of connector
X181 must be connected to the DC link terminals P600 and M600 of the NE
module. The electronics power supply for the control is maintained as long as
the auxiliary power supply can be maintained.
When an I/R module is used, an additional pulsed resistor module must be in-
stalled in the drive group (if required, an external pulsed resistor), in order to
convert the braking energy of the drives into heat (a far higher level of braking
energy can be converted into heat using an external pulsed resistor).
When using an UE module, the internal pulsed resistor can also be used and it
still remains active even when the power fails. If the internal braking resistor is
not adequate (braking energy too high), then an additional pulsed resistor mo-
dule must also be used.
Dimensioning and engineering the pulsed resistor module and the external pul-
sed resistor, refer to Section 3.2.
The energy stored in the DC link which can be used is limited. At the supply
failure instant:
for I/R modules: E
DC link contents
= 130
@ Σ
C
DC link
– 14
for UE modules: E
DC link contents
= 70
@
Σ
C
DC link
– 14
E
DC link contents
in Ws, C
DC link
in mF,
Σ
C
DC link
= sum of all the DC link capacitances in the system
Refer to Catalog NC 60.1
A line failure identification time of t
N OFF
of approx. 30 ms expires before the
ready relay indicates that the line supply has completely failed.
The supply is missing in this 30 ms. However, the drives could be in a load duty
cycle, by withdrawing power from the DC link. The maximum power drawn du-
ring the unfavorable load duty cycle must be specified for this withdrawn power.
The following is valid: P
max drawn
[W]
@
0.03 s < E
DC link
.
If this condition is not fulfilled by the time it has been identified that the supply
has failed, the DC link voltage may have fallen to < 290 V. At this voltage, the
pulse enable of the drive is withdrawn, and the drives coast down.
!
Important
In order that the drive brakes controlled and the contour is still maintained down
to standstill, terminal 48 and terminal 63 must be kept energized until the drives
come to a standstill.
Procedure
9.4.2 Supply failure buffering/retraction concept