Siemens Sinumerik 840D Series Function Manual page 147

04.00
10.03
!
5532 POWER_ENABLE_DELA Y
Power enable delay time
Unit: Default:
ms 100
 Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
This voltage source is monitored by the HLA module such that an internal
signaling bit "24 V valve supply voltage missing" is set by the hardware when
the voltage drops below a specific threshold. While the "Valve supply voltage
missing" bit is set, any power enable command will be rejected, thus setting the
"velocity controller enable" status bit to zero.
S
Failure of 26.5 V supply during operation
The power is disabled and status bit "Velocity controller enable" canceled.
The module does not output an error message.
S
Recovery of 26.5 V supply voltage or after initial connection of the
26.5V supply voltage
The power is not enabled until the power enabling delay set in MD 5532 has
expired.
Warning
In the event of sudden failure (e.g. open circuit) of the external 26.5 V supply,
an axial storage capacitor on the HLA module provides energy to supply the
servo solenoid valve until such time as the pressure supply for a configured
shut-off valve is disabled.
The machine manufacturer must verify the interaction between valves, making
allowance for all tolerances in the controlled system.
The energy content of the storage capacitors is dependent upon
S
the tolerances of the capacitors,
The available response time is mainly defined by
S
the power required for the current machining step,
S
the response time of the shut-off valves and
S
the trip threshold of the servo solenoid valves.
Minimum: Maximum:
0 300
If a shut-off valve is connected (MD 5530, bit 0=1), the switch remains open
for that time, i.e. the shut-off valve is closed.
This gives the servo solenoid valve enough time to move into the mid-posi-
tion from the fail-safe position without pressure. In such cases, the power
enabling delay period must be set to the time required by the valve to move
from fail-safe to mid-position.
If this operation were to take place under pressure, the drive would move. If
no shut-off valve is connected, zero can be entered as the power enabling
delay period.
4 Firmware Drive Functions
4.12 Terminals
Cross reference: -
Related to: Protection level:
HLA
Data type:
Active:
UNS.WORD
Immediately
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