Siemens SINUMERIK 840D Description Of Functions page 145

04.00
02.99
!
5532 POWER_ENABLE_DELA Y
Power enable delay period
Unit: Default:
ms 100
 Siemens AG 2000. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital Descr. of Functions HLA Module (FBHLA) – 04.00 Edition
This voltage source is monitored by the HLA module such that an internal sig-
nalling bit "24 V valve supply voltage missing" is set by the hardware when the
voltage drops below a specific threshold. As long as the "valve supply voltage
missing" bit is set, a power enable command is rejected and thus the status bit
"Velocity controller enable" also set 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
26.5 V 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
shutoff 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 reaction time is mainly defined by
S
the power required for the current machining step,
S
the response time of the shutoff valves and
S
the trip threshold of the servo solenoid valves.
Minimum: Maximum:
0 300
If a shutoff valve is connected (MD 5530, bit 0=1), the switch remains open
for that time, i.e. the shutoff valve is closed.
This gives the servo solenoid valve time to move into the mid-position with-
out pressure from the fail-safe position. 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 shutoff valve is connected, zero can be entered as the power enabling
delay period.
4 Firmware Drive Functions
4.12 Terminals
Cross ref.: –
Relevant for: Protection level:
HLA
Data type: Effective:
UNS.WORD Immediately
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