10.03
4.12 Terminals
4-150
Siemens AG, 2003. All rights reserved
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
Operating sequence for PD (power disable):
S 24 V supply for shut-off valve is disconnected immediately (shut-off valve
closes).
S If MD 5530 bit 4=0 is set, the 24 V supply for the servo solenoid valve is also
switched off when the manipulated variable enable delay (MD 5531) runs
down (servo solenoid valve moves to fail-safe position).
If MD 5530 bit 4=1 is set, the 24 V supply for the servo solenoid valve re-
mains connected.
S If MD 5530 bit 0=0 is set (no shut-off valve), then the 24 V supply for the
servo solenoid valve is switched off immediately (servo solenoid valve
moves to fail-safe position).
S Velocity controller enable status bit is reset immediately.
- Valve setpoint=0 V is output
- Controller I-components are cleared.
- Valve spool monitoring is deactivated
S If a central shut-off valve is installed, it is left to the user to gate the signals
(e.g. using the PLC) such that the central shut-off valve is actuated when the
power is disabled.
To prevent errors on other axes, it should be ensured that all axes whose
pressure is supplied via the central shut-off valve also receive the power
disable command when the central shut-off valve is actuated.
S If a separate shut-off valve (axis-specific shut-off valve) is installed for
each axis, this need only be connected to the “shut-off valve” relay output of
the relevant axis.
After the power has been disabled, the switch for the 24 V supply is either
opened or not (depending on the setting of bit 4 in MD 5530) at the end of the
manipulated variable enable delay. The default setting has been selected such
that the 24 V valve supply voltage is disconnected (bit 4 =0), thus moving the
valve into the fail-safe position.
This will not be necessary if a shut-off valve is installed and actuated. This func-
tion has been integrated for cases where a shut-off valve has been set, but is
not actually connected. In such cases, this function prevents the drive from be-
ing able to drift after a power disable. After a function test, bit 4 in MD 5530 can
be set to 1.
A velocity controller enable/disable can be requested via the following paths:
S Terminal 64 (central velocity controller enable)
S Control word (from NC)
S Error (ZK1)
If a velocity controller enable is requested and all the relevant enable conditions
are fulfilled, i.e.
S manipulated variable enable delay run down,
S 24 V supply for shut-off and SS valves ON,
S power enable signal set and
S No error
then the “Velocity controller enable” status bit is set.
Velocity controller
enable
4 Firmware Drive Functions
02.99
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