Siemens Sinumerik 840D Series Function Manual page 150

Hla module
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4 Firmware Drive Functions
4.12 Terminals
Velocity controller
enable
4-150
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.
SINUMERIK 840D/SIMODRIVE 611 digital, HLA Module (FBHLA) - 10.03 Edition
 Siemens AG, 2003. All rights reserved
02.99
10.03

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Simodrive 611 digitalSinumerik 840dieSinumerik 840dSinumerik 840deSinumerik 840di

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