PMC-2 Instruction Manual
Page 34 BA * PMC-2 * EN * 01/98
Control voltage
The control voltage can be earthed.
With the 24 V DC for the control voltage also other sinks can be supplied. Please make sure that
the tolerances for the 24 V DC control voltage have to be met. This is especially important for
applications with inductivities (magnetic valves, brake, etc.).
A checking of the control voltage with a voltmeter is not sufficient. An oscilloscope must be used
in order to recognise short-term intrusions in the control voltage (e. g. when switching inductive
sinks).
CAUTION
If the tolerances for the control voltage are not observed the following errors
could occur:
• E588 control voltage low
• WATCHDOG
Note:
For around 10 ms there is a switch-on power of approx. 10 A per PMC-2.
T1 - operation
The operating mode T1 is for the observing of the safety instructions at stations where works are
to be accomplished in danger area (installing and testing the station). The T1-operation of the
PMC-2 follows the VDI 2853. Thereby the max. velocity is reduced to 10 % referring to software
and hardware. A proceeding of the axis in manual and automatic operation is possible. The
restriction on the software side refers to P0.01 V_max. The DC-circuit tension is reduced to 10 %
max. of rated voltage by a separate feed. Due to the smaller DC-circuit tension in T1-operation
the velocity is effectively limited. Thereby a locking of T1-contactor and mains contactor is
necessary due to safety reasons (see 3.4). The monitoring of the DC-circuit tension must be
realised externally via over- and undervoltage relay, since the discharging of the DC-circuit
without DC-circuit short circuit needs > 1 min. and at the time of commutation the DC-circuit has
to be discharged.
Netzeingang Zwischenkreisspannung
Normalbetrieb 3*400V AC 560V DC
T1-Betrieb 10 - 40V AC 14 - 56V DC
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