Electric Drives
and Controls
A−1Bosch Rexroth AGBT 6.001070080078 / 03
Annex
A Annex
A.1 Abbreviations
%I General abbreviation for current, can be
measured in kA or in SKT (scale values)
AC Alternating Current
CT Cool time, time between the current im-
pulses/blocks (1., 2., 3.CT)
DC Direct Current
DST Downslope time. Time in which the %I de-
creases until the end of the 2.WLD.
EMC Electromagnetic compatibility
ESD Electrostatic discharge, abbreviation for all
terms that concern electrostatic discharges,
e.g. ESD protection, ESD hazard, ESD-
sensitive components
ext. External, e.g. in connection with a +24V
voltage for signal transducers (switches)
and actuators (valves) outside the timer.
FPO Freely programmable output. Not available
with all timers.
GUI Graphical user interface
HLD Hold time, time after the last weld time, in
which the welded part can cool down.
HSA Main Switch Trip
IMP Number of impulses that form the 2.WLD
kA kilo Amps
KSR
Constant current regulation. Keeps the cur-
rent in the welding circuit constant.
KUR
Constant voltage regulation. Balances line
fluctuations.
LT Power supply unit (thyristor or inverter)
MC Monitoring contact, e.g. for monitoring the
pressure inside the cylinder that closes the
electrodes or monitoring of the electrode
position, e.g. ”gun closed”
MF Medium frequency
ms Milliseconds
NBS see WI
NWZ Post-heating time, also referred to as
3.WLD
OFF Off time, time between two spot welds in
which the solenoid valve is not triggered.
Relevant for Repeat mode only.
P Periods (mains cycles).
At 50 Hz mains frequency: 1 P −> 20 ms.
PE Protective Earth
PG Programming device / welding computer
PHA Phase angle (shift)
PLC Programmable Logic Controller
PSG Transformer-rectifier unit for the PSI in-
verter series
RA (RO) Relay output
REPEAT
Repeat mode. Mode for manually operated
systems only
SING Single spot mode. For automatic and
manual welding machines
SKT (scale
values)
Measure of the electric phase angle
Slope Current ramp, current increases/decreases
from an initial to a final current value
Solenoid Solenoid valve, controls the cylinders for
closing the electrodes
SING Single spot mode. For automatic and
manual welding machines
SQZ Squeeze time. Time that runs before the
weld time. The electrodes squeeze the
parts to be welded together.
Stepper Current stepping for compensation of elec-
trode wear
Temp. Temperature
UST Up-slope time. Time in which the %I in-
creases from the beginning of the 2.WLD.
VWZ Preheating time, also referred to as 1.WLD
WC Weld complete. Signal output upon comple-
tion of a weld cycle.
Weld / No
weld
Ignition, firing pulses for triggering the
power unit are switched on and off
WI Mains load limitation control (Welder inter-
lock), monitors and influences the mains
load
WLD Weld time. The following types of WLD ex-
ist: 1.WLD (preheating weld time); 2.WLD
(main weld time); 3.WLD (postheating weld
time)
Time and current (%I) of all 3 weld times
can be programmed separately.
Programming of impulses and slope is only
possible in the 2.WLD
WT Weld timer, also referred to as timer, or re-
sistance weld timer
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