2.4 Symbols and abbreviations
This section tells about used symbols and abbreviations in this manual. The table that follows gives
the descriptions.
Symbol
Description
Symbol
Description
ACS
Automatic control-system
PLC
PLC Control
BOS
Basic Output Shafts (RW)
PTO
Thermal-overload protection-switch
C
Common connection
PZ
Cross head “Pozidriv”
D
Model with continuous worm-shaft
P21/1
Auxiliary contact K21
EM, M
Electric motor, Motor
P22/1
Auxiliary contact K22
EMC
Electromagnetic compatibility
P71, P72 Automatic-control contacts (ACS)
ESD
ElectroStatic Discharge
RLL
Ridder LogicLink
ES11,ES12 Duty switch RLS/RSU
RLS
Limit-switch system
ES21,ES22 Safety switch RLS/RSU
RMC
Ridder MotorControl
F1
Fuse
rpm
revolutions per minute
HEX
Hexagonal width-across-flats
RPT
Ridder PolyTelescope
I
Current in Amperes (A)
RPU
Ridder PositioningUnit
IP
International Protection Rating
RRD
Ridder RackDrive
K
Designation sprocket (assembled
configuration)
RSD
Ridder ScreenDrive
RSU
Limit-switch system
kb
Maximum running time in minutes
(kb = KurzBetrieb/ Short operation)
RW
Motor gearbox
SBI
Standard Bolt-Installation
K11
Auxiliary relays (safety switches)
SID
Screw-in depth
K21, K22 Reversing relay (sufficiently specified)
for direction-of-rotation
SS (S21)
System switch (S21)
SW
Width-across-flats
K81
Auxiliary relay: 1-phase, 3-wire to
5-wire
S11
Manual switch (bridged safety circuit)
S21 (SS)
System switch (SS)
L
Model with winch shaft
S111
Manual switch (MC)
L1
Voltage source
TRA
Model for built-on rack unit
MC
Manual Control
TRI
Rack drives TRI
MPCB/
Q41
Motor-Protection Circuit-Breaker
TRN
Rack drives TRN
TX
Screw head “Torx”
N
Neutral wire
T1
Safety transformer (EN 61558)
NC
“normally closed”
U1, U2
Motor connection
NO
“normally open”
V1
Motor connection
PE
Protective earth
W1, W2
Motor connection
PH
Cross head “Phillips”
Ridder Drive Systems B.V.
T
+31 (0)341 416 854 -
F
+31 (0)341 416 611 -
I
7