SCHIEBEL SRG5 Series User manual

Positioner SRG 5xx
DS-ENGLISH-SRG5XX-V2.00-2012.07.17
SEC-DS-ENGLISH-SRG5XX-V2.00-2012.07.17
Positioner SRG5ss
1 General
The SRG5xx positioner (see Figure 1) facilitates the control of an electric actuator by
means of a set point with voltage output 0(2)...10V. A potentiometer with a resistance
value of 100Ωto 10kΩis used as an actual value in the actuator. The position control of
the actuator is carried out using the SRG5xx, i.e. the positioner ensures that the actual
value and thus the position of the actuator follows the set point.
Figure 1: Symbol
2 Operation and electrical connection
The set point voltage U10(2)...10V is connected to the terminals 77 (plus) and 78 (minus). The actual value
(actuator position) is determined in the SRG5xx from the position of the actual value potentiometer (connected
to the terminals 74 to 76) coupled with the actuator. This actual value is compared with the set point in the
positioner. If both values are equal except for a residual difference (adjustable with potentiometer D), none of
the two relays (K3, K4) on the positioner picks up (see Figure 2).
Figure 2: Basic wiring diagram
If the set point is larger than the actual value, the K4 relay picks up (the corresponding yellow LED lights), the
actuator must open. If the actual value is larger than the set point, the K3 relay picks up (the corresponding
yellow LED lights), the actuator must close. The control of the motor may be carried out directly via the relays
of the SRG or via an additional reversing starter unit depending on the motor type.
The reference voltage required for control and the BZL reference line are separated galvanically from the
supply. Thus, various positioners can be connected in series to the same set point (synchronization control,
split-range control).
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3 Connection model
Positioner SRG 5xx
DS-ENGLISH-SRG5XX-V2.00-2012.07.17
3 Connection model
The positioner can be supplied in sub-unit terminal screw block (see Figure 3) or in insert card block (see
Figure 4) version.
The connection model is determined by the third digit of the designation (SRG5x1 for insert card block (see
Figure 4) and SRG5x2 for sub-unit terminal screws (see Figure 3)).
Figure 3: SRG 5x2 Figure 4: SRG 5x1
4 Instructions for adjustment
Switching difference D:
The switching difference (see Figure 5) is adjusted using potentiometer D (see Figure 3 and 4). If a more exact
positioning of the actuator is desired, then the switching difference must be reduced. If the switching difference
is too small, the actuator will start to oscillate. In case of actuator oscillation, the switching difference must be
increased. This is achieved by turning potentiometer D in a counter-clockwise direction.
Figure 5: Switchpoints of 3-point controller
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Positioner SRG 5xx
DS-ENGLISH-SRG5XX-V2.00-2012.07.17 5 Technical datan
Filter V:
The filter type used is a phase-zero filter. This filter limits the increase speed of the control deviation. The
effect of disturbances (high increase speed) is reduced effectively without impairing the control behaviour.
ATTENTION! A too large filter effect will cause the actuator to oscillate.
The filter effect is reduced by turning the potentiometer V in a clockwise direction.
Adjustment procedure:
Adjust actuator according to operating instructions for the actuator. Set filter effect to minimum position by
turning potentiometer V in a clockwise direction.
Initial value: Feed 0V (terminals 77 (plus) and 78 (minus)) at voltage input. The actuator moves into final po-
sition "CLOSED" and is switched off via microswitches S1 (torque depending closing) or S3 (travel depending
closing). Turn potentiometer A on SRG in clockwise direction until relay K3 is released (can be seen on light
emitting diode).
Final value with set point 0...10V: Feed 10V (terminal 77 (plus) and terminal 78 (minus) at voltage input.
The actuator moves in direction "OPEN" and the travel switch S4 (travel depending opening) and torque switch
S2 (torque depending opening) should switch. If S4 or S2 have not already switched, turn potentiometer E in
clockwise direction until S4 or S2 responds and relay K4 remains picked up. Then turn potentiometer E slowly
in counter-clockwise direction until relay K4 is released and K3 does not pick up yet.
Final value at set point 2...10V: Feed 8V (terminal 77 (plus) and terminal 78 (minus) at set point input. The
actuator moves in direction "OPEN" and the travel switch S4 (travel depending opening) and torque switch
S2 (torque depending opening) should switch. If S4 or S2 have not already switched, turn potentiometer E in
clockwise direction until S4 or S2 responds and relay K4 is released. Increase set point to 10V, K4 picks up.
Turn potentiometer A in counter-clockwise direction until relay K4 is released and K3 does not pick up yet.
Control and correction of adjustment:
Initial value: Feed minimum set point (0 or 2V). The actuator moves into final position "CLOSED". If S3
or S1 switches and K3 remains picked up, turn potentiometer A in clockwise direction until K3 is released
and K4 does not pick up yet. If K3 is released and S3 or S1 has not switched yet, turn potentiometer A in
counter-clockwise direction until S3 or S1 switches. If K3 remains picked up, turn potentiometer A in clockwise
direction until K3 is released and K4 does not pick up yet.
Final value: Feed set point 10V. The actuator moves into final position "OPEN". If S4 or S2 switches and K4
remains picked up, turn potentiometer E in counter-clockwise direction until K4 is released and K3 does not
pick up yet. If K4 is released and S3 or S1 has not switched yet, turn potentiometer E in clockwise direction
until S3 or S1 switches. If K4 remains picked up, turn potentiometer E in counter-clockwise direction until K4 is
released and K3 does not pick up yet.
Finally, determine the optimum adjustment of the switching difference with set point steps. When turning po-
tentiometer D in a counter-clockwise direction, the switching difference is increased. The set point steps should
be in the opposite direction (reverse clearance) and their magnitude selected so that the actuator is able to
reach its set point speed.
Then the filter effect can be increased to the desired stability reserve again by turning potentiometer V in
a counter-clockwise direction.
5 Technical datan
Supply voltage:
SRG21X ................................................220V AC,+10%/-15%,47...63 Hz
SRG22X ................................................20...30VDC, smoothed;(+...63, -...61)
SRG23X.................................................110VAC, +10%/ -15%, 47...63Hz
Power consumption ............................................approx. 1,5VA
Ambienttemperature ...........................................-20...+60◦C
Setpointsignal .................................................0(2)...10 V
Actualvalue potentiometer .....................................100Ω. . . 10kΩ
Switchingdifference ............................................0,5...5%offinalvalue
Hysteresis ......................................................approx. 25%ofswitching difference
Relay:
Switchingcapacity .......................................4A,250VAC1
Mechanicallife ...........................................20 mill. cycles
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5 Technical datan
Positioner SRG 5xx
DS-ENGLISH-SRG5XX-V2.00-2012.07.17
Electromagnetic compatibility:
The function of the SRG can be influenced by heavy electro-magnetic disturbances. After interference decay,
the original function is restored and new alignment is not necessary. We advise to use shielded cables for the
signal lines of the SRG.
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