Control Modes - salmson CC HVAC Instrucciones De Instalación Y Funcionamiento

ENGLISH
•Frequency converter: Frequency converter for load-sensitive
speed control of the base-load pump - used only with the
installation version "FC" (Item No. 4)
•Motor filter: Filter for ensuring a sinusoidal motor voltage and for
suppressing voltage peaks - available only with installation ver-
sion "FC" (Item No. 5)
•Fuse protection of drives and the frequency converter: Fuse
protection of the pump motors and the frequency converter.
≤ 4.0 kW: motor protection switch (Item
For devices with P
2
No. 6)
•Contactor/contactor combinations: contactor for switching
on the pumps. For devices with P
mal actuator excess current fusing (default value: 0.58 * I
and the time relay for star-delta switching (Item No. 7)
•Manual-0-Automatic switch: switch for selecting between the
pump operating modes "Manual" (emergency/testing opera-
tion on the mains; motor protection available), "0" (pump
switched off – no switch-on possible via SPS) and "Auto" (pump
for automatic mode enabled via SPS) (Item No. 8)

6.1.3 Control modes

The basic control mode for the installation can be preselected
in Menu 4.3.1. In the case of some control modes, settings for
the control operation can continue to be adjusted there.
An electronic signal transmitter (measurement range is to be
set in Menu 4.3.2.3) supplies the actual value of the controlled
variable, e.g. as 4...20 mA current signal. In the case of devices
with temperature sensor inputs, the change in resistance is
detected by PT100 or PT1000 sensors (optional module
required – see 6.1.2).
The following control modes can be selected:
Δp-c (differential pressure constant – see Fig. 5)
The differential pressure (between 2 installation points) is kept
constant with changing load conditions (volume flow) in
accordance with setpoint H
Multi-pump operation is possible.
Δp-c (differential pressure variable – see Fig. 6)
The control setpoint of the base-load pump is adjusted and
corrected as a function of the volume flow between H
≥ 0.4 H
H (H ). The zero-delivery head of the pump must
set min set
continue to be entered (menu 3.1).
Following the load-sensitive cut-in of one or more peak-load
pump(s), the installation operates in Δp-c mode (setpoint:
H ).
set
Multi-pump operation is possible. External analogue setpoint
specification is not possible.
p-c (absolute pressure constant – see Fig. 7)
The output pressure of the installation is kept constant with
changing load conditions (volume flow) in accordance with
setpoint p .
set
Multi-pump operation is possible.
≥ 5.5 kW, including the ther-
2
.
set
min
ΔT-c (differential temperature constant – see Fig. 8)
The differential temperature (between 2 installation points;
feed/return) is kept constant with changing load conditions
(volume flow) in accordance with setpoint ΔT.
Multi-pump operation is possible.
ΔT-v (differential temperature variable – see Fig. 9)
The differential temperature (between 2 installation points;
feed/return) is kept constant with changing load conditions
(volume flow) in accordance with setpoint ΔT (see also Fig. 8).
Setpoint ΔT is set to variable levels thereby, depending on exte-
rior or process temperature.
)
N
Multi-pump operation is possible.
n=f(Tx) (speed setter – temperature-dependent – see Fig. 10)
Depending on the input temperature, the speed of the pump
is set between f
min
Only single-pump operation is possible.
n=f (analogue) (speed actuator via external analogue signal –
see Fig. 11)
Manual control mode can be actuated by means of an ana-
logue current signal through the corresponding terminals (in
accordance with wiring diagram). This control mode can be
selected in Menu 4.3.3.3. The selection of the signal type
(0-20 mA or 4-20 mA) is also accomplished in this menu. The
input signal is always in reference to the permissible frequency
range (menu 4.3.5.1) (0/2 mA corresponds to f
responds to f
max
Only single-pump operation is possible.
6.1.4 Operating modes of the installations
Normal operation of switchgears with frequency converter
(see Fig. 3)
In the case of switchgears with frequency converter, the
speed of the base-load pump is controlled in such a way that
the current controlled variable corresponds to the setpoint ➃
(setpoint/actual value comparison).
If there is no "External Off" signal and no fault, at least the base-
load pump runs at minimum speed. As power requirements
and
increase, the first response will be to raise the speed of the
base-load pump. If the required output cannot be covered by
this pump, then the control system will switch on a peak-load
pump or (in the event that demand continues to increase)
additional peak-load pumps. The peak-load pumps run at a
constant speed; the speed of the base-load pump is con-
trolled in each case by the setpoint ➆. If demand decreases to
such an extent that the controlling pump runs in its lowest per-
formance range and no peak-load pump is needed to cover
demand, then the base-load pump will be sped up briefly and
the peak-load pump will be switched off by the controller.
34
and f .
max
).
; 20 mA cor-
min