Bell & Gossett 193 TECHNOVAR VARIABLE SPEED PUMP CONTROLLER AND INTEGRATED AJUSTABLE FREQUENCY DRIVE - Manual (Page 57)

Operating Instruction
57
10.22.5 Source of required value
SOURCE REQ. VALUE
OFF
for selecting the address of the source of the
required value. Five adjustments are possible:
OFF, ADR1,ADR2, ADR3 and ADR4. If an additional (INT or EXT-ADC-I or EXT-ADC-U) input
is active, you must enter here the address where this input is connected.
At active Multicontroller or Synch. Controller there is shown the active value in a bracket in
the middle of the display. If the sign “#” is shown in the second line of the display, the pump
will work with a required value from a other pump in the multipump system. On the pump,
which is the source of the required value, there is no “#” shown.
Press on the Technovar to change to
10.22.6 Synchronous Control
If the synchronous control is active the activated pumps try to regulate the set pressure
together (all pumps run at the same frequency). The 2
nd pump starts, when the 1 st pump
reaches the release frequency (ENABLE SEQ: CONTR) The pumps will now attempt to
maintain pressure by running synchronously. The follow-up pump will than be stopped,
when both pump together run below the set SYNCHRON. LIMIT. This creates the hysteresis
effect.
S U B M E N U
Synch. Control
Press for about 3 seconds to enter the
submenu and the display changes to
10.22.6.1 Synchronous Limit
SYNCHRON. LIMIT
0,0 Hz
Frequency threshold adjustable between 0,0 Hz and
the set maximum frequency.
Switch off threshold of the first follow-up pump. The switch off thresholds of the other
pumps are each higher by the SYNCHRON-WINDOW.
This parameter is also used for the stop value for the external constant speed pump at
activated Simple Multicontroller in the parameter configuration relay.
Press on the Technovar to change to
10.22.6.2 Synchronous Window
SYNCHRON-WINDOW
2.0 Hz
Frequency offset
Adjustable between 0...10 Hz
Threshold lift for switching off the next follow-up pump.
Setting the Synchronous Threshold:
1. Set the desired set value and close the outgoing valves for no flow.
2. Start the first pump in JOG Mode (1st Window in the submenu), increase the
frequency, till you reach the required value. Read the frequency ( = f
0
)