Bell & Gossett 193 TECHNOVAR VARIABLE SPEED PUMP CONTROLLER AND INTEGRATED AJUSTABLE FREQUENCY DRIVE - Manual (Page 38)

Operating Instruction
38
8.5 Multiple Pump - Constant Pressure and System Curve Compensation
When two, three or four Technovar controlled pumps are connected in a system, they can be
programmed to work together to maintain system pressure up to the maximum flow rate of
all pumps combined. As the first pump reaches its maximum speed and flow, the second will
automatically turn on (and so on). In addition, the sequence of the pump that will run first
(lead pump) can be automatically varied to reduce premature wear of any pump in the
system.
Hold the button for 3 seconds and the display changes to PASSWORD
0000
Password:
The password protection prevents untrained personal from accidentally changing of the base
settings:
Set ‘Password 0066’ by pressing or . PASSWORD
0066
You will now be able to access all of the alternate menus for all Technovar optional controls.
Press the button repeatedly until you reach
MODE:
Controller
Use and to change the setting to: MODE:
Multicontroller
MODE:
Controller:
If only one TECHNOVAR pump is in operation set the Controller for a stand alone controller
function. If more than one pump are working together, connected via the RS485 interface
(follow-up pump control), the Multicontroller must be set with the buttons or .
Synch. Controller:
The Synchronous Controller mode is working in the same way like the Multicontroller. The
only difference is, that all pumps in the multi pump system are running at the same
frequency.
Actuator:
The Actuator application is only used if you have an external controller and the Technovar is
used as a standard frequency converter. In the Actuator-Mode, the internal controller is shut
off, and the output frequency is proportional to the input signal (X1/2) Þ 4-20 mA = 0 -
f
max
. The frequency changes with the programmed ramps 1 and 2. The functions of low
water, thermal protection and external ON/OFF are still working.