Bell & Gossett 193 TECHNOVAR VARIABLE SPEED PUMP CONTROLLER AND INTEGRATED AJUSTABLE FREQUENCY DRIVE - Manual (Page 5)

Operating Instruction
5
1 Important safety instructions
In addition to the instructions contained in these operating instructions please pay
attention to universal safety and accident prevention regulations.
The TECHNOVAR drive head must be disconnected from the power supply before any work
can be carried out in the electrical or mechanical part of the system.
Installation, maintenance and repair work may only be carried out by trained, skilled and
qualified personnel.
Unauthorized modifications or changes to the system make all guarantees null and void.
When in operation, the motor can be stopped by remote control, whereby the drive head and
the motor remain under voltage. For safety reasons, the unit has to be disconnected from the
power supply when carrying out work on the machinery as locking out the equipment by
switching off the release mechanism or set value cannot prevent accidental starting of the
motor.
When the drive head is connected to power supply, the components of the
power unit as well as certain components of the master control unit are also
connected to the power supply.
Touching these components seriously endangers life !
Before removing the frequency inverter cover the system must be
disconnected from the power supply. After switching off the power supply
wait at least 5 minutes before starting work on or in the TECHNOVAR drive
head (the capacitors in the intermediate circuit have to be discharged by the
installed discharge resistors first).
Voltages of up to 800 volts are possible (if there are faults it can be higher)
All work, carried out when the frequency inverter is open, may only be
performed by qualified authorized staff.
Furthermore, care must be taken not to short circuit the neighbouring
components when connecting the external control wires and that open
cable ends which are not in use are isolated.