CAUTION!
Material damage possible due to power surges
Should the pump be connected to the mains power
supply in parallel to inductive consumers (such as
solenoid valves, motors), inductive power surges
can damage the control when it is switched off.
– Provide the pump with its own contacts
(Phase) and supply with voltage via a contactor
relay or relay.
–
Should this not be possible, then switch a
varistor (part no. 710912) or an RC gate (0.22
µF/220 Ω, part no. 710802) in parallel.
CAUTION!
Bonding of the contacts of your switching relay
The high starting current can cause the contacts of
the on-site switching relay to bond together if the
mains voltage switches a solenoid metering pump
on and off in a process.
– Use the switching options offered by the
external socket to control the pump (functions:
Pause, Auxiliary frequency or Operating
modes: Contact, Batch, Analogue).
–
Use a starting current limiter if it is impossible
to avoid switching the pump on and off via a
relay.
Install the pump in line with best working practice and in
accordance with the operating instructions and applicable
regulations.
9.1
Supply voltage connector - power supply
WARNING!
Unexpected start-up is possible
The pump can start pumping and consequently
feed chemical may escape as soon as the pump is
connected to the mains/power supply.
– Avoid the escape of feed chemical.
–
If you have not done so, immediately press
[STOP/START]
or disconnect the pump from
the mains voltage e.g. using an Emergency
Stop switch.
– Refer to the material safety data sheet for your
feed chemical.
CAUTION!
If the pump is integrated into a system: Design the
system so that potential hazardous situations are
avoided by pumps starting up automatically subse‐
quent to unintended power interruptions.
Connect the pump to the power supply using the mains cable.
Installation, electrical
36
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