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Installation, electrical
9.1 HMI operating unit
36
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 sole‐
noid 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, Auxil‐
iary 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.
Connect the HMI to the CAN socket above the LEDs of the pump base if
the pump is operated via the HMI.
If the pump is operated without the HMI, the sealing cap supplied must be
plugged into the CAN socket above the LEDs of the pump base.
CAUTION!
Risk of short circuiting
A short circuit may occur in the pump if liquid penetrates
into the CAN socket.
–
Always plug a CAN plug or the sealing cap supplied
into the CAN socket.
CAUTION!
Danger of malfunction
Incorrect operation via the CAN bus will lead to malfunc‐
tions.
–
Do not connect any other control (e.g. DXCa) to the
CAN socket when operating with the HMI con‐
nected.
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