Switching Off The Machine; Exchanging The Cooling Liquid And Cleaning The Tank; Cooling Lubricant; Determining The Ph Value Of The Cooling Liquid With Test Strips - VHF N4+ Originalbetriebsanleitung

N4+ – Operation: Preparing jobs
7. Confirm the current message.
The machine is ready for operation.
6.3 Sw itching off the machine
Danger of an electric shock if
DANGER
unplugging the power cable
before switching off the machine
If you unplug the power cable while the main power
switch is still in "ON" position, residual voltage in the
power cable may cause you to suffer from an electric
shock.
Before unplugging the power cable, switch off the
machine at the main power switch.
To switch off the machine, do the following:
1. Ensure that the working chamber is clean.
2. Switch off the machine at the main power switch.
3. (Optional) Unplug the power cable.
4. (Optional) Switch off the main power switch of
your workstation / facility.
6.4 Exchanging the cooling liquid
and cleaning the tank
Damages caused by wet
NOTICE
machining with unsuitable
cooling liquid
Wet machining without suitable cooling liquid can
damage the machine, tools and blanks.
Before you execute a job, ensure that the cooling
liquid is clean and the liquid level is sufficient.
Only use cooling liquid that meets the requirements
listed below.
If you use a cooling lubricant: Only add the cooling
lubricant Tec Liquid Pro to the cooling liquid.
Exchange used cooling liquid according to the main-
tenance table. Clean the cooling liquid tank before
refilling it.
If you use a cleaning agent to clean the tank, ensure
that no residues of it remain in the tank.
The machine needs cooling liquid that meets the
following requirements:
Drinking water – for some blank types, you must
n
add cooling lubricant (see below)
No added chlorine
n
No distilled water
n
No carbonated water
n
Without sufficient cooling liquid in the tank, wet
machining is not possible. You can find the appropriate
interval in the maintenance table. Of course, you can
exchange the cooling liquid at any time.
You need to exchange the cooling liquid in the
following cases:
Every time you exchange the cooling liquid, you must
also clean the tank.
Before every job, you also have to check the strainer
basket and empty it if required.

6.4.1 Cooling lubricant

When processing titanium blanks:
6.4.2 Determining the pH value of the cool-
ing liquid w ith test strips
If you added cooling lubricant to the cooling liquid,
you need to check the pH value of the cooling liquid to
determine whether you need to exchange it.
Original Operating Instructions: N4+
Version: 12/16/2021
The liquid level lies below the min mark.
n
The change interval in the maintenance table has
n
been exceeded.
The cooling liquid is soiled.
n
In case of a strong odor from or a biofilm on the
n
cooling liquid.
If you use a cooling lubricant: The pH value is
n
below 9.
The cooling liquid tank is dishwasher-safe. If
you use a dishwasher, select a cleaning
program with a maximum temperature of 70 °C
(160 °F). To preserve the cooling liquid filter,
you can remove it and clean it by hand.
Add the cooling lubricant Tec Liquid Pro to the cool-
ing liquid. The mixing ratio is indicated on the bottle
label. Determine the pH value of the cooling liquid.
Determining the pH value of the cooling liquid with

test strips – see below
Tec Liquid Pro is available from customer
service.
Determine the pH value of the cooling liquid directly
after adding the cooling lubricant and when you
didn't use the machine for 2 days.
To determine the pH value of the cooling liquid with
test strips, do the following:
Test strips are available from customer service.
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