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12. Control Outputs
This section is applicable to the
hydro
CHEM
(part number 111103), which is supplied with a
three-way control output cable (part number 130105).
12.1 Output Cable Connections
The three-way control output cable connections are as follows…
Colour
Function
Black
Common for all three outputs
White
Nutrient A output
Blue
Nutrient B output
Red
pH Adjustor output
12.2 Control Output Specifications
The control outputs on the
hydro
CHEM
are 24V DC at low current. They are provided to enable
the
hydro
CHEM
to switch external relays which in turn switch on the relevant pumps. Relays
should be selected according to the voltage and current loading requirements of the pumps to be
used.
Any mains power wiring to the relays and pumps must be carried out by a qualified electrician.
13. Password Security
The password security feature prevents unauthorised persons from accessing any of the menu
functions of the
hydro
CHEM
.
13.1 Enabling the Password Security function.
1. Select the Password menu (
→
→
F5:System
→
→
F1:Password
).
2. Select
F3:Enable Security & Enter Code
from the menu.
3. The
hydro
CHEM
now prompts you to enter a 4 digit password…
Enter NEW 4 digit access code : _
Press F1, F2, F3, F4, F5 to Enter code
Press any combination of 4 of the
to
keys. Any of the keys may be repeated as often as
you wish. You do not need to press
after pressing the 4th key.
4. The
hydro
CHEM
now prompts you to re-enter the password for verification…
Enter NEW 4 digit access code : _
Now Re-Enter for Verification
Re-enter the 4 digit password. You do not need to press
after pressing the 4th key.
5. The
hydro
CHEM
now confirms that Security Access is enabled before returning to the
Password menu.
