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3.4 Icon
Definitions
Symbol Publication
Description
IEC 417, No.5019
Protective Conductor Terminal
IEC 417, No. 5007
On (Supply)
IEC 417, No. 5008
Off (Supply)
ISO 3864, No. B.3.6
Caution, risk of electric shock
ISO 3864, No. B.3.1
Caution
3.5 Electrical
Installation
The various standard wiring options are shown in figure 2. Your WBL series controller will arrive from
the factory prewired or ready for hardwiring. Depending on your configuration of controller options, you
may be required to hardwire some or all of the input/output devices. Refer to figures 3 and 4 for circuit
board layout and wiring.
Notes:
1.
When wiring the conductivity electrode, it is critical to use shielded 24 AWG cable.
DO NOT
route the cable in the same conduit as any AC wiring. The shield must be terminated at the
controller earth ground only. Make sure to cut off the shield wire at the electrode and to ensure
that it does not touch the grounded junction box.
2.
When wiring the optional flow meter contactor input, the 4-20 mA output or a remote flow switch,
it is advisable to use stranded, shielded, twisted pair wire between 22-26 AWG. Shield should be
terminated at the controller ground stud (see figures 3 and 4).
3.
Always route low voltage (sensor) signals with at least 6” separation from AC voltage wiring.
CAUTION
1.
There are live circuits inside the controller even when the power switch on the front panel is in
the OFF position! The front panel must never be opened before power to the controller is
REMOVED!
If your controller is prewired, it is supplied with a 8 foot, 18 AWG power cord with USA
style plug. A tool (#1 Phillips driver) is required to open the front panel.
2.
When mounting the controller, make sure there is clear access to the disconnecting device!
3.
The electrical installation of the controller must be done by trained personnel only and
conform to all applicable National, State and Local codes!
4.
Proper grounding of this product is required. Any attempt to bypass the grounding will
compromise the safety of persons and property.
5.
Operating this product in a manner not specified by Walchem may impair the protection
provided by the equipment.
