CT24 MCU
User Manual
38
9M02-7608-A001-EN
Version 2.0
6.2
The Controller Machine
The machine you are interfacing to may consist of single or multiple contactor panels, single or multiple manual
controls, and single or multiple control transformers etc. Notice that there is no common connection between relay
output contacts, allowing control of different power sources and combinations of AC and DC power.
Application of the normally open relay contacts is similar to wiring that is required for any control switch, such as a
pendant. Standard wiring practices should be observed. These can be found in the National Electrical Code and
in local codes that may apply for your area.
6.3
Control Transformer
The power required to operate a standard remote control system is 110-240 VAC, 50/60 Hertz, at less than 1 A.
The remote control system can
be connected to an existing control transformer if the transformer’s size permits;
otherwise, a control transformer must be supplied to provide the appropriate power for the remote control system.
Note:
The MCU motherboard is protected by a 1 A/240 VAC (POWER) fuse.
Using a separate control transformer helps by reducing chances of a power slump if other electrical components
connected to it fail. It can also be sized to allow installation of a utility outlet near the MCU for connection of a light
or test equipment.
6.4
Relay Outputs
Each output relay has at least one normally open (NO) contact which is available for wiring at the relay board
terminal block (TB). These contacts are rated for up to 5.0 A at 110
–240 VAC or 30 VDC.
Each output relay is completely independent of all other relays. There are no common connections between any
output contacts. This allows the connection of different power sources, AC and DC, to each of the separate
relays.
WARNING
WITH THE EXCEPTION OF THE TWO SAFETY RELAYS, THE FUNCTION RELAYS IN THE
MACHINE CONTROL UNIT (MCU) DO NOT HAVE INTEGRAL FUSING; IT IS THEREFORE
IMPERATIVE THAT THE INTERFACE CIRCUITRY INCORPORATE THE REQUIRED
OVERCURRENT PROTECTIVE DEVICES. THE PROTECTIVE DEVICES MAY BE INSTALLED
IN INDIVIDUAL RELAYS OR IN RELAY GROUPS, BUT IN NO CIRCUMSTANCES SHOULD
THE OVERCURRENT DEVICE RATING EXCEED THE MAXIMUM RELAY CURRENT RATING
OF 5 A.
REFER TO THE INSTALLATION DRAWINGS PROVIDED FOR GUIDANCE.
DAMAGE TO EQUIPMENT OR SERIOUS INJURY OR DEATH TO PERSONNEL MAY RESULT.
IT MUST BE FULLY UNDERSTOOD THAT CATTRON WILL NOT BE HELD LIABLE FOR
PERSONAL INJURY, DEATH, EQUIPMENT OR PROPERTY DAMAGE WHICH MAY ARISE
FROM IMPROPER INSTALLATION OF YOUR REMOTE CONTROL SYSTEM.
6.5
Mainline Circuit
The safety relay K0-M and K0-S outputs are special. They should always be connected to the mainline (ML)
contactor.
If a fault were to occur, the safety relays which control the mainline contactor would safely bring the equipment to
a stop. This makes the use of a mainline contactor mandatory for safe operation of this equipment; see
!
