Installation
880 Operation Manual Issue 7 EMC INDUSTRIAL GROUP LTD Page 20 of 25
Power Supply
Connect supply phase to terminal L and supply neutral to terminal N.
Power requirement is 5VA maximum.
WARNING Before switching power on to controller, check supply voltage rating
shown on the back panel, is correct for your mains power supply.
Electrical Interference Suppression of Relay Outputs
Inductive loads, such as the heat contactor coil used to switch power to kiln ele-
ments, connected to any of the relay contacts must have a suppression capacitor
fitted across the coil.
This is to suppress the large back EMF randomly generated when switching off the
contactor.
The fast changing back EMF voltage can couple into the controllers wiring which
may crash the microcontroller causing an alarm, to or
(. See
Alarm List, page 15.
Use supplied suppression capacitor, RS Components Part Number 238-299 or an
equivalent connected across the heat contactor coil.
Warning Do not connect capacitor across output relay contacts.
If relay option card OP-1 is fitted any inductive loads connected to the outputs
should have suppression capacitors fitted.
Heat Relay
Link terminal 8 to supply phase, terminal L, and connect terminal 9 via the door in-
terlock micro switch to the contactor coil. The other end of the coil connects to neu-
tral.
The contacts close if the kiln temperature is lower than the Control Temperature by
more than 2°C any time the program is running other than when there is an alarm.
Heat Relay contacts are on terminals 8 and 9 and are rated 240Vac, 2 amp load.
Link terminal 8 to supply phase, terminal L, and connect terminal 9 via the door in-
terlock micro switch to the contactor coil. The other end of the coil connects to neu-
tral.
Heat Logic for Solid State Relay
Out 1 Logic signal (5V at 20mA max) are on terminals 11 and 12.
Terminal 11 is positive and terminal 12 is negative.
This output, which operates when heat is called for, can be used for connection to
solid-state relays.
Run Relay (Option)
Run Relay contacts are on terminals 16 and 17 and are rated at 240Vac, 2 amp
load.
When firing starts, the contacts close and remain closed (except during a power
failure or alarm) for the duration of the firing. At the end of firing the contacts open.
This output may be used as the master cut-off control switch in gas fired kilns.
Vent Relay (Option)
Vent Relay contacts are on terminals 18 and 19 and are rated at 240Vac, 2 amp
load.
When the kiln temperature exceeds the programmed value , the contacts close
to close the vent. The contacts will only open again to open the vent when the firing
has ended and the kiln temperature has dropped below the programmed value
.
Note At power on, the Vent is always open. When the RUN key is pressed
(or firing Auto Continues) the vent is opened, unless the current kiln
temperature has exceeded the temperature.
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