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COMBINED STEP CONTROLLER INSTALLATION / USER GUIDE
PRODUCT PART NUMBER
240V Combined Step Controller
FEATURES
•
Provides 8 volts-free normally-open relay contacts for
simple step control of up to 8 fans or compressor
stages
•
Sequential or cyclic switching sequence
•
Easily set switching delays
•
Six-minute interval between successive starts of any
compressor stage
•
Built-in exercise routines for fault-finding
Bit Switch Settings (Fig.1) (Shaded area = Switch position)
Select maximum
1
number of steps
2
3
Normal mode
4
Compressor mode
5
Normal Operation
6
Maximum number
Bit switch 1
of steps
1
OFF
2
ON
3
OFF
4
ON
5
OFF
6
ON
7
OFF
8
ON
COMMISSIONING
1.
Check all electrical connections (Fig. 2)
2.
Make sure that the controller software is ZCS
3.
Set the Bit Switches (Fig. 1)
4.
Switch the controller ON
5.
If you choose normal mode:
191180-ZCS
Off
On
See table Below
Cycle mode
Fans mode
Test mode
Bit switch 2
Bit switch 3
OFF
OFF
OFF
OFF
ON
OFF
ON
OFF
OFF
ON
OFF
ON
ON
ON
ON
ON
The first relay is switched on when there is a demand
increase (pressure switch UP), and will be the last to
be switched off when demand decreases (pressure
switch DOWN)
If you choose cycle mode:
The first relay is switched on when there is a demand
increase (pressure switch UP), and will be the first to
be switched off when demand decreases (pressure
switch DOWN)
6.
Set the two potentiometers to put a minimum time limit
(i.e. full anti-clockwise), between steps going up and
going down.
- In Fan mode, pot range = 0 to 180 seconds
- In Compressor mode, pot range 20 to 180 seconds
Note: In Compressor mode, same relay cannot
activate twice in six minutes.
7.
Faults ?...See 'Fault Finding'
FAULT FINDING
To exercise the step controller:
•
Switch OFF power to the controller
•
Set Bit Switches 1 to 5 OFF
•
Set Bit Switch 6 ON – for test mode
•
Switch ON power to the controller – Power LED 1
illuminates
•
By setting up the combinations of bit switch positions,
shown in the table you can energise each relay
•
Switch OFF power to the controller
•
If you are not going to check the timers, switch all Bit
Switches OFF now
Bit Switch
1
2
3
ON
OFF
OFF
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
TO CHECK THE TIMERS
Make sure Bit Switch 6 is ON
•
Switch OFF power to the controller
•
Switch ON power to the controller – Power LED
illuminates
•
Turn Timer 1 (DOWN potentiometer) slowly until Relay
LEDs 1, 2, 3 and 4 illuminate. This should occur
around the centre of the pot range.
Return the pot to the 20 seconds setting. Relay LEDs
1, 2, 3 and 4 will extinguish.
•
Turn Timer 2 (UP potentiometer) slowly until Relay
LEDs 5, 6, 7 and 8 illuminate. This should occur
around the centre of the pot range.
Return the pot to the 20 seconds setting. Relay LEDs
5, 6, 7 and 8 will extinguish.
•
Switch OFF power to the controller
•
After the test, remember to switch Bit Switch 6 OFF to
return to normal operation.
4
5
6
OFF
OFF
ON
OFF
OFF
ON
OFF
OFF
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
OFF
ON
Relay /
LED ON
1
2
3
4
5
6
7
8
ALL
NONE
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