TT-S4/D
1877E FEB 02
INSTRUCTION
INSTRUCTION
Fig 3
TTC25X
TTC40FX
TT-S4/D
8
9
14
15
19
10 - 2V DC in
+
0
20
21
13
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
22
23
24
19
20
21
Relay 1 out
Relay 2 out
Relay 4 out
Not connected
Relays 1-4 common in
Not connected
Not connected
Neutral
Not connected
Not connected
Supply
voltage
Relay 3 out
0 - 10V DC input
Signal conv. 10-2V DC in
Signal neutral
Not connected
0 - 10V DC output
Signal neutral
Not connected
Not connected
24V AC in
Not connected
Not connected
Not connected
Signal conv. 0-10V DC out
Function
On an increasing input signal TT-S4/D will first increase the 0 - 10V
output signal. If the power demand becomes so large that the output
signal would need to be larger than 10V, the TT-S4/D will activate
the first relay. The output is held at 0V for 10 seconds and is then
set to an output corresponding to the part of the output signal that
would have been larger than 10V.
In order to get the best control possible the TT-S4/D automatically
sets the amplification between the input signal and the output signal
to suit the maximum number of relay outputs used. At an input signal
of 10V the number of relays set on the rotary switch will be activated
and the output signal will be at 10V.
TT-S4/D will only increase or decrease the relay outputs one at a
time with a time delay of 10 seconds between steps. Change of
direction i.e. from increasing power demand to decreasing power
demand or vice versa is delayed 30 seconds to minimize the risk of
unwanted instability.
Test function
Turn off the supply voltage to TT-S4/D and set the rotary switch to
position 0. Set the Binary/Sequential switch to the position suited to
the heater on hand.
Reconnect the supply voltage.
All relays should now be deactivated and the output signal equal to
0V.
N.B.
It is normal for the LEDs to wink faintly even when they are
unactivated.
By twisting the rotary switch clockwise the relays are activated in
sequence and the output signal on terminal 19 will increase from 0
when the switch is in position 0, to 10V when the switch is in
position 15 for binary mode, or 4 and above for sequential mode.
N.B.
On completion of the test function:
Turn off the supply voltage to the TT-S4/D.
Set the switches to positions suitable for the installation.
Reconnect the supply voltage.
If this is not done the TT-S4/D will remain in testmode.
EMC emissions & immunity standards
This product conforms with the requirements of European EMC
standards CENELEC EN 50081-1 and EN 50082-1 and carries
the CE mark.
LVD
This product conforms with the requirements of European LVD
standards IEC 669-1 and IEC 669-2-1.