CELLmatic 1502 – GSV/GSF
Issue: 2.1
User Manual
08.02.2004
Page 13 of 51
Thy
-
tronic
I/S – Bjørnevej 8c – DK 7700 Thisted – Tel.: +45 97982344 – Email.: [email protected]
In case of downward adjustment the slave will first be regulated to its minimum after which further downward
adjustment will be taking place at the master compressor.
When the master has reached "SLAVE STOP" (setp. U/ F3) the slave will stop, and adjustment will take place
at the master alone.
Signals to the slave about upward and downward regulation of capacity will be sent by the master compressor,
which at the same time will start the slave in the event of a cutout or voltage limitation.
Before a slave can start, in addition to a start signal, and a slave cap.-up signal from the master, the following
conditions must be fulfilled:
- Restart delay expired
- Reset of cutout, if any
- Slide valve at minimum (C-ABS < 15%)
When the slave is stopped the oil pump etc. will start as when stopping a master compressor.
In the event of operation with more slaves, slave no. 1 will work as a master for slave no. 2, and so on.
However, the suction pressure, registered by the "real" master, will be adjusted unless, for the master
compressor it is a question of remote control operation with external set point.
3. Remote control operation
The CELLmatic 1502 offers the possibility of running remote operation in 2 different ways:
I.
Remote control according to its own setpoint (select OPERATION/5).
The compressor must receive a start signal before it will run, and then it will react as if it was a
compressor preset for the "MASTER" operation, that is it runs according to its own setpoint.
Note:
The compressor will only start if suction pressure P
SUC
[°C] > (P
SUC SETP
+P
SUC START
) or
if brinetemperature T
BRINE
> (T
BRINE SETP
+T
BRINE START
) and will stop again if
P
SUC
[°C] < (P
SUC SETP
-P
SUC STOP
) or T
BRINE
< (T
BRINE
+
SETP
+T
BRINE STOP
)
II.
Remote control according to external setpoints (select OPERATION/4).
The compressor will start via an external signal and run according to external setpoints. The signals for
capacity up and down are sent from the main panel. The CELLmatic 1502 is converting these signals into
pulse interval signals for the solenoid valves of the compressor.
