CELLmatic 1502 – GSV/GSF
Issue: 2.1
User Manual
08.02.2004
Page 12 of 51
Thy
-
tronic
I/S – Bjørnevej 8c – DK 7700 Thisted – Tel.: +45 97982344 – Email.: [email protected]
When the motor current exceeds the rated current (setp. C/F4) less 10 % the capacity up signals will be halved.
When the motor current exceeds the rated current less 3% the capacity up signals will be locked. When the
motor current exceeds max. ampere consumption (setp. I) the capacity will be adjusted downwards by forced
operation till rated current is reached again.
If the compressor receives signals to stop the following will take place:
- the oil pump will start (if it is OFF)
- a constant signal is set to the capacity-down solenoid valve
- a constant signal is set to the volume-down solenoid valve
and the compressor will not stop until minimum capacity (C-ABS > 15%) has been reached, but not later than
after the stopping delay which can be variably set under SETUP2/MENU 2. The pump will continue to run for
5 minutes, calculated from the start of run-down. The solenoid valves for the down-regulation of capacity and
volume ratio remain activated for 120 minutes, provided CABS is not less than 15%.
In most cases this will ensure that the compressor is ready for start.
2. Slave operation
Slave operation is selected by activating the F5/2 in the SETUP 1 picture.
If the compressor is to run as a slave, a master compressor must be available. The slave must be connected to
the master compressor either via a hardware connection or a network (Profibus). The master compressor can be
a compressor set for the operating form "MASTER" or "REMOTE".
The connection between master and slave is as shown below:
When the master compressor has reached 100% and there is still call for refrigeration the slave will receive a
signal to start after a preset delay (setp. U). The slave will now run up to its preset minimum setpoint C at the
same time as the master might be adjusted a little downwards to avoid excess capacity. If there is a call for
more refrigeration the master will first be adjusted up to 100%, and then the slave will be adjusted upwards.
