Johnson Controls SABROE Unisab III Control, Engineering Manual

Page: 239 / 348

Engineering manual - UniSAB III 1.10.8
001930 en 2021.06
239/346
Set-up
6.5.11 Timer description - screw compressors
1. Start-start delay
States the number of seconds that must pass from one compressor start to the next. If the compressor
stops before the timer has counted down to 0, the timer will block restart.
1. For compressors configured with Rotatune=No, the timer can be set down to 600 seconds
2. For compressors configured with Rotatune=Yes, the timer can be set down to 60 seconds
2. Stop-start delay
States the number of seconds that must pass before the compressor can be restarted after stop. This
function is not used in
Manual mode.
3. Start delay
When UniSAB III is in Automatic or Remote , the compressor start will be delayed for the stated number
of seconds.
4. Stop delay
When UniSAB III is in Automatic or Remote and the compressor is below 5% slide stop position, the tim-
er will start counting down and stop the compressor at 0.
5. Suction ramp
This timer indicates how fast the compressor is allowed to lower its suction pressure 1 ° C. The function
is active as long as the compressor is working itself down to its normal working set point. When this has
been reached, the compressor will be regulated according to the set regulating values.
If the value is set at 0, this function is disabled.
6. Slide max.
At compressor stop the capacity slide will move towards minimum position. In case it fails to get below
5% within the set time, an error message will be issued.
If UniSAB III tries to move the slide during operation and the slide refuses to move within the set time,
an error message will appear.
7. Prelubrication
When starting compressors with prelubrication pumps, the prelubrication time is calculated from the time
when the oil float issues a signal.
1) For SAB 202, SAB Mk 3 and VMY Mk 3.
2) For SAB 163 Mk 1.
3) For SV 10/20, FV 10/20, SAB 110 SR/LR, SAB 128 HR and SAB 163 HR.
4) For SAB 283 Mk 1, SAB 355 Mk 1, GSV, RWF and SAB 330 B. (B is short for Booster, which can be
selected in the
Config. menu).
5) For SAB 330 HP. (HP means Booster = No).
6) For SAB 120
→ 151, SAB 193 → 355, SAB 193 H → 355 H, SAB 157 HR, SAB 273 S and SABflex prelu-
brication is not used.