Johnson Controls SABROE Unisab III Control User Manual

manual zero =
length of spacer block
length of total capacity level
100%
Set the Mechanical zero in the picture Setup/Configuration/Compressor Block in the configura-
tion point:
Mechanical zero [No/Yes]
Manual zero 0.0%
The position transmitter is calibrated with the spacer block mounted and the Vi-slide in mini-
mum (0%).
3.8.6 Capacity error shutdown
If the slide cannot reach the position corresponding to a calculated or set zero point (i.e. a
positive read capacity) before the expiry of the timer T
cap.neg.
, the compressor will be stopped
with the alarm Capacity error.
The timer T
cap.neg.
is counting down every second by a factor between 1 and 90 depending on
the read negative capacity. Each time the slide moves above 0% read capacity, the timer will
be stopped. The timer is reset (set to the reset value) and is restarted once the slide moves
below -2% capacity.
The timer is set in the picture Setup/Timers/Timer setup in the timer Cap.Neg.
The reset value can be set in the interval of 60-20,000. The factory value is 5000. It is very
important that the timer has been set correctly. A value too low will result in the Capacity er-
ror shutdown. A value too high will make the compressor run with a negative capacity for too
long.
3.8.7 Configuration
To obtain a correct calculation of the zero point it is important that the compressor type and
swept volume have been entered correctly.
The swept volume of the compressor is determined on the basis of:
• Compressor type
• rpm (50/60 Hz)
• Male/female rotor
On SAB 202, Unisab III will automatically enter a swept volume value corresponding to the S
type with male rotor and a two-pole 50 Hz motor, i.e. 1229 m3/h. The correct swept volume
must be based on the number of revolutions of the compressor, i.e. 50/60 Hz supply, and
whether the compressor has male or female rotor drive:
SAB 202 SM/ 50 Hz, swept volume = 1229 m3/h
SAB 202 SM/ 60 Hz, swept volume = 1475 m3/h
SAB 202 SF/ 50 Hz, swept volume = 1843 m3/h
SAB 202 SF/ 60 Hz, swept volume = 2212 m3/h
SAB 202 LM/ 50 Hz, swept volume = 1590 m3/h
SAB 202 LM/ 60 Hz, swept volume = 1908 m3/h
SAB 202 LF/ 50 Hz, swept volume = 2385 m3/h
SAB 202 LF/ 60 Hz, swept volume = 2862 m3/h
The nominal swept volume at 50 Hz is stated on the compressor name plate.
Compressor control and surveillance
Engineering manual - Unisab III 1.10
001930 en 2014.09
137/319

Johnson Controls SABROE Unisab III Control Specifications

General

Brand	Johnson Controls
Model	SABROE Unisab III Control
Category	Control Systems
Language	English