Version no. Description
1.0.9.0 A new screw compressor type, SAB 157HR, is introduced. It is a new short
high pressure screw compressor for heat pump (NH
3
) and CO
2
operation. De-
sign pressure is maximum 60 bar, it has no capacity slide but a relief valve for
unloading, for VSD control only i.e. 1000-6000 rpm, no volume slide but a
number of fixed Vi ratio.
An E-mail function is introduced in Unisab III. This function makes it possible
for Unisab III to report compressor operation and events, i.e. shutdowns or
alarms, for the central remote monitoring. With the E-mail function it is also
possible to enable Unisab III to send event mail to four User specified e-mail
addresses. Events can be e-mails in case of shutdown or alarm.
A Pay function has been introduced in Unisab III. In the future some new Uni-
sab III customer related functions will be blocked until they are activated by
entering a unique four digit password. This password can be acquired from
Sabroe sales.
A general maintenance module has been introduced in Unisab III. It gives
static service time information for screw and reciprocating compressors.
The COP (Coefficient of Performance) function is now available. To use the
COP function it must be configured. It requires the connection of a motor pow-
er meter and a flow meter. It can be used as an indication of the relative per-
formance of the compressor and therefore as a measure for the actual condi-
tion of the compressor. See the Unisab III COP manual.
For SMC/HPC/TSMC with frequency drive it is now possible to set the mini-
mum limit for "Motor rpm min 2" down to 500 rpm. The default setting re-
mains at 700 rpm.
For RecipRota, i.e. reciprocating compressors mounted with frequency drive, a
new and softer type of coupling is introduced for type CMO/HPO/TCMO. This
soft coupling type requires that the compressor is unloaded in a symmetrical
way. This restriction limits the number of unloading steps. As a consequence a
new unloading function with fewer unloading steps has been implemented in
Unisab III. See section 3.4.6.
The function Cap down blocked is now made configurable. The function must
be activated i.e. set to Yes, before it can be used. It is deactivated as default.
This change is made to avoid a conflict with the chiller configuration point Flow
Condenser, as they both use the same digital input, DI11. See the Engineering
manual, subsections 3.5.3. and 3.6.5.
The display contrast has been improved for F-keys and cursor. The contrast
compensation for temperature has been improved and Unisab III will now de-
tect the display version for automatic setting of optimum contrast value.
For Profibus Extended protocol the asynchronous part of the Measurements
database has been extended to contain the same number of data as found in
the Modbus TCP protocol.
Troubleshooting
Engineering manual - Unisab III 1.10
001930 en 2014.09
303/319
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