Fan Arrangement; Fan Stages; Variable Speed Ventilation; Fan Motor Electrical Protection - Carrier 30RBM 160 Installation, Operation And Maintenance Instructions

11.12 - Fan arrangement

30RBM/30RBP
11
CKT A
30RBM/30RBP 360-400
12 12
11 11
CKT A
12
11
CKT A

11.13 - Fan stages

30RBM standard Circuit Stage 1 Stage 2
160 A EV11
B EV21
180-200-220-260 A EV11
EV21
B
300-330 A EV11
B EV31
360-400 A EV11
B EV31
430-470 A EV21
B EV31
520 A EV11
B EV31

11.14 - Variable speed ventilation

The variable speed drives on the fans are used to optimise the
efficiency of the unit depending on the conditions of use (air
temperature, circuit capacity) and hence improve the seasonal
efficiency (ESEER and SCOP).
All fans in the same refrigerant circuit are controlled by a single
variable speed drive.
Therefore, they operate together at the same rotational speed.
All variable-speed fans are controlled by the unit controller.
Each variable-speed fan is equipped with its own variable-speed
drive.
The speed is controlled independently for each refrigerating
circuit,
This rotation speed at full load or partial load for each circuit is
controlled by an algorithm that continuously optimises the
condensation temperature to obtain the best unit energy efficiency
44
160
22
21
CKT B
22 22
32 32
21 21 31 31
CKT B
30RBM/30RBP 520
22
32 42
21 31 41
CKT B
Stage 3
EV21+EV22
EV11+ EV12
EV21+ EV22
EV11 + EV12
EV31+EV21 EV31+EV21+EV32
EV11+ EV12 EV11 + EV12 + EV22
EV31+ EV32 EV31+ EV32 + EV21
EV21+EV11 EV21+EV11+EV22
EV31+EV41 EV31+EV41+EV32
EV11 + EV21 EV11 + EV21 + EV12
EV31 + EV41 EV31 + EV41 + EV32
30RBM/30RBP
180-200-220-260
12
22
11
21
CKT A CKT B
30RBM/30RBP 430-470
22
32
11
21 31
CKT A CKT B
Stage 4 Variable frequency drive on
30RBP
EV11
EV21+EV22
EV11+ EV12
EV21+ EV22
EV11 + EV12
EV31+EV21+EV32
EV11 + EV12 + EV22
EV31+ EV32 + EV21
EV21+EV11+EV22
EV31+EV41+EV32+EV42 EV31+EV41+EV32+EV42
EV11 + EV21 + EV12 + EV22 EV11 + EV21 + EV12 + EV22
EV31 + EV41 + EV32 + EV42 EV31 + EV41 + EV32 + EV42
(EER and COP) whatever the operating conditions.

11.15 - Fan motor electrical protection

The motors of a same circuit are electrically protected by the
variable frequency drive in case of short-circuit, locked rotor
or general overload.
Each variable frequency drive follows a variable current
characteristic, based on the frequency from 5 to 50 Hz and the
number of fans controlled.
In case of fan failure (e.g. motor disconnected) the variable
frequency drive will detect this problem and an alert will be
sent to the user interface.
Refer to the unit's control manual for the list of alarms.
30RBM/30RBP 300-330
12
32
11
21 31
CKT A CKT B
42
41
Variable frequency
drive on Option 28
EV11
EV21
EV11
EV21
EV11
EV31
EV11
EV31
EV21
EV31
EV11
EV31
Two-speed fan
on Options 28B
and 28C
EV11
EV21
EV11
EV21
EV11
EV31
EV11
EV31
EV21
EV31
EV11
EV31