Operating instructions

52
CIRCUIT STAGE
LEGEND
Fig. 31 — Fan Staging (cont)
Operation
— The low ambient temperature head pressure con-
troller is pre-configured to operate from a 0 to 10 vdc analog
input signal present on terminals 3 (AIN+) and 4 (AIN–).
Jumpers between terminals 2 and 4 and terminals 5 and 8 (5
and 9 for 575-v drives) are required for proper operation. The
drive is enabled based on an increase in the analog input signal
above 0 vdc. Output is varied from 0 Hz to 60 Hz as the analog
signal increases from 0 vdc to 10 vdc. When the signal is at
0 vdc the drive holds the fan at 0 rpm. The head pressure con-
trol set point is not adjustable. The MBB determines the con-
trol set point as required.
Replacement
— If the controller is replaced the parameters in
Table 39 must be configured. See Fig. 32 and 33.
CIRCUIT
30XA400
A
Fan stage A12345678
Contactor # FC A1 FC A2 FC A3 FC A4 FC A5 FC A6
Fan position FM11 FM9 FM7 FM12 FM10 FM8
B
Fan stage B123456
Contactor # FC B1 FC B2 FC B3 FC B4 FC B5 FC B6
Fan position FM1 FM3 FM5 FM2 FM4 FM6
C
Fan stage C12345678
Contactor # FC C1 FC C2 FC C3 FC C4 FC C5 FC C6 FC C7 FC C8
Fan position FM19 FM17 FM15 FM13 FM20 FM18 FM16 FM14
30XA450, 500
A
Fan stage A12345678
Contactor # FC A1 FC A2 FC A3 FC A4 FC A5 FC A6 FC A7 FC A8
Fan position FM13 FM11 FM9 FM7 FM14 FM12 FM10 FM8
B
Fan stage B123456
Contactor # FC B1 FC B2 FC B3 FC B4 FC B5 FC B6
Fan position FM1 FM3 FM5 FM2 FM4 FM6
C
Fan stage C12345678
Contactor # FC C1 FC C2 FC C3 FC C4 FC C5 FC C6 FC C7 FC C8
Fan position FM21 FM19 FM17 FM15 FM22 FM20 FM18 FM16
FM1
FM2
FM3
FM4
COMP C
FM5
FM6
FM7
FM8
FM9
FM10
FM11
FM12
FM13
FM14
FM15
FM16
FM17
FM18
FM19
FM20
PEB
COMP
B
PEB A/B COMP A
FM1
FM2
FM3
FM4
COMP C
FM5
FM6
FM7
FM8
FM9
FM10
FM11
FM12
FM13
FM14
FM15
FM16
FM17
FM18
FM19
FM20
FM21
FM22
PEB C
COMP
B
PEB A/B COMP A
COMP — Compressor FM — Fan Motor
FC — Fan Contactor PEB — Power Electrical Box
T2
L3
L2
L1
T3
W
V
D
C
D
C
L
L1
N
L2
L3
+
-
U
T1
TO CONDENSER
FAN MOTOR
Fig. 32 — Siemens Low Ambient Temperature
Control Power Wiring
a30-4049
ON
1
2 3
4
9
8
7
6
5
DIN1
DIN2 DIN3
24V+
0V
AOUT+ AOUT- P+
N-
12 13 14 15
DIP Switch 2
50 / 60 Hz
kW / hp
ON = 60 Hz
RLB
RLC
10 11
10V+ 0V AIN+ AIN-
–
+
0-10 VDC SIGNAL FROM FAN BOARD
ENABLE
JUMPER
JUMPER
Fig. 33 — Siemens Low Ambient Temperature
Control Signal Wiring
a30-4230
a30-4219
a30-4220
a30-4221