ACH550 User’s Manual 43
Start-Up
Pump Alternation
This macro configures for pump alternation applications, usually used in booster
stations. To adjust/maintain pressure in the network, the speed of the one pump
changes according to a signal received from a pressure transducer. When the
variable speed pump reaches a maximum speed limit, auxiliary pumps start as
needed. When using process PID, see "General Considerations" on page 35. To use
more than one (the default) Auxiliary pump, see parameter group 81.
Parameters Changed Relative to HVAC Default
Parameter Value
Parameter Value
9902
APPLIC MACRO 7 (PUMPALTERN) 1609 START ENABLE 25 (DI5)
1105
REF1 MAX 62Hz/1860rpm 2208 EM DEC TIME 62HZ
1201 CONST SPEED SEL 0 (NOT SEL) 2202 ACCELER TIME 1 5.0 s
1401
RELAY OUTPUT 1 31 (PFA) 2203 DECELER TIME 1 5.0 s
1503
AO1 CONTENT MAX 62HZ 3207 SUPERV 3 PARAM 0103 (OUTPUT FREQ)
1508
AO2 CONTENT MIN 0.0% 4101 GAIN 1.0
1509
AO2 CONTENT MAX 100.0% 4102 INTEGRATION TIME 60.0 s
1601
RUN ENABLE 2 (DI2) 8123 PFA ENABLE 1 (ACTIVE)
1608
START ENABLE 10 (NOT SEL)
1SCR
2AI1
3AGND
410V
5AI2
6AGND
7AO1
8AO2
9AGND
10 24V
11 GND
12 DCOM1
13 DI1
14 DI2
15 DI3
16 DI4
17 DI5
18 DI6
19 RO1C
20 RO1A
21 RO1B
22 RO2C
23 RO2A
24 RO2B
25 RO3C
26 RO3A
27 RO3B
X1
+
mA
mA
External reference 0(2)…10 V or 0(4)…20 mA
Reference voltage 10 VDC
Output frequency: 0(4)…20 mA
Start/Stop: Activate to start drive
Run permissive: Deactivate to stop drive (P 1601)
Not configured
PFA interlock 1: Deactivate to stop drive (P 1608)
PFA interlock 2: Deactivate to stop drive (P 1609)
Relay output 1 (P 1401)
Default operation: PFA (starts lag pump)
Relay output 2 (P 1402)
Default operation: Running =>22 connected to 24
Relay output 3 (P 1403)
Default operation: Fault (-1) =>25 connected to 27
Output current: 0(4)…20 mA
Not configured
Analog input circuit common
PID feedback: 0(2)…10 V or 0(4)…20 mA
Analog output circuit common
Auxiliary voltage output +24 VDC
Common for DI return signals.
Digital input common for all
Signal cable shield (screen)
Analog input circuit common
(Fault => 25 connected to 26)
J1
AI1: 0(2)
…10 V
AI2: 0(4)
…20 mA
ON
ON
Jumper Settings
+
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