6
WHISPERFLO
®
VS and WHISPERFLO
®
VST Variable Speed Pump Installation and User’s Guide
External Control via Digital Inputs
When paired with either the RS-485 Automation Wiring Kit (P/N 356324z) or Digital Input Wiring Kit (discontinued), the
pump can be externally controlled by digital input signals.
Note: If the pump is manually stopped using the Start/Stop button, the pump will not run until the Start/
Stop button is pressed. If the Start/Stop LED is
illuminated, the pump is active and can be controlled
externally.
The communication cable provided with these kits
features a watertight connection that plugs into the Pump
Com Port (Figure 5 on page 5). The opposite end of
the cable has either 6 or 8 wires dened in Table 1.
A trigger signal is required to externally control the pump
via digital inputs. This required output signal can to be
provided in one of the following ways:
• By the pump drive. Refer to Using the Pump's
Output Signal.
• By an external low voltage signal. Refer to Using an
External Input Signal on page 7.
Using the Pump's Output Signal
1. Route the communication cable from the Pump Com Port (Figure 5 on page 5) to the control system wiring
compartment.
2. Ensure the cable reaches all necessary
terminals and cut to the necessary length.
3. Strip 3/4 in. (19 mm) of sheathing from the
communication cable.
4. Strip 1/2 in. (13 mm) of sheathing from all
24 AWG wires.
5. If using RS-485 Automation Wiring Kit
(P/N 356324z): Wire communication cable
to control system as shown in Figure 6A.
Note: Unused wires should be cut o
and terminated according to local and
national electrical codes.
If using Digital Input Wiring Kit
(discontinued): Wire communication cable
to control system as shown in Figure 6B.
6. Using the pump keypad, program the
pump's internal clock. Refer to Setting the
Clock and Pump Address on page 8.
7. Using the pump keypad, disable priming.
Refer to Priming on page 11.
8. When ready to start the pump, place the
pump into External Control Only mode.
Refer to External Control Only Mode on
page 7.
9. Plug the communication cable into the
Pump Com Port.
10. Press the Start/Stop button to start the
pump.
Signal Description Signal Range
Wire Color
RS-485
Kit
Digital
Input Kit
+5V Output for Digital Inputs 0-20mA Red Red
RS-485 A -7V to +12V Yellow -
RS-485 B -7V to +12V Green -
SPEED 1 Digital Input 0, 5-30V AC/DC White Green
SPEED 2 Digital Input 0, 5-30V AC/DC Blue Yellow
SPEED 3 Digital Input 0, 5-30V AC/DC Orange Orange
QUICK CLEAN Digital Input 0, 5-30V AC/DC Brown Brown
Common Ground 0V Black Black
Table 1
RELAY 1 RELAY 2RELAY 3RELAY 4
RELAY
LINE 1
LOAD 1
LOAD 2
LINE 2
POWER RELAY (DPST)
RED (R)
OUTPUT FOR D.I. TRIGGER
GREEN (G) SPEED 1 DIGITAL INPUT
YELLOW (Y) SPEED 2 DIGITAL INPUT
ORANGE (O)
SPEED 3 DIGITAL INPUT
BROWN (B) SPEED 4 DIGITAL INPUT
BLACK (K)GROUND
G
R
R
R
R
O
Y
B
K
RELAY 1 RELAY 2RELAY 3RELAY 4
RELAY
LINE 1
LOAD 1
LOAD 2
LINE 2
POWER RELAY (DPST)
W
R
R
R
R
O
Bl
B
K
RED (R)
OUTPUT FOR D.I. TRIGGER
WHITE (W) SPEED 1 DIGITAL INPUT
BLUE (Bl) SPEED 2 DIGITAL INPUT
ORANGE (O)
SPEED 3 DIGITAL INPUT
BROWN (B) SPEED 4 DIGITAL INPUT
BLACK (K)GROUND
GREEN (G)NOT USED
YELLOW (Y) NOT USED
Figure 6A
Figure 6B
Digital Input Wiring Kit
(discontinued)
RS-485 Automation Kit
(P/N 356324z)
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