STP-301/451 Series Instruction Manual 
 
6-5
Installation 
6.1.3 Top Panel 
(22) VR1 Volume 
z  For setting the rated speed of the STP pump. 
This volume is normally made ineffective. (See Section 9.2, "Setting the Rated 
Speed.") 
 
(23) DSW-B Dip Switches 
z  For optional settings. 
Figure 6.3 shows the functions and the factory settings of the dip switches. 
 
<No.1 switch (Rated speed setting)> 
Rated speed can be changed by switching this switch "ON". (see Section 9.2, "Setting 
the Rated Speed") 
 
<No.4 switch (Remote input signal change)> 
It is valid with only the specification of remote connector CON4 (special accessory). 
The state of input terminal and connector can be changed by this switch "ON/OFF" 
operation. 
  Remote input signal 
No.4 switch 
Remote connector 
CON4 
Remote terminal block 
TB2 
ON Valid  Invalid 
OFF Invalid  Valid 
 
(22) (23)
Front Panel Side
8 7 6 5 4 3 2 1 ON
Not Used
Remote input signal changeover
Set Rated Speed
Expanded view of 
DSW-B switch
(setting at delivery)
"ON" only
with CON4.
Not Used
Not Used
Not Used
Not Used
Not Used
 
Figure 6.3    STP Control Unit Top Panel