Table 6: PTC terminals
Terminals
Description
X1/7
PTC or thermal switch input
X1/8
PTC or thermal switch input (Ground)
6.6.2 Input for emergency basic operations
Terminals X1/20 and X1/21 are used to connect an external switch which forces (when
closed) Hydovar to perform a manual start-up till reaching the maximum frequency (fixed
speed) set by par. 245 "Maximum Frequency
Table 7: SL terminals
Terminals
Description
X1/20
External switch (SOLO RUN) input
X1/21
External switch (SOLO RUN) input (Ground)
6.6.3 Digital and analog I/O
Several terminals, from X1/1 to X1/24, are used to connect analog and digital I/Os to
correspondent input signals, most of them configurable by specific parameters.
Table 8: I/O terminals
Item
Terminals
Description
Comments
Sensor 1
X1/1
Power supply for external
sensor 1
24VDC,
Σ
max. 100mA
X1/2
Actual value current/voltage
input sensor 1
0-20mA / 4-20mA / 0-10
VDC / 2-10 VDC
X1/3
Ground for external sensor
1
GND, electronic ground (for
X1/2)
Sensor 2
X1/4
Power supply for external
sensor 2
24VDC,
Σ
max. 100mA
X1/5
Actual value current/voltage
input sensor 2
0-20mA / 4-20mA / 0-10
VDC / 2-10 VDC
X1/6
Ground for external sensor
2
GND, electronic ground (for
X1/5)
Auxiliary
X1/9
Auxiliary voltage supply
10VDC, max. 3mA
X1/10
Ground for auxiliary voltage
supply
GND, electronic ground (for
X1/9)
Digital Input
X1/14
Configurable digital input 1 Active low
X1/15
Ground for configurable
digital input 1
GND, electronic ground (for
X1/14)
Low water
X1/16
Low water input
Active low
X1/17
Ground for low water input GND, electronic ground (for
X1/16)
External ON/OFF
X1/18
External ON/OFF input
Active low
X1/19
Ground for external ON/OFF
input
GND, electronic ground (for
X1/18)
External fan (Not to be
used: only for Wall
Mounting kit connection!)
X1/22
External fan control
X1/23
Ground for external fan
control
GND, electronic ground (for
X1/22)
6 Electrical Installation
36
HVL 2.015-4.220 Installation, Operation, and Maintenance Manual
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