12 3 ak – JULABO SC 2500w Professional Series Recirculating Coolers User Manual
Page 65

Recirculating Cooler
65
ALARM
Alarm output
(for external alarm signal)
This potential-free change-over contact is activated in case of an alarm
when pins 2 and 3 are connected.
Switching capacity
max. 30 W / 40 VA
Switching voltage
max. 125 V
/
Switching current
max. 1 A
Functional description see page 57
1
2
3
AK
STAND-BY
STAND-BY
input
(for external emergency switch-off)
Pin assignment:
Pin
Signal
1
not
connected
2
5 V / DC
3
0 V
Functional description see page 6
1
2
3
4
5
6
REG+E-PROG
Programmer input / temperature recorder output
Pin
Signal
1 Voltage output
Channel 1
0 ... 10 V
2 Voltage output
Channel 2
0 ... 10 V
3 GND for outputs
0 V
4 Programmer input
EPROG
0 to 10 V / 0 to 20 mA
5 Current output
Channel 3
0 to 20 mA / 4 to 20 mA
6 GND for Progammer
0 V
Functional description see page 59
Control connector
Return flow safety device.
If the liquid levels in the recirculating cooler and the external system are
at different heights, overflowing must be prevented after the power has
been turned off. For this reason, solenoid valves for loop circuit can be
integrated in the loop circuit.
The control output is not powered in the OFF condition.
Output voltage: 230 V
/ max. 0.1 A