Thermo Scientific Neslab Merlin M 75, Manual

Page: 84 / 107

3 - 2 Merlin
Chapter 3
Thermo Scientific
A male 9-pin D-connector is located on the rear of the chiller. The
connector is used for either 12 - 24VAC or 12 - 24VDC remote start/
stop; and as a status relay dry contact.
To start the chiller from a remote location apply the correct voltage to
pins 6 & 8. When the chiller is started by a remote start/stop voltage
on the controller will flash.
Once started remotely, stop the chiller by removing the applied voltage
from pins 6 & 8 or by pressing
on the local controller. To restart
remotely after stopping locally, remove and reapply the remote start
voltage to J101.
NOTE Enabling serial communications disables the remote start/stop
feature.

Should the chiller experience a high/low temperature warning/fault, a
reservoir level warning/fault, or a low pump flow warning/fault, the
status relay will de-energize.
The pin out information is:
Pin # Function Pin # Function
1 No Connection 6 Remote On +
2 Status, NO 7 RTD2B
3 Status, NC 8 Remote On -
4 RTD2A 9 No Connection
5 Status, Common
Hardware Mating Connector AMP Part# 745491-2 or equivalent
12 to 24 Volts DC ±10% maximum input current, 9ma.
12 to 24 Volts AC ±10% maximum input current, 5ma.
40 volts rms. continuous.
56 volts peak.
Rating for both normally open and normally closed status relay contacts
are: Maximum rated load - 1.0 Amp, 24 Volts AC/DC, resistive. Minimum
permissible load - 1 ma @ 5 VDC.
Remote Start/Stop
Remote Start Input
Absolute Maximum
Input Voltages