CVHE-SB-32A 16
Problem 32: External Current Limit setpoint does not work.
1 Polarity must be (-, +) on the option module J7 11,12.
2 Isolated 2-10 VDC or 4-20 mA analog input is required. The 2-10 VDC and 4-20mA
corresponds to 40% to 120% RLA.
3 SW2,1: OFF for 2-10 VDC and ON for 4-20 mA.
4 Current limit setpoint source: set to external.
5 External current limit setpoint: set to installed.
6 Setpoint type: 2-10 VDC or 4-20 mA. Input type must be selected in the field start-up menu.
7 May need to install an isolation device (DC to DC converter),
8 Set to 2-10 VAC and hook an 8-volt battery to the input to verify the module works.
Problem 33: Fault Relay open on an AFD (air cooled adaptive frequency Drive)
Corrective action:
1 In machine configuration, check for correct starter type.
2 Wiring problem on the drive.
3 2U2 logic module problem.
4 Starter module.
Problem: 34 Fault relay open on Solid State Starter (SSS)
Corrective action:
1 Bad SSS fault input on Starter module. Replace Starter module.
2 Wiring problem to Starter module.
3 Program correct starter type in machine configuration.
4 Set the correct HPC setting in machine configuration.
5 Replace the HPC.
6 Replace the Circuit module. Faulty HPC input.
Problem 35: Free cooling (FC) operation problems.
Free cooling can be controlled manually from the front panel or automatically via a
on/off binary input (called external free cooling switch) at the Options module.
Corrective action:
1 Free cooling can be entered via an on/off switch manually at the front panel automatically via
an on/off switch input called external free cooling switch on the Options module J3 5,6
2 Free cooling cannot be entered if the unit is in the stop mode, it has to be entered from the
auto mode. You cannot use the Manual vane control in free cooling.
3 If the chiller is in auto, and not running the UCP2 will start the condenser water pump just as
with the powered cooling.
4 Once the condenser water pump is running and confirmed. The FC valve relays #1 & #2 and
the FC aux relay are all energized. If the FC valve-closed limit switches do not close within 3
minutes, a MMR diagnostic will be generated.
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