added comments

tangostationcontrol/tangostationcontrol/devices/ccd.py

@@ -118,7 +118,7 @@ class CCD(opcua_device):
     def reset_hardware(self):
         """ Initialise the CCD hardware. """
 
-        # Cycle clock
+        # Cycle clock. Quickly toggling the heater should not cool the heater down too much.
         self.CCD_off()
         self.wait_attribute("CCDTR_translator_busy_R", False, self.CCD_On_Off_timeout)
         self.CCD_on()
@@ -131,7 +131,10 @@ class CCD(opcua_device):
                 logger.warning("CCD not locked, this may indicate the clock has not yet warmed up")
 
     def _disable_hardware(self):
-        """ Disable the CCD hardware. """
+        """ Disable the CCD hardware.
+        WARNING: The CCD contains a heater that takes about 15 minutes to fully heat up from a cold start.
+        This
+        """
 
         # Turn off the CCD
         self.CCD_off()